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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Pluggable Edge Services Working Group of the IETF.

	Title		: HTTP adaptation with OPES
	Author(s)	: A. Rousskov, M. Stecher
	Filename	: draft-ietf-opes-http-00.txt
	Pages		: 17
	Date		: 2003-8-4
	
Open Pluggable Edge Services (OPES) framework documents several
application-agnostic mechanisms such as OPES tracing, OPES bypass,
and OPES callout protocol. This document binds those mechanisms to a
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From owner-ietf-openproxy@mail.imc.org  Thu Aug  7 17:20:24 2003
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Date: Thu, 07 Aug 2003 23:07:58 +0200
To: OPES WG <ietf-openproxy@imc.org>
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Subject: Re: draft-beck-opes-irml-03.txt
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Not much interest in my proposition in here about alternative IP :-) but 
interest taken in some potential financing places. We will see.

I just went across an interesting concept on the IMAA list. The problem is 
to support vernacular (real life, law consistent) LHS (left hand side) in 
e-mails. One idea could be to develop a meta data system.

1. I write my mails with a lot of additional data (Rich text)
2. An opes reduces it to standard presentation plus meta data
3. a possible OPES in front of the receiving mail server restores the rich 
text he receiving server can or want understand.

The rich text information (as in RTF vs ascii text) is optional:
- upper cases in the LHS or special characters
- classing  system shared between members of a group
- url of the author
- translated appendix
- etc...
... and anti spam verification.

This corresponds to the only want to make internet systems evolve : 
encapsulating them into added value layers.

Comments? I may have an application for a financing in a few months.
jfc



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Date: Thu, 7 Aug 2003 16:23:55 -0600
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From: "The Purple Streak, Hilarie Orman" <ho@alum.mit.edu>
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Subject: Re: draft-beck-opes-irml-03.txt
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Text markup and presentation seems like an end system application.  I can't
see any advantage to having it done as part of delivery.  It would make
a lot of sense to have the marked-up text available for translation into
several different formats (pdf, word, html) even after the initial delivery,
so it does not seem like an OPES application.

Anti-spam, though, seems like a good OPES application.  It involves delivery,
it involves using an existing protocol (SMTP) embedded inside another
protocol state machine, it only needs to be done once as part of message
delivery.

Hilarie


From owner-ietf-openproxy@mail.imc.org  Thu Aug  7 21:43:12 2003
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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: "The Purple Streak, Hilarie Orman" <ho@alum.mit.edu>, info@utel.net
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Subject: RE: draft-beck-opes-irml-03.txt
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------_=_NextPart_001_01C35D4B.9755F870
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Hilarie,
yes, I agree  with your observations.

Abbie


> -----Original Message-----
> From: The Purple Streak, Hilarie Orman [mailto:ho@alum.mit.edu] 
> Sent: Thursday, August 07, 2003 6:24 PM
> To: info@utel.net
> Cc: ietf-openproxy@imc.org
> Subject: Re: draft-beck-opes-irml-03.txt
> 
> 
> 
> Text markup and presentation seems like an end system 
> application.  I can't see any advantage to having it done as 
> part of delivery.  It would make a lot of sense to have the 
> marked-up text available for translation into several 
> different formats (pdf, word, html) even after the initial 
> delivery, so it does not seem like an OPES application.
> 
> Anti-spam, though, seems like a good OPES application.  It 
> involves delivery, it involves using an existing protocol 
> (SMTP) embedded inside another protocol state machine, it 
> only needs to be done once as part of message delivery.
> 
> Hilarie
> 

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<TITLE>RE: draft-beck-opes-irml-03.txt</TITLE>
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<P><FONT SIZE=2>Hilarie,</FONT>
<BR><FONT SIZE=2>yes, I agree&nbsp; with your observations.</FONT>
</P>

<P><FONT SIZE=2>Abbie</FONT>
</P>
<BR>

<P><FONT SIZE=2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=2>&gt; From: The Purple Streak, Hilarie Orman [<A HREF="mailto:ho@alum.mit.edu">mailto:ho@alum.mit.edu</A>] </FONT>
<BR><FONT SIZE=2>&gt; Sent: Thursday, August 07, 2003 6:24 PM</FONT>
<BR><FONT SIZE=2>&gt; To: info@utel.net</FONT>
<BR><FONT SIZE=2>&gt; Cc: ietf-openproxy@imc.org</FONT>
<BR><FONT SIZE=2>&gt; Subject: Re: draft-beck-opes-irml-03.txt</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Text markup and presentation seems like an end system </FONT>
<BR><FONT SIZE=2>&gt; application.&nbsp; I can't see any advantage to having it done as </FONT>
<BR><FONT SIZE=2>&gt; part of delivery.&nbsp; It would make a lot of sense to have the </FONT>
<BR><FONT SIZE=2>&gt; marked-up text available for translation into several </FONT>
<BR><FONT SIZE=2>&gt; different formats (pdf, word, html) even after the initial </FONT>
<BR><FONT SIZE=2>&gt; delivery, so it does not seem like an OPES application.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Anti-spam, though, seems like a good OPES application.&nbsp; It </FONT>
<BR><FONT SIZE=2>&gt; involves delivery, it involves using an existing protocol </FONT>
<BR><FONT SIZE=2>&gt; (SMTP) embedded inside another protocol state machine, it </FONT>
<BR><FONT SIZE=2>&gt; only needs to be done once as part of message delivery.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Hilarie</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
</P>

</BODY>
</HTML>
------_=_NextPart_001_01C35D4B.9755F870--


From owner-ietf-openproxy@mail.imc.org  Fri Aug  8 09:45:26 2003
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Date: Fri, 08 Aug 2003 15:31:49 +0200
To: "The Purple Streak, Hilarie Orman" <ho@alum.mit.edu>
From: jfcm <info@utel.net>
Subject: Re: draft-beck-opes-irml-03.txt
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At 00:23 08/08/03, The Purple Streak, Hilarie Orman wrote:
>Text markup and presentation seems like an end system application.  I can't
>see any advantage to having it done as part of delivery.  It would make
>a lot of sense to have the marked-up text available for translation into
>several different formats (pdf, word, html) even after the initial delivery,
>so it does not seem like an OPES application.

Unfortunately (fortunately?) this cannot be the case for three main reasons:

1. the support of the existing systems. Today we still have Bind 4 in 
operation on many name servers. We will still have current MUAs for a long.

2. this will protect the users interest as every user does not necessarily 
need a complex MUA able to support many features in addition to the today ones.

3. the IAB/IETF trend is to refuse the users demand in that area expressed 
by language groups such as Eurolinc (of which I Chair the WG-IDN). The 
demand is for Vernacular Names, ie names which are the ones used in real 
life (language, law, programs, documents, geography, culture, peoples 
names, etc.). This means for example the support of case-sensitive mailboxes.

In making their support an option that an OPES may filter out, we permit 
them to develop while keeping continuity

>Anti-spam, though, seems like a good OPES application.  It involves delivery,
>it involves using an existing protocol (SMTP) embedded inside another
>protocol state machine, it only needs to be done once as part of message
>delivery.

Anti-Spam as filtering needs to be odnne once as a part of the mesage 
delivery. But anti-spam by dialog between sender's and receiver's OPES 
through OCP is an interesting feature which may add to value added mail 
services. An example is an acknowledgement system. Mail system does not 
support any mail delivery reporting. Using frontal Mail Opes might permit 
it with a mail control tower  among a community. It could permit meta / 
common archiving too. etc.

jfc









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Hi,

since there were no comments, these minutes have been submitted as final.

-Markus

Markus Hofmann wrote:

> Hi,
> 
> below the draft minutes from the OPES meeting in Vienna. In the absence 
> of substantive comments, the minutes get filed on Monday, 8/4/03.
> 
> Thanks,
>   Markus
> 
> ==================================================================
> 
> Minutes of the 57th Vienna OPES WG.
> 
> CHAIRS: Markus Hofmann <hofmann@bell-labs.com>
> 
> Minutes by Dimitri Tombroff.
> 
> 
> 1 Introduction and General Status:
> ----------------------------------
> 
> Status of OPES documents: Initial versions of tracing/bypassing 
> (draft-ietf-opes-end-comm-00.txt) and OPES core protocol
> 
> (draft-ietf-opes-ocp-core-00.txt) have been published. An individual 
> submission about OCP/HTTP mapping has also been published,
> 
> and the group intendes to adopt this draft as WG document.
> 
> General comments from the chair:
> - WG needs more participants for reviewing drafts and brings in arguments.
> - WG needs additional focusing on tracing/bypassing issues.
> - WG is late with the rule language. Need expert contributors to start 
> this.
> 
> 
> 2 Work on "Tracing/Bypass" document [P. Knight]
> -----------------------------------------------
> 
> Main issues is to decide on is traceable in an OPES flow, how to do it, 
> and what are the requirements and privacy issues.
> 
> The WG approach is to use in-band tracing on a per message flow with the 
> following requirements:
> - an OPES system MUST be traceable
> - an OPES processor SHOULD be traceable
> - an OPES service  MAY be traceable.
> 
> question: this works only for application protocols that allow for 
> in-band signaling of meta information. How would the first
> 
> MUST apply to other application protocols?
> answer: At this point, it is assumed that the appplication protocol will 
> have to support in-band signaling, which is in-line
> 
> with the WG's charter to focus on HTTP. This issue should be mentioned 
> in the drafts.
> 
> question : what motivates the MUST, SHOULD, and MAY at three different 
> levels ?
> answer: if you have a chain of processor, it may be unecessary that each 
> processor adds a trace. One per domain is enough.
> 
> On 'How to support tracing', the chair noted that although the WG has so 
> far ruled out out-of-band notifications, more  input is
> 
> needed to confirm it is the correct approach. It was suggested that the 
> resulting discussion should be reflected in the
> 
> document(s).
> 
> On another issue, the WG needs to detail the definition of an "OPES 
> system".
> 
> 
> 3 OPES Core Callout Protocol presented [Martin Stecher]
> -------------------------------------------------------
> 
> The core OCP  was presented. This was a rather detailed presentation, 
> the remarks and questions were the following:
> 
> The chair pointed out that there are still many open issues and optional 
> mechanisms to discuss - just see the TBD section and
> 
> the sections marked with XXX in the drafts. If no one is supporting the 
> inclusion of currently open/optional mechanisms (e.g.
> 
> capability query) on the mailing list, they will be removed for the sake 
> of protocol simplicity.
> 
> Performance is of big concern, and the WG needs to show benefits of OCP 
> over ICAP.
> 
> It was noted that after long discussions about using BEEP, SOAP, or 
> HTTP, the consensus has been to move forward with a custom
> 
> tailored transport protocol for OCP, and see how it works. Progresses 
> have been mostly made on  OCP messages format.
> 
> The 'can you' and 'do you' set of messages might bring unecessary 
> complication. Some input is needed to check if they are
> 
> worthwhile.
> 
> question : Since OCP is defined by a BNF grammar, is or will a parser be 
> provided ?
> answer: none so far.
> 
> 
> 4 OCP Http Adaptation [Martin Stecher]
> --------------------------------------
> 
> The http adaptation was presented, as well as the status of prototype 
> callout servers by A. Rousskov and M. Stecher.
> 
> One issue was raised about HTTP keep-alive connections and HTTP/1.1 
> pipelining. The problem is that the callout server may have
> 
> to transform a keep-alive http reply into a closed reply, because it may 
> not be able to set the correct Content-Length http
> 
> header, nor use the chunked transfer encoding.
> 
> Having a callout generating closed http replies is bad because it breaks 
> two desirable http properties: keep-alive connections
> 
> and thus http pipelining (if any). It was also pointed out that it is 
> not clear if it's the callout server responsability or the
> 
> OPES processor responsability to handle such closing.
> 
> 
> 
> 5 OPES treatment of IAB Consideration [P. Knight]
> -------------------------------------------------
> 
> IAB considerations were discussed. The goal is to show that all IAB 
> considerations are addressed.
> Only IAB considerations are mentioned in this document that triggered 
> some remarks/questions during the meeting.
> 
> 5.0 IP layer Addressability
> 
> Comment: must be addressible at IP layer. Otherwise encryption will not 
> work.
> 
> 5.1 Notification:
> 
> As pointed out before, the tracing/notification issue is still at an 
> early stage. Following Remarks:
> - hit metering analogy may not be approriate here,
>   content providers might want at least some limited
>   help in the OPES case
> - (out-of-band) notification may be a problem for the
>   recipient if it must  handle a lots of notification
>   information. A solution (should notification be needed)
>   would be to perform aggregation. I.e send me a
>   notification every hour rather than for each message.
> 
> 5.2 Non-blocking:
> 
> OPES intermediaries MUST support a bypass feature. There is a clear open 
> issue if the OPES service is essential.
> 
> 5.3 Privacy.
> 
>  From the tracing information, the user can contact the OPES first node, 
> then ask its privacy policy.
> What is not clear nor explicitely stated here is that the first OPES 
> node is not necessarilly addressible. A statement like "at
> 
> least one trace per domain must identify one addressible node" is needed.
> 
> question : is there any relationship with the ALIAS WG wrt to 
> establishing a trust relationship with an intermediary.
> answer: OPES is application level while ALIAS deals with the transport 
> level.
> 
> 



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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: OPES Group <ietf-openproxy@imc.org>
Subject: [end points comm] OPES System
Date: Mon, 11 Aug 2003 10:13:31 -0400
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All,

As per the minutes of the 57th IETF, the work on draft-ietf-opes-end-comm-00
requires us to come up with a definition of an "OPES system".

The intend of this e-mail is to start a thread that comes to a conclusion
from the WG. This will be used in the -01 of the draft that will be comming
soon.


To start off the discussion, can we state that an OPES system is the
collection of entities that perform OPES transformations on a
request/responce within an OPES flow?

Other e-mail threads will be used to discuss the remainder of the points
that need to be addressed to finalize the draft.


Cheers,

Abbie



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<P><FONT SIZE=3D2>All,</FONT>
</P>

<P><FONT SIZE=3D2>As per the minutes of the 57th IETF, the work on =
draft-ietf-opes-end-comm-00 requires us to come up with a definition of =
an &quot;OPES system&quot;.</FONT></P>

<P><FONT SIZE=3D2>The intend of this e-mail is to start a thread that =
comes to a conclusion from the WG. This will be used in the -01 of the =
draft that will be comming soon.</FONT></P>
<BR>

<P><FONT SIZE=3D2>To start off the discussion, can we state that an =
OPES system is the collection of entities that perform OPES =
transformations on a request/responce within an OPES flow?</FONT></P>

<P><FONT SIZE=3D2>Other e-mail threads will be used to discuss the =
remainder of the points that need to be addressed to finalize the =
draft.</FONT></P>
<BR>

<P><FONT SIZE=3D2>Cheers,</FONT>
</P>

<P><FONT SIZE=3D2>Abbie</FONT>
</P>
<BR>

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Abbie Barbir wrote:

> To start off the discussion, can we state that an OPES system is the
> collection of entities that perform OPES transformations on a
> request/responce within an OPES flow?

Isn't there somewhere an assumption in the drafts that an "OPES 
System" describes OPES entities that are operated (or belong) to a 
single operatore/trustdomain/carrier?

Thanks,
   Markus



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Markisn

That is the main problem. We need a formal definition, since we refere to it
a lot in the draft.

Abbie


> -----Original Message-----
> From: Markus Hofmann [mailto:markus@mhof.com] 
> Sent: Monday, August 11, 2003 10:52 AM
> To: OPES Group
> Subject: Re: [end points comm] OPES System
> 
> 
> 
> Abbie Barbir wrote:
> 
> > To start off the discussion, can we state that an OPES 
> system is the 
> > collection of entities that perform OPES transformations on a 
> > request/responce within an OPES flow?
> 
> Isn't there somewhere an assumption in the drafts that an "OPES 
> System" describes OPES entities that are operated (or belong) to a 
> single operatore/trustdomain/carrier?
> 
> Thanks,
>    Markus
> 
> 

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<P><FONT SIZE=2>Markisn</FONT>
</P>

<P><FONT SIZE=2>That is the main problem. We need a formal definition, since we refere to it a lot in the draft.</FONT>
</P>

<P><FONT SIZE=2>Abbie</FONT>
</P>
<BR>

<P><FONT SIZE=2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=2>&gt; From: Markus Hofmann [<A HREF="mailto:markus@mhof.com">mailto:markus@mhof.com</A>] </FONT>
<BR><FONT SIZE=2>&gt; Sent: Monday, August 11, 2003 10:52 AM</FONT>
<BR><FONT SIZE=2>&gt; To: OPES Group</FONT>
<BR><FONT SIZE=2>&gt; Subject: Re: [end points comm] OPES System</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Abbie Barbir wrote:</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; To start off the discussion, can we state that an OPES </FONT>
<BR><FONT SIZE=2>&gt; system is the </FONT>
<BR><FONT SIZE=2>&gt; &gt; collection of entities that perform OPES transformations on a </FONT>
<BR><FONT SIZE=2>&gt; &gt; request/responce within an OPES flow?</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Isn't there somewhere an assumption in the drafts that an &quot;OPES </FONT>
<BR><FONT SIZE=2>&gt; System&quot; describes OPES entities that are operated (or belong) to a </FONT>
<BR><FONT SIZE=2>&gt; single operatore/trustdomain/carrier?</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Thanks,</FONT>
<BR><FONT SIZE=2>&gt;&nbsp;&nbsp;&nbsp; Markus</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
</P>

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From: Markus Hofmann <markus@mhof.com>
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Subject: Re: [end points comm] OPES System
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Abbie,

sure, so here's my understanding so far:

   An "OPES system" describes the collection of all OPES entities (i.e.
   OPES processors and callout servers) that are operated by a single
   provider (or, alternatively: ...within a single trust domain).

If this describes what an "OPES system" was meant to be, I somehow 
don't like the term too much. Maybe the term "OPES domain" would be 
appropriate?

-Markus



Abbie Barbir wrote:

> Markisn
> 
> That is the main problem. We need a formal definition, since we refere to it
> a lot in the draft.
> 
> Abbie
> 
> 
> 
>>-----Original Message-----
>>From: Markus Hofmann [mailto:markus@mhof.com] 
>>Sent: Monday, August 11, 2003 10:52 AM
>>To: OPES Group
>>Subject: Re: [end points comm] OPES System
>>
>>
>>
>>Abbie Barbir wrote:
>>
>>
>>>To start off the discussion, can we state that an OPES 
>>
>>system is the 
>>
>>>collection of entities that perform OPES transformations on a 
>>>request/responce within an OPES flow?
>>
>>Isn't there somewhere an assumption in the drafts that an "OPES 
>>System" describes OPES entities that are operated (or belong) to a 
>>single operatore/trustdomain/carrier?
>>
>>Thanks,
>>   Markus
>>
>>
> 
> 



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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: Markus Hofmann <markus@mhof.com>, OPES Group <ietf-openproxy@imc.org>
Subject: RE: [end points comm] OPES System
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Markus,

SO are we saying that the system is static or the OPES flow can be
dynamically decided (based on a user profile for eample)

ABbie


> -----Original Message-----
> From: Markus Hofmann [mailto:markus@mhof.com] 
> Sent: Monday, August 11, 2003 11:35 AM
> To: OPES Group
> Subject: Re: [end points comm] OPES System
> 
> 
> 
> Abbie,
> 
> sure, so here's my understanding so far:
> 
>    An "OPES system" describes the collection of all OPES 
> entities (i.e.
>    OPES processors and callout servers) that are operated by a single
>    provider (or, alternatively: ...within a single trust domain).
> 
> If this describes what an "OPES system" was meant to be, I somehow 
> don't like the term too much. Maybe the term "OPES domain" would be 
> appropriate?
> 
> -Markus
> 
> 
> 
> Abbie Barbir wrote:
> 
> > Markisn
> > 
> > That is the main problem. We need a formal definition, 
> since we refere 
> > to it a lot in the draft.
> > 
> > Abbie
> > 
> > 
> > 
> >>-----Original Message-----
> >>From: Markus Hofmann [mailto:markus@mhof.com]
> >>Sent: Monday, August 11, 2003 10:52 AM
> >>To: OPES Group
> >>Subject: Re: [end points comm] OPES System
> >>
> >>
> >>
> >>Abbie Barbir wrote:
> >>
> >>
> >>>To start off the discussion, can we state that an OPES
> >>
> >>system is the
> >>
> >>>collection of entities that perform OPES transformations on a
> >>>request/responce within an OPES flow?
> >>
> >>Isn't there somewhere an assumption in the drafts that an "OPES
> >>System" describes OPES entities that are operated (or belong) to a 
> >>single operatore/trustdomain/carrier?
> >>
> >>Thanks,
> >>   Markus
> >>
> >>
> > 
> > 
> 
> 

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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<TITLE>RE: [end points comm] OPES System</TITLE>
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<P><FONT SIZE=3D2>Markus,</FONT>
</P>

<P><FONT SIZE=3D2>SO are we saying that the system is static or the =
OPES flow can be dynamically decided (based on a user profile for =
eample)</FONT></P>

<P><FONT SIZE=3D2>ABbie</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=3D2>&gt; From: Markus Hofmann [<A =
HREF=3D"mailto:markus@mhof.com">mailto:markus@mhof.com</A>] </FONT>
<BR><FONT SIZE=3D2>&gt; Sent: Monday, August 11, 2003 11:35 AM</FONT>
<BR><FONT SIZE=3D2>&gt; To: OPES Group</FONT>
<BR><FONT SIZE=3D2>&gt; Subject: Re: [end points comm] OPES =
System</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Abbie,</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; sure, so here's my understanding so far:</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp; An &quot;OPES system&quot; =
describes the collection of all OPES </FONT>
<BR><FONT SIZE=3D2>&gt; entities (i.e.</FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp; OPES processors and callout =
servers) that are operated by a single</FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp; provider (or, alternatively: =
...within a single trust domain).</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; If this describes what an &quot;OPES =
system&quot; was meant to be, I somehow </FONT>
<BR><FONT SIZE=3D2>&gt; don't like the term too much. Maybe the term =
&quot;OPES domain&quot; would be </FONT>
<BR><FONT SIZE=3D2>&gt; appropriate?</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; -Markus</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Abbie Barbir wrote:</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; Markisn</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; That is the main problem. We need a formal =
definition, </FONT>
<BR><FONT SIZE=3D2>&gt; since we refere </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; to it a lot in the draft.</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; Abbie</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;From: Markus Hofmann [<A =
HREF=3D"mailto:markus@mhof.com">mailto:markus@mhof.com</A>]</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;Sent: Monday, August 11, 2003 10:52 =
AM</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;To: OPES Group</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;Subject: Re: [end points comm] OPES =
System</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;Abbie Barbir wrote:</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;&gt;To start off the discussion, can we =
state that an OPES</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;system is the</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;&gt;collection of entities that perform =
OPES transformations on a</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;&gt;request/responce within an OPES =
flow?</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;Isn't there somewhere an assumption in =
the drafts that an &quot;OPES</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;System&quot; describes OPES entities =
that are operated (or belong) to a </FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;single =
operatore/trustdomain/carrier?</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;Thanks,</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;&nbsp;&nbsp; Markus</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
</P>

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From owner-ietf-openproxy@mail.imc.org  Mon Aug 11 13:05:17 2003
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From: "The Purple Streak, Hilarie Orman" <ho@alum.mit.edu>
To: markus@mhof.com
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I think the concept of an "OPES system" being traceable, without
requiring each OPES processor to be traceable, is unsupportable.
It will not satisfy anyone, and it will lead to endless arguments
about what constitutes compliance.

Hilarie


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The Purple Streak, Hilarie Orman wrote:

> I think the concept of an "OPES system" being traceable, without
> requiring each OPES processor to be traceable, is unsupportable.
> It will not satisfy anyone, and it will lead to endless arguments
> about what constitutes compliance.

If I recall correctly, there were two arguments that lead to this concept:

(1) Carriers are typically hesitant to reveal information about their 
internal network infrastructure, i.e. they don't want to provide 
information (e.g. the IP address) about their internal network elements.

(2) OPES processors might be configured to use non-routable, private 
IP addresses inside a carrier's network. How would they be identified?

A user having problems/concerns would trace and contact the carrier 
who provided an OPES service (without tracing the exact OPES 
processor/callout server). It's up to the carrier to have maintained 
approriate internal detailed traces to find the answer to the 
customer's inquery.

Anyone any thoughts or comments on that issue? This is a very 
important topic and we must get WG consensus on it, so please post 
your views to the mailing list!

-Markus





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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: "The Purple Streak, Hilarie Orman" <ho@alum.mit.edu>, markus@mhof.com
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Hilarie,

each processor (i know we do not talk about chaining) or one in a chain.
what do we say about callout servers? (single or chain)

Abbie


> -----Original Message-----
> From: The Purple Streak, Hilarie Orman [mailto:ho@alum.mit.edu] 
> Sent: Monday, August 11, 2003 12:42 PM
> To: markus@mhof.com
> Cc: ietf-openproxy@imc.org
> Subject: Re: [end points comm] OPES System
> 
> 
> 
> I think the concept of an "OPES system" being traceable, 
> without requiring each OPES processor to be traceable, is 
> unsupportable. It will not satisfy anyone, and it will lead 
> to endless arguments about what constitutes compliance.
> 
> Hilarie
> 

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<P><FONT SIZE=2>Hilarie,</FONT>
</P>

<P><FONT SIZE=2>each processor (i know we do not talk about chaining) or one in a chain.</FONT>
<BR><FONT SIZE=2>what do we say about callout servers? (single or chain)</FONT>
</P>

<P><FONT SIZE=2>Abbie</FONT>
</P>
<BR>

<P><FONT SIZE=2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=2>&gt; From: The Purple Streak, Hilarie Orman [<A HREF="mailto:ho@alum.mit.edu">mailto:ho@alum.mit.edu</A>] </FONT>
<BR><FONT SIZE=2>&gt; Sent: Monday, August 11, 2003 12:42 PM</FONT>
<BR><FONT SIZE=2>&gt; To: markus@mhof.com</FONT>
<BR><FONT SIZE=2>&gt; Cc: ietf-openproxy@imc.org</FONT>
<BR><FONT SIZE=2>&gt; Subject: Re: [end points comm] OPES System</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; I think the concept of an &quot;OPES system&quot; being traceable, </FONT>
<BR><FONT SIZE=2>&gt; without requiring each OPES processor to be traceable, is </FONT>
<BR><FONT SIZE=2>&gt; unsupportable. It will not satisfy anyone, and it will lead </FONT>
<BR><FONT SIZE=2>&gt; to endless arguments about what constitutes compliance.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Hilarie</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
</P>

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Abbie Barbir wrote:

> SO are we saying that the system is static or the OPES flow can be
> dynamically decided (based on a user profile for eample)

I had assumed that an "OPES system" (or and "OPES domain") describes 
the collection of OPES entities that a single carrier operates. As 
such, this would be independent of any specific OPES flow, and 
therefor static in your definition. (Are we talking about the same 
thing here?)

Of course, every OPES flow can travel through different "OPES 
systems/domains".

-Markus



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well,

we need to clear these in the draft.
Action item for me.

abbie

> -----Original Message-----
> From: Markus Hofmann [mailto:markus@mhof.com] 
> Sent: Monday, August 11, 2003 1:41 PM
> To: OPES Group
> Subject: Re: [end points comm] OPES System
> 
> 
> 
> Abbie Barbir wrote:
> 
> > SO are we saying that the system is static or the OPES flow can be 
> > dynamically decided (based on a user profile for eample)
> 
> I had assumed that an "OPES system" (or and "OPES domain") describes 
> the collection of OPES entities that a single carrier operates. As 
> such, this would be independent of any specific OPES flow, and 
> therefor static in your definition. (Are we talking about the same 
> thing here?)
> 
> Of course, every OPES flow can travel through different "OPES 
> systems/domains".
> 
> -Markus
> 
> 

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<P><FONT SIZE=2>well,</FONT>
</P>

<P><FONT SIZE=2>we need to clear these in the draft.</FONT>
<BR><FONT SIZE=2>Action item for me.</FONT>
</P>

<P><FONT SIZE=2>abbie</FONT>
</P>

<P><FONT SIZE=2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=2>&gt; From: Markus Hofmann [<A HREF="mailto:markus@mhof.com">mailto:markus@mhof.com</A>] </FONT>
<BR><FONT SIZE=2>&gt; Sent: Monday, August 11, 2003 1:41 PM</FONT>
<BR><FONT SIZE=2>&gt; To: OPES Group</FONT>
<BR><FONT SIZE=2>&gt; Subject: Re: [end points comm] OPES System</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Abbie Barbir wrote:</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; SO are we saying that the system is static or the OPES flow can be </FONT>
<BR><FONT SIZE=2>&gt; &gt; dynamically decided (based on a user profile for eample)</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; I had assumed that an &quot;OPES system&quot; (or and &quot;OPES domain&quot;) describes </FONT>
<BR><FONT SIZE=2>&gt; the collection of OPES entities that a single carrier operates. As </FONT>
<BR><FONT SIZE=2>&gt; such, this would be independent of any specific OPES flow, and </FONT>
<BR><FONT SIZE=2>&gt; therefor static in your definition. (Are we talking about the same </FONT>
<BR><FONT SIZE=2>&gt; thing here?)</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Of course, every OPES flow can travel through different &quot;OPES </FONT>
<BR><FONT SIZE=2>&gt; systems/domains&quot;.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; -Markus</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
</P>

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At 17:34 11/08/03, Markus Hofmann wrote:
>Abbie,
>sure, so here's my understanding so far:
>
>   An "OPES system" describes the collection of all OPES entities (i.e.
>   OPES processors and callout servers) that are operated by a single
>   provider (or, alternatively: ...within a single trust domain).
>
>If this describes what an "OPES system" was meant to be, I somehow don't 
>like the term too much. Maybe the term "OPES domain" would be appropriate?

I do not see why who is providing what would structurally interfere with 
the definition of a system.

An OPES system is a system organized by someone to offer one or a set of 
edge services. If in so doing it uses thousand resources by a single or by 
thousand providers has no structural impact and should have no effect on 
the result.  However who the someone is (user, called service, third party, 
community) may have an influence on the global nature of the system.

An OPES domain maybe of interest to define the parts of an OPES system by a 
given operator, but we have to make clear that such an OPES domain may not 
be a sub-OPES system.

jfc





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What about this? I presuppose we define in here system and domain.

An OPES system is a system organized to permit its users to obtain a single 
or a coordinated set of open puggable edge services. Such a system can be 
statically and/or dynamically organized by its user, the community of its 
users, a host provider or any other third party. An OPES domain is the part 
of an OPES system belonging to a given operator. An OPES domain is not a 
sub-OPES system as it may need external ressources to provide services. 
OPES domains have no incidence  on the structure of an OPES system, but 
they may influence its organization for different reasons such as security, 
payment, quality of service, delivery parameters, etc. particularly in the 
case of  dynamicly prioritized organization and revamping choices.

jfc



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Subject: RE: [end points comm] OPES System
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Jfc,
good points. This is in-line with what I had in mine.

So what are the requirements that we should impose on an OPES system?

Abbie



> -----Original Message-----
> From: jfcm [mailto:info@utel.net] 
> Sent: Monday, August 11, 2003 3:40 PM
> To: Markus Hofmann; OPES Group
> Subject: Re: [end points comm] OPES System
> 
> 
> 
> At 17:34 11/08/03, Markus Hofmann wrote:
> >Abbie,
> >sure, so here's my understanding so far:
> >
> >   An "OPES system" describes the collection of all OPES 
> entities (i.e.
> >   OPES processors and callout servers) that are operated by a single
> >   provider (or, alternatively: ...within a single trust domain).
> >
> >If this describes what an "OPES system" was meant to be, I somehow 
> >don't
> >like the term too much. Maybe the term "OPES domain" would 
> be appropriate?
> 
> I do not see why who is providing what would structurally 
> interfere with 
> the definition of a system.
> 
> An OPES system is a system organized by someone to offer one 
> or a set of 
> edge services. If in so doing it uses thousand resources by a 
> single or by 
> thousand providers has no structural impact and should have 
> no effect on 
> the result.  However who the someone is (user, called 
> service, third party, 
> community) may have an influence on the global nature of the system.
> 
> An OPES domain maybe of interest to define the parts of an 
> OPES system by a 
> given operator, but we have to make clear that such an OPES 
> domain may not 
> be a sub-OPES system.
> 
> jfc
> 
> 
> 
> 

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<TITLE>RE: [end points comm] OPES System</TITLE>
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<P><FONT SIZE=2>Jfc,</FONT>
<BR><FONT SIZE=2>good points. This is in-line with what I had in mine.</FONT>
</P>

<P><FONT SIZE=2>So what are the requirements that we should impose on an OPES system?</FONT>
</P>

<P><FONT SIZE=2>Abbie</FONT>
</P>
<BR>
<BR>

<P><FONT SIZE=2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=2>&gt; From: jfcm [<A HREF="mailto:info@utel.net">mailto:info@utel.net</A>] </FONT>
<BR><FONT SIZE=2>&gt; Sent: Monday, August 11, 2003 3:40 PM</FONT>
<BR><FONT SIZE=2>&gt; To: Markus Hofmann; OPES Group</FONT>
<BR><FONT SIZE=2>&gt; Subject: Re: [end points comm] OPES System</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; At 17:34 11/08/03, Markus Hofmann wrote:</FONT>
<BR><FONT SIZE=2>&gt; &gt;Abbie,</FONT>
<BR><FONT SIZE=2>&gt; &gt;sure, so here's my understanding so far:</FONT>
<BR><FONT SIZE=2>&gt; &gt;</FONT>
<BR><FONT SIZE=2>&gt; &gt;&nbsp;&nbsp; An &quot;OPES system&quot; describes the collection of all OPES </FONT>
<BR><FONT SIZE=2>&gt; entities (i.e.</FONT>
<BR><FONT SIZE=2>&gt; &gt;&nbsp;&nbsp; OPES processors and callout servers) that are operated by a single</FONT>
<BR><FONT SIZE=2>&gt; &gt;&nbsp;&nbsp; provider (or, alternatively: ...within a single trust domain).</FONT>
<BR><FONT SIZE=2>&gt; &gt;</FONT>
<BR><FONT SIZE=2>&gt; &gt;If this describes what an &quot;OPES system&quot; was meant to be, I somehow </FONT>
<BR><FONT SIZE=2>&gt; &gt;don't</FONT>
<BR><FONT SIZE=2>&gt; &gt;like the term too much. Maybe the term &quot;OPES domain&quot; would </FONT>
<BR><FONT SIZE=2>&gt; be appropriate?</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; I do not see why who is providing what would structurally </FONT>
<BR><FONT SIZE=2>&gt; interfere with </FONT>
<BR><FONT SIZE=2>&gt; the definition of a system.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; An OPES system is a system organized by someone to offer one </FONT>
<BR><FONT SIZE=2>&gt; or a set of </FONT>
<BR><FONT SIZE=2>&gt; edge services. If in so doing it uses thousand resources by a </FONT>
<BR><FONT SIZE=2>&gt; single or by </FONT>
<BR><FONT SIZE=2>&gt; thousand providers has no structural impact and should have </FONT>
<BR><FONT SIZE=2>&gt; no effect on </FONT>
<BR><FONT SIZE=2>&gt; the result.&nbsp; However who the someone is (user, called </FONT>
<BR><FONT SIZE=2>&gt; service, third party, </FONT>
<BR><FONT SIZE=2>&gt; community) may have an influence on the global nature of the system.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; An OPES domain maybe of interest to define the parts of an </FONT>
<BR><FONT SIZE=2>&gt; OPES system by a </FONT>
<BR><FONT SIZE=2>&gt; given operator, but we have to make clear that such an OPES </FONT>
<BR><FONT SIZE=2>&gt; domain may not </FONT>
<BR><FONT SIZE=2>&gt; be a sub-OPES system.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; jfc</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
</P>

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jfcm wrote:

> I do not see why who is providing what would structurally interfere with 
> the definition of a system.
> 
> An OPES system is a system organized by someone to offer one or a set of 
> edge services. If in so doing it uses thousand resources by a single or 
> by thousand providers has no structural impact and should have no effect 
> on the result. 

In the context we talked about, it is important that the "OPES system" 
is operated by a single provider, or that all elements of the "OPES 
system" are in the same trust domain. As such, the notion of an "OPES 
domain" comes to mind.

Also, as my advisor used to say, the term "system" is typically used 
when it's not clear what it refers to... :) A "system" can be anything 
and nothing, so if we can come up with a more specific term...

-Markus



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jfcm wrote:

> An OPES system is a system organized to permit its users to obtain a 
> single or a coordinated set of open puggable edge services. Such a 
> system can be statically and/or dynamically organized by its user, the 
> community of its users, a host provider or any other third party. An 
> OPES domain is the part of an OPES system belonging to a given operator. 
> An OPES domain is not a sub-OPES system as it may need external 
> ressources to provide services. OPES domains have no incidence  on the 
> structure of an OPES system, but they may influence its organization for 
> different reasons such as security, payment, quality of service, 
> delivery parameters, etc. particularly in the case of  dynamicly 
> prioritized organization and revamping choices.

I basically agree, but I don't see the need to formally define the 
term "OPES system". If we've the notion of an OPES domain as indicated 
above - in which draft and where would we need the term "OPES system"?

Let's simply say that "An OPES domain describes all OPES entities 
operated by a single provider". I would assume that's all we need in 
the context we talked about.

Also, please keep in mind Hilarie's view on the need to identify every 
single OPES processor and post your thoughts to the list. If consensus 
would be that each single OPES processor needs to be identified, we 
might not even need the notion of an "OPES domain".

-Markus






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Very very strong objection to this.
- military forces in Iraq are a military system made to free Iraq by GW Bush
- UK milirary forces in Iraq are a Bristh domain of forces contributing to 
that system
- Polish miliratry forces could join the system in Irak at a latter stage.

In no way the US, the UK and the Polish domain can quailfy as the self 
sustainable military system that GW Bush deemed necessary to protect the 
world from Iraqi mass destruction weapons.

I just picked that controversial image because it will be clearer to 
everyone. And that every one will easily understand that there are many 
differences/gateays between US, UK , Polish military domains in terms of 
equipment, security, chains of commands, standards, languages, operation 
protocols, etc.

Defining OPES is like definining the Iraqi strategy. Defining the OPES 
system as definiing the way for the user (GWB) will organize the necessary 
resources. Talking of OPES domains is like defining the possible 
independent contributions to the OPES system.

jfc


On 15:59 12/08/03, Markus Hofmann said:
>jfcm wrote:
>
>>An OPES system is a system organized to permit its users to obtain a 
>>single or a coordinated set of open puggable edge services. Such a system 
>>can be statically and/or dynamically organized by its user, the community 
>>of its users, a host provider or any other third party. An OPES domain is 
>>the part of an OPES system belonging to a given operator. An OPES domain 
>>is not a sub-OPES system as it may need external ressources to provide 
>>services. OPES domains have no incidence  on the structure of an OPES 
>>system, but they may influence its organization for different reasons 
>>such as security, payment, quality of service, delivery parameters, etc. 
>>particularly in the case of  dynamicly prioritized organization and 
>>revamping choices.
>
>I basically agree, but I don't see the need to formally define the term 
>"OPES system". If we've the notion of an OPES domain as indicated above - 
>in which draft and where would we need the term "OPES system"?
>
>Let's simply say that "An OPES domain describes all OPES entities operated 
>by a single provider". I would assume that's all we need in the context we 
>talked about.
>
>Also, please keep in mind Hilarie's view on the need to identify every 
>single OPES processor and post your thoughts to the list. If consensus 
>would be that each single OPES processor needs to be identified, we might 
>not even need the notion of an "OPES domain".



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On Fri, 25 Jul 2003, Markus Hofmann wrote:

> Alex Rousskov wrote:
>
> > I will try to show that XML presents virtually no advantages
> > compared to a domain specific language and introduces significant
> > hurdles.
>
> I assume "domain specific language" implies a "custom/new/specific"
> language?

Yes (assuming there is not one available already). Please note that
proposed IRML is also a new domain specific language.

> If so, allow me to raise flag in that we should use existing
> approaches (e.g. XML or others) as long as they don't have serious
> disadvantages, rather than inventing everything ourselves.

It looks like I may have introduced a terminology/classification
problem. Rules Language can use XML or, say, UTF-8 to represent its
tokens. Both XML and UTF-8 are "existing approaches".

The main problem with XML is that in addition to providing lexical
tokens for the Rules Language, XML demands certain hierarchical
relationship and order between language statements. IMO, that
relationship and order are note appropriate for a good Rules Language
because they do not exist in the original Rules Manipulation domain.

In other words, it is not a question of reusing an existing encoding.
It is a question of using the right existing encoding.

Alex.



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Subject: property element in draft-beck-opes-irml-03
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I am confused by the "property" element.

   3.6.1   The "property" Element

   The "property" element represents a rule condition and MAY contain
   one or more other "property" elements and/or one or more elements
   representing rule actions, i.e. "execute" elements.

My interpretation of the above is that the "property" element is
defined as "rule condition" that may contain other rule conditions and
rule actions. In other words, property element is the rule itself:

	if "condition" then do "action"

This should be clarified. Either "property" is a condition or it is an
action. If it is a condition (logical expression), then why is it
called "property"? If it is both condition and action, then why it is
not called a "rule"?

Alex.


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On Mon, 30 Jun 2003, Andre Beck wrote:

> Alex Rousskov wrote:
>
> > 1) IRLM is closely tied to a very narrow interpretation of the
> >    OPES architecture. The language should focus on a more general
> >    (yet well-scoped) task of expressing a message adaptation rule:
> >
> > 	if "condition" then do "action";
> >
> >    The "condition" expression should be powerful enough to express
> >    a mixture of processing points, processor state, application
> >    message properties, and extensions. The draft artificially
> >    segregates, for example, processing points, from message
> >    properties, severely limiting expression power.
>
> I don't consider the processing point a rule condition. Rather, I
> believe it's a rule attribute as it specifies when a rule is to be
> processed. As such, I don't see how the current IRML design limits
> expression power. Can you think of a specific example that shows
> where IRML lacks expression power?

condition1 :=
	processing_point == 2 or
	processing_point == 5

condition2 :=
	message_headers contain "Connection" or
	message_headers contain "Proxy-Connection"

rule :=
	if condition1 and condition2 then do_something;

Is there a good way to express the above logic using irml-03? BTW, the
above example also illustrates (without details) how a UTF-8-based
rule language could express the desired logic.

Note that the use of processing_point is not really essential
(moreover, documenting specific processing points is not appropriate
for an application-agnostic rule language).  Similar examples can be
made with other attributes. For example,

...

conditionA :=
	condition1 and condition0;

conditionB :=
	condition2 and not condition0

rule :=
	if conditionA or conditionB then do_something;


While I was not technically accurate what I used the term "expression
power", I hope the above examples illustrate that proposed irml-03 does
not let us express the above logic in a
good/convenient/suitable/efficient "enough" form.

> > 2) IRML attempts to enforce rules authorship. IMO, the Rule
> >    Specification language must focus on specifying the rules, not
> >    trying to specify or enforce who has the right to submit or execute
> >    them. For example, imagine C or Java languages with constructs to
> >    specify/enforce software copyright. I believe that rights
> >    specification and enforcement requires different mechanisms from
> >    rules specification. Moreover, both mechanisms lack key features in
> >    the current draft.
>
> I am not sure IRML attempts to enforce rule authorship/authorization. It
> does allow rule authors to specify rule authorship/authorization, but
> how this is enforced is up to the OPES processor or whatever OPES
> element receives IRML rules.

The specs seem to enforce authorization (Section 4, IRML Rule
Processing):

   For each data transaction the rule processor on the intermediary
   located in the path between data consumers and data providers MUST
   process only those IRML rule sets that ...
   contain rule sets which have been authorized by either endpoint
   of the transaction.

> Generally, I agree with your statement, though.
>
> > 3) I doubt that efficient rule processing would be possible with IRML.
> >    The language provides no mechanisms to reuse groups of rules (e.g.,
> >    procedures or functions) or to reuse computation results (i.e.,
> >    variables). Without such mechanisms, a realistic IRML program will
> >    be slow. It will also be huge and difficult to manage.
>
> Well, we never envisioned that an OPES processor would actually
> process IRML rule files on the fly as it receives user
> requests/responses. Instead, we figured that there would be a
> separate offline process that receives IRML rule files from external
> sources, validates them and subsequently translates them into some
> internal, proprietary format optimized for efficient rule
> processing.

Sorry if I missed this very important assumption in the spec. It seems
to me that this assumption limits irml-03 applicability to
intermediaries with which content providers have a long-lasting and
mostly static relationship. IMO, the primary value of Rules Language
(from IETF point of view) would be to allow dynamic rule
interpretation and inclusion of rules with application message
metadata.

For example, if we are talking about HTTP adaptation, the content
provider should be able to say something like this using HTTP
response headers:

	OPES-Rule: if condition1 do apply_service1;

Does everybody agree that support of such dynamic and/or embedded
rules is out of scope?

> > 4) I question the choice of XML syntax. Rule specification is much
> >    closer to a program than it is to a static tree of configuration
> >    options. I believe that the history of languages used to express
> >    application routing, load balancing, and filtering decisions at
> >    intermediaries proves my point: while the industry has started with
> >    simple maps and tables, the application-level requirements forced
> >    implementors to support much more flexible rule programming. The
> >    choice of XML as IRLM syntax makes it very awkward to express
> >    anything that goes beyond a simple rule. IMO, XML must not be used
> >    as a programming language syntax.
>
> I don't think it's realistic to expect that OPES processors would be
> able to process whatever you can express with a full-fledged programming
> language just to determine which requests/responses need further OPES
> processing.

Neither do I. There is a lot of room between irml-03 and a
"full-fledged programming language".

> This would probably impose an unacceptable performance penalty on
> those transactions that don't need further processing. Also, I doubt
> that a service provider would let external rule authors specify
> complex rule logic that could use up any amount of processing power,
> e.g. through loops etc. For these reasons we decided to keep IRML
> rules very simple and XML seems to be a very suitable format to do
> just that.

Clearly, there is a trade-off between what the rules can do and how
much processing is needed to interpret them. IMO, there are many
useful enough cases that can be processed more efficiently than
irml-03 (due to its simplifications/limitations) allows. See examples
above.

> >    XML justification in the draft is "many publicly available parsers
> >    and editing tools can be used". This is a very weak argument
> >    because (a) getting XML tree parsed is only a minor step towards
> >    interpreting IRML and
>
> True, but would this second step by any easier if we used a different
> format?

Maybe not. That is exactly why this argument should not be used. All
reasonable language formats would require at most the
pre-interpretation expenses of irml-03.

> > (b) there are more XML-unaware editing tools
> >    than XML-aware editing tools.
>
> True, but then again non-XML formats would have the same problem, right?

Hard to say. There are more ASCII-aware editing tools than there are
XML-aware editing tools. It is a question of whether generic editing
tools can assist rules writing enough to justify a particular encoding
format. IMO, no, they cannot (and so this argument should not be
used).

Thanks,

Alex.


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On Tue, 12 Aug 2003, Markus Hofmann wrote:

> I don't see the need to formally define the term "OPES system". If
> we've the notion of an OPES domain as indicated above - in which
> draft and where would we need the term "OPES system"?

Tracing/bypass draft. We need to define either "OPES system" or "OPES
domain" as the primary traceable/addressable entity. OPES system is
not currently defined. OPES domain is semi-defined in
draft-ietf-opes-architecture-04.

> Let's simply say that "An OPES domain describes all OPES entities
> operated by a single provider". I would assume that's all we need in
> the context we talked about.

I have to disagree. If Disney distributes its content with the help of
Akamai, Akamai entities belong to the same OPES domain/system as
Disney entities but are not operated by Disney. In fact, from an end
user or trust point of view, Disney and Akamai are (should be)
indistinguishable in this case -- they form a single OPES
system/domain.

> Also, please keep in mind Hilarie's view on the need to identify
> every single OPES processor and post your thoughts to the list. If
> consensus would be that each single OPES processor needs to be
> identified, we might not even need the notion of an "OPES domain".

I think it is totally unrealistic to expect/require every single OPES
processor to be identified in a trace. Moreover, I see no practical
value of such trace for the other side (the side reading the trace).
Internal structure of an OPES system is that system internal matter.
Knowing internals does not help the other side.

Tracing and bypass requirements must be defined for OPES
systems/domains.


Here is where I would start:

	OPES system: OPES system is a set of OPES entities
	defined for a given application message. The formation of an
	OPES system is recursive: OPES system starts with either data
	provider or data consumer (for the given message); OPES system
	then includes any OPES entity trusted by (accepting authority
	from) an entity already in the OPES system. The trust and
	authority delegation is viewed in the context of the given
	application message. As implied by the above definition, some
	OPES entities in the system may not participate in the
	processing of a given message.

Or we can use the "coloring" trick from
draft-ietf-opes-architecture-04. Just make sure that the end
(provider/consumer) is included in the OPES domain/system and that the
definition is based on a given message.

The above definition puts both Disney and Akamai into one OPES system,
for a given application message they may process. Moreover, if Disney
uses both Akamai and Mirror Image (or whatever) for content
distribution, the distinction would be made on a per-message
(per-content) basis, which is the right thing to do because Akamai and
Mirror Image do not necessarily belong to the same OPES domain/system.

Alex.


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On Mon, 11 Aug 2003, The Purple Streak, Hilarie Orman wrote:

> I think the concept of an "OPES system" being traceable, without
> requiring each OPES processor to be traceable, is unsupportable.

What do you mean by "unsupportable"? From protocol and implementation
point of view it is much easier to trace larger things (a well-known
collection of entities) than every single entity in that collection.

> It will not satisfy anyone, and it will lead to endless arguments
> about what constitutes compliance.

Tracing OPES systems satisfies me :-). While I agree that endless
arguments about compliance are unavoidable, I do not think that
tracing individual system components will stop those arguments. To
start with, "OPES processor" is not currently defined (AFAIK).

Alex.


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Alex Rousskov wrote:

> Yes (assuming there is not one available already). Please note that
> proposed IRML is also a new domain specific language.

Yup, but the usage of XML, for example, allows to very easily and very 
quickly implement an IRML parser using exisitng XML parsers - you 
almost get it for free.

Sure, if there are other (or even more approriate) existing 
schemas/languages/etc., we need to discuss their suitability and 
decide on the most approriate one. All I'm saying is let's have a look 
at what's out there rather than always wanting to design our own new 
stuff from scratch... which I believe to understand you agree with.

> In other words, it is not a question of reusing an existing encoding.
> It is a question of using the right existing encoding.

Correct. Using XML was partially inspired by CPL (Call Processing 
Language), which is used for similar problems in the SIP area. We 
should learn from their experience - both positive and negative.

-Markus



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Alex Rousskov wrote:

> Tracing/bypass draft. We need to define either "OPES system" or "OPES
> domain" as the primary traceable/addressable entity.

That's exactly what I said - we need either one, but not both.

> I have to disagree. If Disney distributes its content with the help of
> Akamai, Akamai entities belong to the same OPES domain/system as
> Disney entities but are not operated by Disney. In fact, from an end
> user or trust point of view, Disney and Akamai are (should be)
> indistinguishable in this case -- they form a single OPES
> system/domain.

If Disney's (original) Web servers are operated by Akamai, they're 
part of the same OPES domain as Akamai entities. If they're not 
operated by Akamai, they do not belong to the same OPES domain.

I don't see yet why Disney and Akamai should be indistinguishable in 
the latter case. If something goes wrong on an OPES entity operated by 
Akamai, I've to turn to Akamai, if something goes wrong on a Disney 
server, I need to turn to Disney.

> Here is where I would start:
> 
> 	OPES system: OPES system is a set of OPES entities
> 	defined for a given application message. The formation of an
> 	OPES system is recursive: OPES system starts with either data
> 	provider or data consumer (for the given message); OPES system
> 	then includes any OPES entity trusted by (accepting authority
> 	from) an entity already in the OPES system. The trust and
> 	authority delegation is viewed in the context of the given
> 	application message. As implied by the above definition, some
> 	OPES entities in the system may not participate in the
> 	processing of a given message.

Hm... Assume a carrier A trusting carrier B. According to above 
definition, they both form an OPES system/domain. As such, they're 
identified by a single OPES trace entry. To whom would an end user 
turn if there're any problems?

I'm wondering whether - for tracing purposes - an OPES system/domain 
should be defined by trust boundaries or by operational boundaries.

-Markus



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On Wed, 13 Aug 2003, Markus Hofmann wrote:

> Alex Rousskov wrote:
>
> > Yes (assuming there is not one available already). Please note that
> > proposed IRML is also a new domain specific language.
>
> Yup, but the usage of XML, for example, allows to very easily and very
> quickly implement an IRML parser using exisitng XML parsers - you
> almost get it for free.

I believe this is a common misconception about XML. XML does not make
parsing much easier than any BNF-defined syntax. Just like there are
existing parsers for XML, there are existing parser-generators for
arbitrary BNFs (YACC, Spirit, etc.). Practical usefulness of either
for production interpreters and compilers is about the same.

> Sure, if there are other (or even more approriate) existing
> schemas/languages/etc., we need to discuss their suitability and
> decide on the most approriate one. All I'm saying is let's have a
> look at what's out there rather than always wanting to design our
> own new stuff from scratch... which I believe to understand you
> agree with.

Absolutely. XML parsers exist. BNF parser-generators exist. IRML
defines an XML DTD. It could use a BNF instead. Both approaches would
reuse existing facilities to a similar degree.

> Correct. Using XML was partially inspired by CPL (Call Processing
> Language), which is used for similar problems in the SIP area. We
> should learn from their experience - both positive and negative.

Interesting. I need to look CPL up. My comments are based, in part, on
experience with ACLs (Access Control Lists) languages and other
configuration issues for HTTP intermediaries and L2-7 switches.

Thanks,

Alex.



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From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES Group <ietf-openproxy@imc.org>
Subject: Re: [end points comm] OPES System
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On Wed, 13 Aug 2003, Markus Hofmann wrote:

> > I have to disagree. If Disney distributes its content with the
> > help of Akamai, Akamai entities belong to the same OPES
> > domain/system as Disney entities but are not operated by Disney.
> > In fact, from an end user or trust point of view, Disney and
> > Akamai are (should be) indistinguishable in this case -- they form
> > a single OPES system/domain.
>
> If Disney's (original) Web servers are operated by Akamai, they're
> part of the same OPES domain as Akamai entities. If they're not
> operated by Akamai, they do not belong to the same OPES domain.

The content you receive is produced _both_ by OPES entities operated
by Disney and OPES entities operated by Akamai. Each company operates
its own entities, and the two groups of entities form a single OPES
domain/system.

> I don't see yet why Disney and Akamai should be indistinguishable in
> the latter case. If something goes wrong on an OPES entity operated
> by Akamai, I've to turn to Akamai, if something goes wrong on a
> Disney server, I need to turn to Disney.

The point is that you both (a) do not know where exactly something
went wrong and (b) would very much prefer to have a single point of
contact. Imagine a rather typical situation when there are several
companies producing the final piece of content; as an end-user, you do
not want to be responsible for figuring out which company made a
mistake. Furthermore, imagine that the problem is in the _interaction_
between two OPES entities (i.e., each OPES entity is not at fault, but
OPES system is malfunctioning).

To summarize: One "end" does not want its internal organization to be
known to the outside world. The other "end" wants to have a single
point of contact/failure to troubleshoot. Tracing individual OPES
entities violates both preferences. Tracing OPES systems satisfies
both preferences.

>
> > Here is where I would start:
> >
> > 	OPES system: OPES system is a set of OPES entities
> > 	defined for a given application message. The formation of an
> > 	OPES system is recursive: OPES system starts with either data
> > 	provider or data consumer (for the given message); OPES system
> > 	then includes any OPES entity trusted by (accepting authority
> > 	from) an entity already in the OPES system. The trust and
> > 	authority delegation is viewed in the context of the given
> > 	application message. As implied by the above definition, some
> > 	OPES entities in the system may not participate in the
> > 	processing of a given message.
>
> Hm... Assume a carrier A trusting carrier B. According to above
> definition, they both form an OPES system/domain. As such, they're
> identified by a single OPES trace entry. To whom would an end user
> turn if there're any problems?

To whoever is identified in the OPES trace. It would be up to the OPES
system to decide what ID/contact info to put in the trace. Note that
we are talking about authorized adaptation of content not just
proxying/carrying of opaque data. In OPES world, A and B would have
some kind of agreement between them. The trace would reflect that
agreement in providing a single "responsible party". That party could
be A, B, or even C (some support outsourcing agency). That party would
be responsible for taking complaints, troubleshooting problems, and
defining privacy policy.

> I'm wondering whether - for tracing purposes - an OPES system/domain
> should be defined by trust boundaries or by operational boundaries.

Operational boundaries would be impossible to define clearly. Even if
we define them, there will be too many distinct operational entities
to manage. In OPES-compliant world, there should be no more than two
mandatory traceable entities: data producer system/domain and data
consumer system/domain.

AFAIK, the "end-to-end" principle dictates the same bipolar design and
prohibits mandatory exposure of internal organization within each
system: We do not want to create intermediaries (from
trust/authority/tracing point of view) -- we want two ends talking to
each other.

Alex.



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From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES Group <ietf-openproxy@imc.org>
Subject: Re: [end points comm] OPES System
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On Wed, 13 Aug 2003, Markus Hofmann wrote:

> Alex Rousskov wrote:
>
> > Here is where I would start:
> >
> > 	OPES system: OPES system is a set of OPES entities
> > 	defined for a given application message. The formation of an
> > 	OPES system is recursive: OPES system starts with either data
> > 	provider or data consumer (for the given message); OPES system
> > 	then includes any OPES entity trusted by (accepting authority
> > 	from) an entity already in the OPES system. The trust and
> > 	authority delegation is viewed in the context of the given
> > 	application message. As implied by the above definition, some
> > 	OPES entities in the system may not participate in the
> > 	processing of a given message.
>
> Hm... Assume a carrier A trusting carrier B. According to above
> definition, they both form an OPES system/domain. As such, they're
> identified by a single OPES trace entry. To whom would an end user
> turn if there're any problems?

To the [single] entity identified in the trace.

Now suppose there are two or more trace entries. To whom would an end
user turn if there're any problems?


A real-world illustration of the same problem is baggage handling by
airlines. When your checked-in baggage does not arrive with you at the
final destination, you are supposed to complain to a single carrier
only (the last airline, in this case). It is the responsibility of
that carrier to follow the global airline system/domain rules to find
your baggage and deliver it to you. Naturally, you would not normally
know exactly where your baggage have been, who lost it, and how it was
found.

OPES system implementations can adopt the same last-entity model if
they find it useful, but they do not have to. They may choose to
outsource OPES troubleshooting instead (for example).

Alex.



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Subject: RE: [end points comm] OPES System
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------_=_NextPart_001_01C361E0.54994DCC
Content-Type: text/plain

Alex,

Fully agree with you.

Airline example is the example that we should use. I think we should define
the OPES system in that fashion where there is only one accountable system .

Abbie



> -----Original Message-----
> From: Alex Rousskov [mailto:rousskov@measurement-factory.com] 
> Sent: Wednesday, August 13, 2003 4:45 PM
> To: OPES Group
> Subject: Re: [end points comm] OPES System
> 
> 
> 
> 
> On Wed, 13 Aug 2003, Markus Hofmann wrote:
> 
> > Alex Rousskov wrote:
> >
> > > Here is where I would start:
> > >
> > > 	OPES system: OPES system is a set of OPES entities
> > > 	defined for a given application message. The formation of an
> > > 	OPES system is recursive: OPES system starts with either data
> > > 	provider or data consumer (for the given message); OPES system
> > > 	then includes any OPES entity trusted by (accepting authority
> > > 	from) an entity already in the OPES system. The trust and
> > > 	authority delegation is viewed in the context of the given
> > > 	application message. As implied by the above definition, some
> > > 	OPES entities in the system may not participate in the
> > > 	processing of a given message.
> >
> > Hm... Assume a carrier A trusting carrier B. According to above 
> > definition, they both form an OPES system/domain. As such, they're 
> > identified by a single OPES trace entry. To whom would an end user 
> > turn if there're any problems?
> 
> To the [single] entity identified in the trace.
> 
> Now suppose there are two or more trace entries. To whom 
> would an end user turn if there're any problems?
> 
> 
> A real-world illustration of the same problem is baggage 
> handling by airlines. When your checked-in baggage does not 
> arrive with you at the final destination, you are supposed to 
> complain to a single carrier only (the last airline, in this 
> case). It is the responsibility of that carrier to follow the 
> global airline system/domain rules to find your baggage and 
> deliver it to you. Naturally, you would not normally know 
> exactly where your baggage have been, who lost it, and how it 
> was found.
> 
> OPES system implementations can adopt the same last-entity 
> model if they find it useful, but they do not have to. They 
> may choose to outsource OPES troubleshooting instead (for example).
> 
> Alex.
> 
> 

------_=_NextPart_001_01C361E0.54994DCC
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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charset=3Dus-ascii">
<META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
5.5.2656.31">
<TITLE>RE: [end points comm] OPES System</TITLE>
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<BODY>

<P><FONT SIZE=3D2>Alex,</FONT>
</P>

<P><FONT SIZE=3D2>Fully agree with you.</FONT>
</P>

<P><FONT SIZE=3D2>Airline example is the example that we should use. I =
think we should define the OPES system in that fashion where there is =
only one accountable system .</FONT></P>

<P><FONT SIZE=3D2>Abbie</FONT>
</P>
<BR>
<BR>

<P><FONT SIZE=3D2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=3D2>&gt; From: Alex Rousskov [<A =
HREF=3D"mailto:rousskov@measurement-factory.com">mailto:rousskov@measure=
ment-factory.com</A>] </FONT>
<BR><FONT SIZE=3D2>&gt; Sent: Wednesday, August 13, 2003 4:45 PM</FONT>
<BR><FONT SIZE=3D2>&gt; To: OPES Group</FONT>
<BR><FONT SIZE=3D2>&gt; Subject: Re: [end points comm] OPES =
System</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; On Wed, 13 Aug 2003, Markus Hofmann =
wrote:</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; Alex Rousskov wrote:</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; Here is where I would start:</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; &nbsp; OPES system: OPES system is a =
set of OPES entities</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; &nbsp; defined for a given =
application message. The formation of an</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; &nbsp; OPES system is recursive: OPES =
system starts with either data</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; &nbsp; provider or data consumer (for =
the given message); OPES system</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; &nbsp; then includes any OPES entity =
trusted by (accepting authority</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; &nbsp; from) an entity already in the =
OPES system. The trust and</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; &nbsp; authority delegation is viewed =
in the context of the given</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; &nbsp; application message. As =
implied by the above definition, some</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; &nbsp; OPES entities in the system =
may not participate in the</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; &nbsp; processing of a given =
message.</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; Hm... Assume a carrier A trusting carrier =
B. According to above </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; definition, they both form an OPES =
system/domain. As such, they're </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; identified by a single OPES trace entry. =
To whom would an end user </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; turn if there're any problems?</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; To the [single] entity identified in the =
trace.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Now suppose there are two or more trace =
entries. To whom </FONT>
<BR><FONT SIZE=3D2>&gt; would an end user turn if there're any =
problems?</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; A real-world illustration of the same problem =
is baggage </FONT>
<BR><FONT SIZE=3D2>&gt; handling by airlines. When your checked-in =
baggage does not </FONT>
<BR><FONT SIZE=3D2>&gt; arrive with you at the final destination, you =
are supposed to </FONT>
<BR><FONT SIZE=3D2>&gt; complain to a single carrier only (the last =
airline, in this </FONT>
<BR><FONT SIZE=3D2>&gt; case). It is the responsibility of that carrier =
to follow the </FONT>
<BR><FONT SIZE=3D2>&gt; global airline system/domain rules to find your =
baggage and </FONT>
<BR><FONT SIZE=3D2>&gt; deliver it to you. Naturally, you would not =
normally know </FONT>
<BR><FONT SIZE=3D2>&gt; exactly where your baggage have been, who lost =
it, and how it </FONT>
<BR><FONT SIZE=3D2>&gt; was found.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; OPES system implementations can adopt the same =
last-entity </FONT>
<BR><FONT SIZE=3D2>&gt; model if they find it useful, but they do not =
have to. They </FONT>
<BR><FONT SIZE=3D2>&gt; may choose to outsource OPES troubleshooting =
instead (for example).</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Alex.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
</P>

</BODY>
</HTML>
------_=_NextPart_001_01C361E0.54994DCC--


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Dear Markus,
please stop confusing system and domains!
Whatever the definition there are many needs to support. American is poor 
enough in terms not to reduce their number :-)

Intuitively domain relates to what belong to someone or which is stable 
enough with boarders
System relates to someting whch is assembled for a purpose and which may 
expand. And uses differnt domains. Ex. The moon belongs to the Earth Domain 
and the Earth participate to the Sun system.

Or will you support the SNS for system name system? :-)
jfc



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At 19:57 13/08/03, Alex Rousskov wrote:
>On Tue, 12 Aug 2003, Markus Hofmann wrote:
>Here is where I would start:
>
>         OPES system: OPES system is a set of OPES entities
>         defined for a given application message. The formation of an
>         OPES system is recursive: OPES system starts with either data
>         provider or data consumer (for the given message); OPES system
>         then includes any OPES entity trusted by (accepting authority
>         from) an entity already in the OPES system. The trust and
>         authority delegation is viewed in the context of the given
>         application message. As implied by the above definition, some
>         OPES entities in the system may not participate in the
>         processing of a given message.

OK for that definition with two provisions:

1. the recursiveness makes it potentially an illimited ectoplasm what I 
accept in principle if you read Open in that sense.

Nevertheless I prefer my own approach of saying that a system is organized 
by someone because of the differences in the system, usage and awareness 
depending on who organize it. This permits me to qualify as a boarderless 
system as most probably a structural bug?

2. I maintain the important interest of the notion of domain as belonging 
to an operator. Because of the practical influence in terms of rates, 
contracts, security, qos, etc. Sub-domains should be alluded to to show 
that what count is the parameter decided by an authority.

jfc




>Or we can use the "coloring" trick from
>draft-ietf-opes-architecture-04. Just make sure that the end
>(provider/consumer) is included in the OPES domain/system and that the
>definition is based on a given message.
>
>The above definition puts both Disney and Akamai into one OPES system,
>for a given application message they may process. Moreover, if Disney
>uses both Akamai and Mirror Image (or whatever) for content
>distribution, the distinction would be made on a per-message
>(per-content) basis, which is the right thing to do because Akamai and
>Mirror Image do not necessarily belong to the same OPES domain/system.
>
>Alex.
>
>
>
>
>---
>Incoming mail is certified Virus Free.
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On Wed, 13 Aug 2003, jfcm wrote:

> At 19:57 13/08/03, Alex Rousskov wrote:
> >On Tue, 12 Aug 2003, Markus Hofmann wrote:
> >Here is where I would start:
> >
> >         OPES system: OPES system is a set of OPES entities
> >         defined for a given application message. The formation of an
> >         OPES system is recursive: OPES system starts with either data
> >         provider or data consumer (for the given message); OPES system
> >         then includes any OPES entity trusted by (accepting authority
> >         from) an entity already in the OPES system. The trust and
> >         authority delegation is viewed in the context of the given
> >         application message. As implied by the above definition, some
> >         OPES entities in the system may not participate in the
> >         processing of a given message.
>
> OK for that definition with two provisions:
>
> 1. the recursiveness makes it potentially an illimited ectoplasm
> what I accept in principle if you read Open in that sense.

Not sure I follow. Are you objecting to potentially unlimited size of
the set?

> Nevertheless I prefer my own approach of saying that a system is
> organized by someone because of the differences in the system, usage
> and awareness depending on who organize it. This permits me to
> qualify as a boarderless system as most probably a structural bug?

IIRC, you proposed to define OPES system as "a system organized to
permit its users to obtain a set of open puggable edge services."
While that make sense, it allows for more than two OPES systems to
exist for a given application message being adopted. Thus, it
complicates tracing/bypass requirements and raises end-to-end/IAB
concerns.

My definition is essentially the same except a particular formation
mechanism is embedded to prevent more than two (one "provider" and one
"consumer") systems to co-exist. The two definitions can probably be
merged:

	OPES system: A set of OPES entities organized by (or on behalf
	of) either a data provider or data consumer for
	adaptation of a given message.

Alex.


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I think this discussion has become far too embroiled in business
practices and far too remote from protocols.  And I'd like to note that
today it is all too common to have airline baggage problems and be told
that your problems are due to TSA and there is NO way to either trace or
complain about lost items.

An OPES processor MUST support tracing.  You can set policy on who has
authorization to turn on tracing or to see the results, you can set
policy on granularity.  But until this group has defined the tracing
mechanism and told OPES implementors that the facility MUST be
present, the rest of it is irrelevant.

Hilarie





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From: Alex Rousskov <rousskov@measurement-factory.com>
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On Wed, 13 Aug 2003, The Purple Streak, Hilarie Orman wrote:

> An OPES processor MUST support tracing.  You can set policy on who
> has authorization to turn on tracing or to see the results, you can
> set policy on granularity.

If a given OPES processor implementation is always used deep inside an
OPES system, the above MUST would be an overkill. Moreover, violating
that MUST may not affect interoperability if sufficient tracing is
provided by other entities in the system. I agree that a
general-purpose processor must support tracing (because it may be used
in isolation), but it is wrong to require that from any OPES
processor. Only OPES systems MUST be traceable.

> But until this group has defined the tracing mechanism and told OPES
> implementors that the facility MUST be present, the rest of it is
> irrelevant.

The purpose of this thread is to identify what MUST be traceable. Some
(including myself) insist that only OPES system MUST be traceable
while smaller OPES entities SHOULD or MAY be traceable. Such approach
implies, of course, that a stand-alone, isolated OPES processor MUST
be traceable (because it represents an OPES system).

If you accept that point of view, we can move on to specific tracing
mechanisms (what should be included in the trace and how that
information should be encoded). Your comments regarding optional
tracing and tracing granularity make me thing that our positions are
not that different.

Alex.

P.S.

> And I'd like to note that today it is all too common to have airline
> baggage problems and be told that your problems are due to TSA and
> there is NO way to either trace or complain about lost items.

The above is a self-contradictory statement. If somebody is telling
you that your baggage problems are "due to TSA", then you found
somebody to complain about lost items to! Whether your complaint is
going to be effective is not relevant in the context of this thread.
The mechanism we discuss is not going to eliminate problems; It is
going to identify the responsible party (or partIES, in your version).


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My point about TSA is that there is no way to determine if items were
lost by TSA or the airline.  All you can do is to talk to the airline
and be told "we didn't lose it, it must be TSA".  That's not a
"trace", and TSA will say the airline is at fault.  We don't want a
protocol system with this kind of information loss.

Hilarie


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Date: Wed, 13 Aug 2003 22:54:11 -0400
From: Andre Beck <abeck@bell-labs.com>
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To: Alex Rousskov <rousskov@measurement-factory.com>
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Subject: Re: draft-beck-opes-irml-03.txt
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Alex Rousskov wrote:

> While I was not technically accurate what I used the term "expression
> power", I hope the above examples illustrate that proposed irml-03 does
> not let us express the above logic in a
> good/convenient/suitable/efficient "enough" form.

OK, I agree with that statement, though I still have doubts whether or 
not there is really a need to express rules that are so complex that it 
would be cumbersome to express them with IRML. Wouldn't most OPES 
services simply be triggered by matching a pattern against the requested 
URL? If I look at the classic OPES service examples like virus scanning, 
request filtering, ad insertion etc. I just don't see a need for rules 
with multiple, nested rule conditions.

Also, the reason why processing points in IRML are rule attributes and 
not rule conditions is that this allows rules to be grouped by 
processing point. That way, only rules relevant to a specific processing 
point need to be evaluated at any given time.

> The specs seem to enforce authorization (Section 4, IRML Rule
> Processing):
> 
>    For each data transaction the rule processor on the intermediary
>    located in the path between data consumers and data providers MUST
>    process only those IRML rule sets that ...
>    contain rule sets which have been authorized by either endpoint
>    of the transaction.

OK, that sentence should probably go to a separate document about rule 
authorization. I agree that IRML should neither specify how rules are 
authorized nor how the authorization is enforced.

> Sorry if I missed this very important assumption in the spec. It seems
> to me that this assumption limits irml-03 applicability to
> intermediaries with which content providers have a long-lasting and
> mostly static relationship. IMO, the primary value of Rules Language
> (from IETF point of view) would be to allow dynamic rule
> interpretation and inclusion of rules with application message
> metadata.
> 
> For example, if we are talking about HTTP adaptation, the content
> provider should be able to say something like this using HTTP
> response headers:
> 
> 	OPES-Rule: if condition1 do apply_service1;
> 
> Does everybody agree that support of such dynamic and/or embedded
> rules is out of scope?

That is indeed a good question. IRML certainly isn't designed to be used 
in application protocol headers. I would agree that an XML-based format 
would not be suitable for this type of dynamic rules.

> Clearly, there is a trade-off between what the rules can do and how
> much processing is needed to interpret them. IMO, there are many
> useful enough cases that can be processed more efficiently than
> irml-03 (due to its simplifications/limitations) allows. See examples
> above.

Again, I don't think OPES needs to or should support such rule 
constructs. Thus I think IRML's simplifications and limitations are a 
feature and not a bug. ;-)

> Hard to say. There are more ASCII-aware editing tools than there are
> XML-aware editing tools. It is a question of whether generic editing
> tools can assist rules writing enough to justify a particular encoding
> format. IMO, no, they cannot (and so this argument should not be
> used).

Well, a generic XML editor - if configured with the IRML DTD - can at 
least assist the author in that it can enforce the syntax and grammar of 
IRML modules.

-Andre





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At 00:20 14/08/03, Alex Rousskov wrote:
>On Wed, 13 Aug 2003, jfcm wrote:
> > At 19:57 13/08/03, Alex Rousskov wrote:
> > >On Tue, 12 Aug 2003, Markus Hofmann wrote:
> > >Here is where I would start:
> > >
> > >         OPES system: OPES system is a set of OPES entities
> > >         defined for a given application message. The formation of an
> > >         OPES system is recursive: OPES system starts with either data
> > >         provider or data consumer (for the given message); OPES system
> > >         then includes any OPES entity trusted by (accepting authority
> > >         from) an entity already in the OPES system. The trust and
> > >         authority delegation is viewed in the context of the given
> > >         application message. As implied by the above definition, some
> > >         OPES entities in the system may not participate in the
> > >         processing of a given message.
> >
> > OK for that definition with two provisions:
> >
> > 1. the recursiveness makes it potentially an illimited ectoplasm
> > what I accept in principle if you read Open in that sense.
>
>Not sure I follow. Are you objecting to potentially unlimited size of
>the set?

No. But I ask if this is what we want.

Your airfreight system is the best standard image. Passengers or luggages 
representing datagrams (however I do not understand your point about system 
tracability in another mail, I will address here, so we can see if we agree).

Let come back to your real world image and wording.
1. there is an air transport system you chose/you are proposed to travel 
(your definition below)
2. this system calls on different companies.

If a luggage is lost your last operator does not want to know where it has 
been lost, but who is reponsbile to find it back: the different involved 
companies domains of responsibility. The system MUST trace these domains 
however tiny they are (single machine). It COULD trace the different 
airports/processors but that may become confusing (they may use different 
wording, solutions) and useless (a company has no power within another 
company domain).

The question I rose was: if you accept "recursive" in the definition you 
imply that whatever the transit, as long as the luggage arrives, it is OK. 
I say this may rise a lot of questions because the luggage may this way 
legitimately transit throught places I do not want and we lose the 
possibility to say  there are transit bugs? or to restrict my luggage's 
travel and prefer them late than having transited in the USA, at risk of 
having been lost by the TSA. To keep with the discussed image.

> > Nevertheless I prefer my own approach of saying that a system is
> > organized by someone because of the differences in the system, usage
> > and awareness depending on who organize it. This permits me to
> > qualify as a boarderless system as most probably a structural bug?
>
>IIRC, you proposed to define OPES system as "a system organized to
>permit its users to obtain a set of open puggable edge services."
>While that make sense, it allows for more than two OPES systems to
>exist for a given application message being adopted. Thus, it
>complicates tracing/bypass requirements and raises end-to-end/IAB
>concerns.
>
>My definition is essentially the same except a particular formation
>mechanism is embedded to prevent more than two (one "provider" and one
>"consumer") systems to co-exist. The two definitions can probably be
>merged:
>
>         OPES system: A set of OPES entities organized by (or on behalf
>         of) either a data provider or data consumer for adaptation of a 
> given message.

Suits me. You may add "A set of OPES entities, parts of a single or of 
multiple OPES operators domains, organized ..."

jfc



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Markus,

From a carrier and/or ISP point of view, your arguments are completely re=
levant.
Indeed, the "OPES system" could give information about the services it=20
provides but nothing about the number of OPES processors, their IP=20
address, their specific version...
=20
I hope that this comment will help finding a "deployable" solution.
=20
Regards

Cedric=20
[ France Telecom R&D ]



-----Message d'origine-----
De : Markus Hofmann [mailto:markus@mhof.com]=20
Envoy=E9 : lundi 11 ao=FBt 2003 19:37
=C0 : ietf-openproxy@imc.org
Objet : Re: [end points comm] OPES System



The Purple Streak, Hilarie Orman wrote:

> I think the concept of an "OPES system" being traceable, without=20
> requiring each OPES processor to be traceable, is unsupportable. It=20
> will not satisfy anyone, and it will lead to endless arguments about=20
> what constitutes compliance.

If I recall correctly, there were two arguments that lead to this concept=
:

(1) Carriers are typically hesitant to reveal information about their=20
internal network infrastructure, i.e. they don't want to provide=20
information (e.g. the IP address) about their internal network elements.

(2) OPES processors might be configured to use non-routable, private=20
IP addresses inside a carrier's network. How would they be identified?

A user having problems/concerns would trace and contact the carrier=20
who provided an OPES service (without tracing the exact OPES=20
processor/callout server). It's up to the carrier to have maintained=20
approriate internal detailed traces to find the answer to the=20
customer's inquery.

Anyone any thoughts or comments on that issue? This is a very=20
important topic and we must get WG consensus on it, so please post=20
your views to the mailing list!

-Markus






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From: Alex Rousskov <rousskov@measurement-factory.com>
To: "The Purple Streak, Hilarie Orman" <ho@alum.mit.edu>
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On Wed, 13 Aug 2003, The Purple Streak, Hilarie Orman wrote:

> My point about TSA is that there is no way to determine if items were
> lost by TSA or the airline.

My point is that you should not care who lost the items. The only
thing you should care about is who you should complain to (and,
eventually, who will compensate you for your losses). If my bags are
lost, I got to the last airline on my itinerary. I do not care who
lost the bags. If the last airline cannot recover them on the spot, I
can file a formal claim with them and take them to small claims court
if needed.  Then it will be the airline responsibility to recover
their cost from TSA/government/whatever. This is how the system is
supposed to work according to, IIRC, Warshaw Convention (and usually
does).

> All you can do is to talk to the airline and be told "we didn't lose
> it, it must be TSA".  That's not a "trace", and TSA will say the
> airline is at fault.  We don't want a protocol system with this kind
> of information loss.

It is not information loss. It is information/responsibility
encapsulation.

You do not need to know more than "who is responsible". The
responsible party does not want you to know more than that they are
responsible (but the trace may embed more opaque-to-you information to
help them troubleshoot, of course; just like your bags have barcodes
that you cannot understand but that are useful to the airline).

Alex.


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Date: Thu, 14 Aug 2003 16:53:52 +0200
To: GOUTARD Cédric FTRD/DMI/CAE <cedric.goutard@francetelecom.com>,
        "Markus Hofmann" <markus@mhof.com>, <ietf-openproxy@imc.org>
From: jfcm <info@utel.net>
Subject: RE : [end points comm] OPES System
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C=E9dric,
I think we are all in agreement on that and Alex's standard comparison wi=
th=20
Arilines is the best image. Giving detailed infromation would be not only=
=20
undisclosure and security breaches, but it would be unecessary and confus=
ing.

The problem is the wording confusion that Markus seems to=20
introduce/maintain between operators cooperating OPES domains and=20
organizer's global OPES system.

If BNP jointly uses FT and UTEL (and may be others) OPES resources, the=20
only information I am ready to pass to you (and you to me I guess) are th=
at=20
the UTEL OPES domain was invovled, when, how (domain name, etc.). Yet if=20
BNP wants support we will describe their whole set-up as the BNP OPES sys=
tem.

A+
jfc

At 14:35 14/08/03, GOUTARD C=E9dric FTRD/DMI/CAE wrote:


>Markus,
>
> >From a carrier and/or ISP point of view, your arguments are completely=
=20
> relevant.
>Indeed, the "OPES system" could give information about the services it
>provides but nothing about the number of OPES processors, their IP
>address, their specific version...
>
>I hope that this comment will help finding a "deployable" solution.
>
>Regards
>
>Cedric
>[ France Telecom R&D ]
>
>
>
>-----Message d'origine-----
>De : Markus Hofmann [mailto:markus@mhof.com]
>Envoy=E9 : lundi 11 ao=FBt 2003 19:37
>=C0 : ietf-openproxy@imc.org
>Objet : Re: [end points comm] OPES System
>
>
>
>The Purple Streak, Hilarie Orman wrote:
>
> > I think the concept of an "OPES system" being traceable, without
> > requiring each OPES processor to be traceable, is unsupportable. It
> > will not satisfy anyone, and it will lead to endless arguments about
> > what constitutes compliance.
>
>If I recall correctly, there were two arguments that lead to this concep=
t:
>
>(1) Carriers are typically hesitant to reveal information about their
>internal network infrastructure, i.e. they don't want to provide
>information (e.g. the IP address) about their internal network elements.
>
>(2) OPES processors might be configured to use non-routable, private
>IP addresses inside a carrier's network. How would they be identified?
>
>A user having problems/concerns would trace and contact the carrier
>who provided an OPES service (without tracing the exact OPES
>processor/callout server). It's up to the carrier to have maintained
>approriate internal detailed traces to find the answer to the
>customer's inquery.
>
>Anyone any thoughts or comments on that issue? This is a very
>important topic and we must get WG consensus on it, so please post
>your views to the mailing list!
>
>-Markus
>
>
>
>
>
>
>
>
>---
>Incoming mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.507 / Virus Database: 304 - Release Date: 04/08/03



From owner-ietf-openproxy@mail.imc.org  Thu Aug 14 11:50:53 2003
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From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES WG <ietf-openproxy@imc.org>
Subject: Re: draft-beck-opes-irml-03.txt
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Andre,

	I think we narrowed our primary disagreement down to a
manageable size:

	- You envision IRML to be used to describe very basic
	  rules, occasionally distributed to OPES processors
	  using off-band mechanisms. You want the language
	  itself to make it difficult to describe complex
	  manipulations. IRML inspiration comes, in part,
	  from CPL which targets IP telephony needs.

	- I see the value of Rule Language in supporting
	  in-band distribution and dynamic interpretation.
	  I want the language to be compact and conveniently
	  powerful. I expect arrangements within a given
	  OPES system to limit the complexity of actual
	  expressions as/if needed. My inspiration comes,
	  in part, from trends in ACL (Access Control List)
	  specification languages used by HTTP proxies and
	  L2-7 switches.

I doubt the above differences can be resolved by a compromise. One
primary direction should be chosen by the working group. Am I the only
person disliking the general direction of irml-03?

Thanks,

Alex.


On Wed, 13 Aug 2003, Andre Beck wrote:

>
> Alex Rousskov wrote:
>
> > While I was not technically accurate what I used the term "expression
> > power", I hope the above examples illustrate that proposed irml-03 does
> > not let us express the above logic in a
> > good/convenient/suitable/efficient "enough" form.
>
> OK, I agree with that statement, though I still have doubts whether or
> not there is really a need to express rules that are so complex that it
> would be cumbersome to express them with IRML. Wouldn't most OPES
> services simply be triggered by matching a pattern against the requested
> URL? If I look at the classic OPES service examples like virus scanning,
> request filtering, ad insertion etc. I just don't see a need for rules
> with multiple, nested rule conditions.
>
> Also, the reason why processing points in IRML are rule attributes and
> not rule conditions is that this allows rules to be grouped by
> processing point. That way, only rules relevant to a specific processing
> point need to be evaluated at any given time.
>
> > The specs seem to enforce authorization (Section 4, IRML Rule
> > Processing):
> >
> >    For each data transaction the rule processor on the intermediary
> >    located in the path between data consumers and data providers MUST
> >    process only those IRML rule sets that ...
> >    contain rule sets which have been authorized by either endpoint
> >    of the transaction.
>
> OK, that sentence should probably go to a separate document about rule
> authorization. I agree that IRML should neither specify how rules are
> authorized nor how the authorization is enforced.
>
> > Sorry if I missed this very important assumption in the spec. It seems
> > to me that this assumption limits irml-03 applicability to
> > intermediaries with which content providers have a long-lasting and
> > mostly static relationship. IMO, the primary value of Rules Language
> > (from IETF point of view) would be to allow dynamic rule
> > interpretation and inclusion of rules with application message
> > metadata.
> >
> > For example, if we are talking about HTTP adaptation, the content
> > provider should be able to say something like this using HTTP
> > response headers:
> >
> > 	OPES-Rule: if condition1 do apply_service1;
> >
> > Does everybody agree that support of such dynamic and/or embedded
> > rules is out of scope?
>
> That is indeed a good question. IRML certainly isn't designed to be used
> in application protocol headers. I would agree that an XML-based format
> would not be suitable for this type of dynamic rules.
>
> > Clearly, there is a trade-off between what the rules can do and how
> > much processing is needed to interpret them. IMO, there are many
> > useful enough cases that can be processed more efficiently than
> > irml-03 (due to its simplifications/limitations) allows. See examples
> > above.
>
> Again, I don't think OPES needs to or should support such rule
> constructs. Thus I think IRML's simplifications and limitations are a
> feature and not a bug. ;-)
>
> > Hard to say. There are more ASCII-aware editing tools than there are
> > XML-aware editing tools. It is a question of whether generic editing
> > tools can assist rules writing enough to justify a particular encoding
> > format. IMO, no, they cannot (and so this argument should not be
> > used).
>
> Well, a generic XML editor - if configured with the IRML DTD - can at
> least assist the author in that it can enforce the syntax and grammar of
> IRML modules.
>
> -Andre
>
>
>
>


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Date: Thu, 14 Aug 2003 09:37:12 -0600 (MDT)
From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES WG <ietf-openproxy@imc.org>
Subject: processing points in draft-beck-opes-irml-03
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Is the concept of a "processing point" application-agnostic? If it is
application-specific, it should be removed from the
application-agnostic spec (draft-beck-opes-irml-03).

If we believe that every application protocol has some "processing
points", then the definition of HTTP-specific points should probably
be moved from draft-beck-opes-irml-03 to an HTTP binding for IRML. It
may also be more appropriate to migrate from numbers to tokens/strings
when describing application-specific points.

Alex.


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Date: Thu, 14 Aug 2003 10:59:29 -0600
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From: "The Purple Streak, Hilarie Orman" <ho@alum.mit.edu>
To: rousskov@measurement-factory.com
Cc: ietf-openproxy@imc.org
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Airlines have no responsibility or ability to recover passenger items from
government inspectors.  Don't repeat this mistake in designing protocols.

OPES processors MUST support tracing.

Hilarie


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From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES WG <ietf-openproxy@imc.org>
Subject: RE: [end points comm] OPES System
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On Thu, 14 Aug 2003, The Purple Streak, Hilarie Orman wrote:

> Airlines have no responsibility or ability to recover passenger
> items from government inspectors.  Don't repeat this mistake in
> designing protocols.

I do not think we are repeating any mistakes yet. Government
inspectors are, apparently, outside of the airline equivalent of the
OPES system and, hence, are not in the scope of this discussion.
According to your comments, they are similar to a "transparent" proxy
adapting traffic without either end authorization; we do not consider
such entities because we cannot regulate them. We only consider
entities that want to be called OPES entities and want to obey OPES
rules.

> OPES processors MUST support tracing.

We are not discussing what OPES processors must support. We are
discussing what OPES entities MUST be represented in any OPES trace.
IMO, only OPES systems MUST be represented.

Alex.


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Alex,
Hilarie point was correct and I think your response is final.

At 16:51 14/08/03, Alex Rousskov wrote:
>On Wed, 13 Aug 2003, The Purple Streak, Hilarie Orman wrote:
>
> > My point about TSA is that there is no way to determine if items were
> > lost by TSA or the airline.
>
>My point is that you should not care who lost the items. The only
>thing you should care about is who you should complain to (and,
>eventually, who will compensate you for your losses).

True as a passenger. But the Airline needs to know it (and probably to be 
able to document it a lot?). So the trace MUST tell it.

>It is not information loss. It is information/responsibility encapsulation.
>You do not need to know more than "who is responsible". The
>responsible party does not want you to know more than that they are
>responsible (but the trace may embed more opaque-to-you information to
>help them troubleshoot, of course; just like your bags have barcodes
>that you cannot understand but that are useful to the airline).

This is the exact need we have: opaque information.

I was told that when French Customs and Gendarmerie were asked to use 
TCP/IP to deversify from OSI they encapsulated the OSI packets into TCP/IP 
datagram and added crypted tracing data. This means that Hackers packets 
come with information about the hacker. May be someone knows better about 
their architecture? I think the idea interesting.

jfc



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At 19:27 14/08/03, Alex Rousskov wrote:
>On Thu, 14 Aug 2003, The Purple Streak, Hilarie Orman wrote:
>
> > Airlines have no responsibility or ability to recover passenger
> > items from government inspectors.  Don't repeat this mistake in
> > designing protocols.
>
>I do not think we are repeating any mistakes yet. Government
>inspectors are, apparently, outside of the airline equivalent of the
>OPES system and, hence, are not in the scope of this discussion.
>According to your comments, they are similar to a "transparent" proxy
>adapting traffic without either end authorization; we do not consider
>such entities because we cannot regulate them. We only consider
>entities that want to be called OPES entities and want to obey OPES
>rules.

This is a nice description of a hacker. Trace must help tro know who has 
been hacked.

> > OPES processors MUST support tracing.
>
>We are not discussing what OPES processors must support. We are
>discussing what OPES entities MUST be represented in any OPES trace.
>IMO, only OPES systems MUST be represented.

Please! Why are saying that again?
As per (y)our previous definition there is only one system in use (even if 
user may call on different system. "only OPES domains MUST be presented".
jfc





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On Fri, 15 Aug 2003, jfcm wrote:

> >We are not discussing what OPES processors must support. We are
> >discussing what OPES entities MUST be represented in any OPES
> >trace. IMO, only OPES systems MUST be represented.
>
> Please! Why are saying that again?
> As per (y)our previous definition there is only one system in use (even if
> user may call on different system. "only OPES domains MUST be presented".

The purpose of the trace is not to count OPES systems (there can be no
more than one on the other end), but to identify the OPES system (if
any).

As for OPES domains, it is not yet clear for me what they are in your
definition. Nevertheless, I believe that the other end MUST receive at
least one trace entry. If domains (whatever they are) within an OPES
system decide to disclose their identity, that's up to them.

Alex.



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From: "The Purple Streak, Hilarie Orman" <ho@alum.mit.edu>
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This is truly a barrel of red herring.  Separate mechanism from policy.

The discussion is the policy that an organization can set regarding
trace information.  The proposal is that processor ids can be
considered privileged information and deleted from the trace.  Fine,
then the organization must have a way to respond to queries about its
tracing policies and to respond "processor ID's are not available".
That doesn't mean that the policy is recommended, it doesn't have to
appear in any RFC.  An organization can have any policy its wants for
trace information, but it MUST support tracing mechanisms and it MUST
reveal its policy.

Hilarie




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On 01:43 15/08/03, Alex Rousskov said:
>The purpose of the trace is not to count OPES systems (there can be no
>more than one on the other end), but to identify the OPES system (if
>any).

OK. If you name that a Trace (I would name that a signature) good to me.

>As for OPES domains, it is not yet clear for me what they are in your
>definition. Nevertheless, I believe that the other end MUST receive at
>least one trace entry. If domains (whatever they are) within an OPES
>system decide to disclose their identity, that's up to them.

I name an OPES domain the area of reponsibility of an operator.
That information MUST be traced (even if totally or partially opaque).

1. to be informed of/if (which) different "boarders" have been crossed.

2. to be informed of the possible loops or creeps.
     If I expect 2 domain booarders to be crossed and I am reported
    10, I  know that an unexpected recursion happened.

3. To prevent some operators domain to be accessed is a need.
     The report of the domain being crossed is therefore a need.

4. The reporting can be opque to permut concerned domains
     to get the store the private info they need in case of trouble
     shouting.

jfc




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On Thu, 24 Jul 2003, The Purple Streak, Hilarie Orman wrote:

> The current consideration draft confuses "privacy" and "undetected
> modification" and "encryption".
>
> "Privacy" is about trusting a party with data that they may use but
> not disclose.  The detection modification of data is its
> "integrity", and it can be ensured by cryptographic methods,
> including keyed hashes and public key methods, but in general, not
> encryption.  Encryption is used for "confidentiality", and it can be
> accomplished by cryptographic methods, but it is not a way to ensure
> integrity: encrypted data on the wire can be undetectably modified
> by third parties unless a cryptographic integrity mechanism is used
> in conjunction with the encryption.

While do not fully agree with your interpretation of privacy,
integrity, and encryption, I would be more than happy to discuss
specific draft flaws and address these concerns (of course). What
draft text should be fixed in this regard?

> The current draft characterizes processor identification at content
> provider sites as "irrational"

I disagree. The draft says (emphasis added) "It is irrational to
expect a content provider to provide _access_ to internal hosts
participating in content generation". This is different from providing
identification of those hosts!

The point is that in a typical environment an end user would have no
way to access internal hosts, even if they are well identified.
Furthermore, even if such access is provided as an exception to
corporate integrity policy, the accessed servers will not be able to
tell the end user much because they are not designed for or have
enough information to communicate with end users. Note that the above
quoted text belongs to the "IP-layer communication" section. We are
discussing addressability of the OPES intermediaries there, nothing
else.

The conclusion in the current draft is that the IAB consideration in
question can apply to a "a very limited subset of OPES intermediaries"
and, hence, is not directly satisfiable in real world.

My feeling is that IAB did not see the big picture (OPES systems) and
focused their attention on components (OPES processors), creating
irrelevant/misleading concerns. I am guessing that they simply did not
consider common arrangements where many OPES processors form a single
OPES system, representing a single content/data provider.

Note that if IAB had expressed their concerns in terms of OPES
systems, we would have no problems satisfying them! My suggestion is
that we do not treat IAB concerns literary but apply our better
understanding of the problem domain to satisfy "true" IAB intent.

If you are familiar with Lawrence Lessig's work, this approach is
similar to re-interpreting the Constitution authors' intent in the
light of current [digital] reality instead of treating Constitution
text literary and, hence, inapplicable. To our advantage, IAB members
are still alive as opposed to US Constitution authors; we can always
get a second opinion. Moreover, I think Markus intended to get such a
second opinion sometime soon, using the existing draft.

> It is also argues that end users cannot identify themselves usefully
> to a content provider's internal processors.  Although I don't
> disagree that this might be true in some implementations, it isn't
> clear that it is impossible in practice.

It is not that the users cannot identify themselves. They
[technically] can. It is that the internal OPES processors do not
poses enough state and global understanding to respond to user
requests. Most OPES processors do not have a notion of a "user"; they
work with much more simple and well-focused objects like XML trees,
access counters, or ad images.

> I think that overall the viewpoint should clearly distinguish
> between protocol feasibility and impact on content provider
> practices.

The text is trying to distinguish between micro-level feasibility
(OPES processor MUST be addressable) and architectural macro-level
feasibility (OPES processor is invisible behind an OPES system which
MUST be addressable).


We can approach the problem from a different angle:

	IAB already made an exception for chained OPES processors.
	An OPES system is nothing else but a chain of OPES processors
	or a very similar structure. Clearly, there should be
	no difference to the end user whether she deals with
	a chain or a "graph/tree" of OPES processors as long as the
	exit point is addressable/identified!

Would that angle help you accept the notion of OPES system? If not,
where do you see an important difference between a "chain of OPES
processors with an addressable exit point" and a "graph of OPES
processors with an addressable exit point"?

Thank you,

Alex.



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Sounds like a good way to ensure that the documents never come close
to RFC status ...

Hilarie

On Fri, 15 Aug 2003 at 17:14:48 -0600 (MDT) Alex Rousskov scribbled:

> My suggestion is
> that we do not treat IAB concerns literary but apply our better
> understanding of the problem domain to satisfy "true" IAB intent.


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At 01:22 16/08/03, The Purple Streak, Hilarie Orman wrote:
>Sounds like a good way to ensure that the documents never come close to 
>RFC status ...

Understood and accepted.

This in turns sounds like the best explnation why my job is delayed for 15 
years due to what some call the IAB ineptitude to understand the real 
world. This is not a critic of the concerned people but of the very nature 
of the consensual system. Good for developement specification, not for 
innovative architecture.

Now question is: shall we stay with everyone, or shall we make them move 
ahaead?
jfc



>On Fri, 15 Aug 2003 at 17:14:48 -0600 (MDT) Alex Rousskov scribbled:
> > My suggestion is
> > that we do not treat IAB concerns literary but apply our better
> > understanding of the problem domain to satisfy "true" IAB intent.
>
>
>
>
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[ speaking as co-chair... ]
    
guys - this is tiring, so let's go back to first principles.
    
the charter is quite clear in saying that the work product has to
address the IAB considerations. it is also quite clear in stating that
the work product can diverge from those considerations providing that it
clearly documents the rationale.

to topic of what the iab/framers know or didn't know isn't
relevant. what is relevant is that the document editors need to make
sure that there is concise explanations as to why a given document
diverges, so that the poor iesg can decide whether the trade-off is
acceptable. (by definition, only the iesg and iab know what "the big
picture" is.)
    
thanks,
    
/mtr
    


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Marshall,

	I agree with your statement 100%. That is exactly what I was
trying to do when writing the "IAB treatment" draft: address what we
can, document what we cannot, and explain why.

	However, Hillarie asserts, in part, that if IAB says "OPES
processor MUST be addressible" then it must be addressible even it
makes no sense or is technically impossible. I disagree with such a
position. I assume that IAB will listen to reasonable arguments. This
difference in assumptions/approaches caused the discussion on this
thread.

	I am not sure how to proceed though. Clearly, we cannot say
both "OPES processor MUST be addressible" and "OPES processor MAY be
addressible". We have to pick wether our primary unit of concern is
OPES system as a whole or each OPES processor inside the system. I
think I used up all the arguments for the former. If Hillarie is not
convinced, we are stuck.

Alex.



On Sat, 16 Aug 2003, Marshall Rose wrote:

>
> [ speaking as co-chair... ]
>
> guys - this is tiring, so let's go back to first principles.
>
> the charter is quite clear in saying that the work product has to
> address the IAB considerations. it is also quite clear in stating that
> the work product can diverge from those considerations providing that it
> clearly documents the rationale.
>
> to topic of what the iab/framers know or didn't know isn't
> relevant. what is relevant is that the document editors need to make
> sure that there is concise explanations as to why a given document
> diverges, so that the poor iesg can decide whether the trade-off is
> acceptable. (by definition, only the iesg and iab know what "the big
> picture" is.)
>
> thanks,
>
> /mtr
>
>


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At 20:17 16/08/03, Alex Rousskov wrote:
>If Hillarie is not convinced, we are stuck.

I do not think so. If we take back the thinking we have;

1. IAB says each processor MUST be addressable
2. we say each OPES processor belongs to a domain
3. the owner of the domain may not want each of its OPES processors to be 
disclosed.

1. It seems that we can say that each OPES processor in an OPES system MUST 
be addressable through its OPES domain sub-address, however povided his 
OPES domain address is tracable; a  domain owner MAY opacfied the 
sub-address of his processors.

2. in the security part it can be underlined that the OPES domain owners 
should be adviszed not to disclose the domain adress of their processors or 
to provide coded addresses suitable for trouble shouting but not for access.


jfc 



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From: Alex Rousskov <rousskov@measurement-factory.com>
To: jfcm <info@utel.net>
cc: OPES WG <ietf-openproxy@imc.org>
Subject: Re: IAB considerations
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On Sat, 16 Aug 2003, jfcm wrote:

> At 20:17 16/08/03, Alex Rousskov wrote:
> >If Hillarie is not convinced, we are stuck.
>
> I do not think so. If we take back the thinking we have;
>
> 1. IAB says each processor MUST be addressable
> 2. we say each OPES processor belongs to a domain
> 3. the owner of the domain may not want each of its OPES processors to be
> disclosed.
>
> 1. It seems that we can say that each OPES processor in an OPES
> system MUST be addressable through its OPES domain sub-address,
> however povided his OPES domain address is tracable; a domain owner
> MAY opacfied the sub-address of his processors.
>
> 2. in the security part it can be underlined that the OPES domain
> owners should be adviszed not to disclose the domain adress of their
> processors or to provide coded addresses suitable for trouble
> shouting but not for access.

First of all, you are mixing two distinct properties: IP-level
addressability by end user (IAB consideration 2.2) and OPES processor
identification in the trace for end user (IAB consideration 3.2). The
opaque IDs will not make internal OPES processors addressable at IP
level. Nothing short of OPES-specific VPNs will -- the whole point of
an internal host is that it is not IP-addressable from the outside!

If we concentrate on processor identification alone, then I agree with
your approach as long as "opacification" (making opaque) of OPES IDs
includes removing them completely. There is absolutely no reason for
us to tell content provider how to identify their internal systems. In
a simple case, for example, there will be a single path through the
OPES system and no individual processor identification will be
necessary.

Combining the two observations above, we can see that we should
concentrate on specifying OPES system IDs and may ignore all other IDs
until we have spare cycles to waste.

Alex.


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To: Alex Rousskov <rousskov@measurement-factory.com>
From: jfcm <info@utel.net>
Subject: Re: IAB considerations
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At 05:33 17/08/03, Alex Rousskov wrote:
>First of all, you are mixing two distinct properties: IP-level 
>addressability by end user (IAB consideration 2.2) and OPES processor 
>identification in the trace for end user (IAB consideration 3.2).

I obvilusly know. We have an arbitrary logic demand and we have oractual 
needs. We have to start fomr the practical needs and see how/if they can 
match the arbitrary logic, to doucment a response.

>Combining the two observations above, we can see that we should 
>concentrate on specifying OPES system IDs and may ignore all other IDs 
>until we have spare cycles to waste.

Here I disagree. Identifying various OPES operators domain and reacting on 
that information is important. Because for example I do nottryst them or I 
do not make or I make business with them.

jfc







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Date: Sun, 17 Aug 2003 10:48:38 -0700
From: Marshall Rose <mrose@dbc.mtview.ca.us>
To: Alex Rousskov <rousskov@measurement-factory.com>
Cc: ietf-openproxy@imc.org
Subject: Re: IAB considerations
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> 	However, Hillarie asserts, in part, that if IAB says "OPES
> processor MUST be addressible" then it must be addressible even it
> makes no sense or is technically impossible. I disagree with such a
> position. I assume that IAB will listen to reasonable arguments. This
> difference in assumptions/approaches caused the discussion on this
> thread.
    
let's try this: edit the draft so that is complete and
self-consistent. to the extent it differs from what the IAB recommends,
make sure that the differences are explain and justified. then have a
friend take a pass through the document for clarity and conciseness.

we will then see if we have concensus around that document.
    
if so, we'll move forward, and wait to from the powers-that-be.
    
if not, we'll try a different approach.
    
/mtr


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To: Marshall Rose <mrose@dbc.mtview.ca.us>,
        Alex Rousskov
	 <rousskov@measurement-factory.com>
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Hi,
Sounds like a good plan

Abbie


> -----Original Message-----
> From: Marshall Rose [mailto:mrose@dbc.mtview.ca.us] 
> Sent: Sunday, August 17, 2003 1:49 PM
> To: Alex Rousskov
> Cc: ietf-openproxy@imc.org
> Subject: Re: IAB considerations
> 
> 
> 
> > 	However, Hillarie asserts, in part, that if IAB says 
> "OPES processor 
> > MUST be addressible" then it must be addressible even it makes no 
> > sense or is technically impossible. I disagree with such a 
> position. I 
> > assume that IAB will listen to reasonable arguments. This 
> difference 
> > in assumptions/approaches caused the discussion on this thread.
>     
> let's try this: edit the draft so that is complete and 
> self-consistent. to the extent it differs from what the IAB 
> recommends, make sure that the differences are explain and 
> justified. then have a friend take a pass through the 
> document for clarity and conciseness.
> 
> we will then see if we have concensus around that document.
>     
> if so, we'll move forward, and wait to from the powers-that-be.
>     
> if not, we'll try a different approach.
>     
> /mtr
> 

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<P><FONT SIZE=2>Hi,</FONT>
<BR><FONT SIZE=2>Sounds like a good plan</FONT>
</P>

<P><FONT SIZE=2>Abbie</FONT>
</P>
<BR>

<P><FONT SIZE=2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=2>&gt; From: Marshall Rose [<A HREF="mailto:mrose@dbc.mtview.ca.us">mailto:mrose@dbc.mtview.ca.us</A>] </FONT>
<BR><FONT SIZE=2>&gt; Sent: Sunday, August 17, 2003 1:49 PM</FONT>
<BR><FONT SIZE=2>&gt; To: Alex Rousskov</FONT>
<BR><FONT SIZE=2>&gt; Cc: ietf-openproxy@imc.org</FONT>
<BR><FONT SIZE=2>&gt; Subject: Re: IAB considerations</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; &nbsp;&nbsp;&nbsp; However, Hillarie asserts, in part, that if IAB says </FONT>
<BR><FONT SIZE=2>&gt; &quot;OPES processor </FONT>
<BR><FONT SIZE=2>&gt; &gt; MUST be addressible&quot; then it must be addressible even it makes no </FONT>
<BR><FONT SIZE=2>&gt; &gt; sense or is technically impossible. I disagree with such a </FONT>
<BR><FONT SIZE=2>&gt; position. I </FONT>
<BR><FONT SIZE=2>&gt; &gt; assume that IAB will listen to reasonable arguments. This </FONT>
<BR><FONT SIZE=2>&gt; difference </FONT>
<BR><FONT SIZE=2>&gt; &gt; in assumptions/approaches caused the discussion on this thread.</FONT>
<BR><FONT SIZE=2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; </FONT>
<BR><FONT SIZE=2>&gt; let's try this: edit the draft so that is complete and </FONT>
<BR><FONT SIZE=2>&gt; self-consistent. to the extent it differs from what the IAB </FONT>
<BR><FONT SIZE=2>&gt; recommends, make sure that the differences are explain and </FONT>
<BR><FONT SIZE=2>&gt; justified. then have a friend take a pass through the </FONT>
<BR><FONT SIZE=2>&gt; document for clarity and conciseness.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; we will then see if we have concensus around that document.</FONT>
<BR><FONT SIZE=2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; </FONT>
<BR><FONT SIZE=2>&gt; if so, we'll move forward, and wait to from the powers-that-be.</FONT>
<BR><FONT SIZE=2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; </FONT>
<BR><FONT SIZE=2>&gt; if not, we'll try a different approach.</FONT>
<BR><FONT SIZE=2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; </FONT>
<BR><FONT SIZE=2>&gt; /mtr</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
</P>

</BODY>
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From: Alex Rousskov <rousskov@measurement-factory.com>
To: jfcm <info@utel.net>
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Subject: Re: IAB considerations
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On Sun, 17 Aug 2003, jfcm wrote:

> At 05:33 17/08/03, Alex Rousskov wrote:
>
> >Combining the two observations above, we can see that we should
> >concentrate on specifying OPES system IDs and may ignore all other IDs
> >until we have spare cycles to waste.
>
> Here I disagree. Identifying various OPES operators domain and
> reacting on that information is important. Because for example I do
> nottryst them or I do not make or I make business with them.

I dod not say it is not important. It is just a much smaller scale
problem, where no good general solution may exist. If this WG does not
define a solution for OPES processor identification (but defines OPES
system identification), then OPES will still "work" and satisfy IAB
concerns (in my rendition of them). The reverse is not true, IMO: OPES
processor identification alone will not satisfy IAB (or mine)
concerns.

Alex.



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From: Alex Rousskov <rousskov@measurement-factory.com>
To: jfcm <info@utel.net>
cc: ietf-openproxy@imc.org
Subject: RE: [end points comm] OPES System
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On Fri, 15 Aug 2003, jfcm wrote:

> I name an OPES domain the area of reponsibility of an operator.

What's an operator or operator responsibility? When Disney-owned
content is created on and made available via Akamai servers, is Disney
an operator? Is Akamai? Is Disney+Akamai?

Alex.


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Hi,

rather than responding to individual emails, let me try to summarize 
the thread (while catching-up with queued emails...).

Goal: Tracing must allow the endpoints to detect that some OPES 
services were involved, and which party to contact in order to resolve 
possible problems. This has resulted in different views:

(a) One view is that this requires each individual OPES processor to 
support tracing. Policies can be used to authorize who can turn on 
tracing and who can see the results.

(b) Another view is that this requires only one trace per "OPES 
system", with an "OPES system" being the collection of entities that 
are trusted by the respective endpoint. This assumes that certain 
business arrangements/rules are in place, which will ensure that 
problems can be traced across carrier domains.

(c) One view might be that this requires only tracing per "OPES 
domain", with an "OPES domain" being the collection of entities 
operated by a single carrier.

Both, (b) and (c), assume that the carriers somehow have enough 
(internal) information to answer possible inquiries, e.g. they 
themselves must figure out which exact OPES processors have been 
involved when a specific user inquiry comes in.


For each of the views, it would be helpful to detail and to illustrate 
the entire tracing process showing an example scenario, including how 
a user would inquire about suspected problems and how this inquiry 
would be resolved. [It might also be helpful to learn from existing 
solutions to similar problems in other protocol areas, e.g. email etc.]

Since (b) seems to be the most "relaxed" view, let's start with this 
approach, and then see whether/how it solves real-life problems, 
whether the assumptions are valid, how it addresses the IAB 
considerations, and how differences to IAB consideration will be 
explained.

-Markus



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jfcm wrote:

> please stop confusing system and domains!

Not sure wheher I'm the one who's confusing things...

I refered to "OPES domain" as a collection of OPES entities operated 
by a single carrier, while an "OPES system" is rather described by 
trust boundaries. Depending on how we define tracing, we probably need 
only one of the terms.

-Markus



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Alex Rousskov wrote:

> [...] Moreover, I think Markus intended to get such a
> second opinion sometime soon, using the existing draft.

Let's add some more details and, in particular, an example showing a 
specific trace flow and how it would be used to resolve problems. My 
feeling is that this would be helpful when asking of additional opinions.

-Markus



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On Mon, 18 Aug 2003, Markus Hofmann wrote:

> Alex Rousskov wrote:
>
> > [...] Moreover, I think Markus intended to get such a
> > second opinion sometime soon, using the existing draft.
>
> Let's add some more details and, in particular, an example showing a
> specific trace flow and how it would be used to resolve problems. My
> feeling is that this would be helpful when asking of additional
> opinions.

Agreed. In theory, three drafts will need to updated to provide an
example: OPES communications draft (Abbie), HTTP adaptation draft
(Martin Stecher or myself), and IAB treatment draft (Abbie or myself).
I will update IAB treatment draft soon. That should be enough to get
us started with the IAB review and other drafts can catch up if the
review is positive.

Thanks,

Alex.



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From: jfcm <info@utel.net>
Subject: RE: [end points comm] OPES System
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At 19:41 18/08/03, Alex Rousskov wrote:

>On Fri, 15 Aug 2003, jfcm wrote:
> > I name an OPES domain the area of reponsibility of an operator.
>
>What's an operator or operator responsibility? When Disney-owned
>content is created on and made available via Akamai servers, is Disney
>an operator? Is Akamai? Is Disney+Akamai?

This is where you are confusing the issues by pleasure.
The responsible operator is the one saying he is responsible.
Stick to your airline image and do not make too many layer violation.

NO processor should be without domain operator.  And no processor can be 
with two separate domain owner. Otherwise I will/people will _NEVER_ 
trust.use an OPES.

This means that every processor MUST be something and that something is to 
be decided by its operator. And as a SYSTEM user I must be able to 
say/decide if I trust or not an operator for who he is or for the 
information he discloses or for the cost of his services.

You just do not pick any cab (system) because they are cabs. And every cab 
has a number makingtem part of a domain/company. They can fake them, they 
can hide them. It is up to you to decide if you trust or not a hiden number 
cab, for example because you like the name of the cab company or because 
you want to commit suicide.

jfc






>Alex.
>
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>
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From: Alex Rousskov <rousskov@measurement-factory.com>
To: jfcm <info@utel.net>
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On Mon, 18 Aug 2003, jfcm wrote:

> At 19:41 18/08/03, Alex Rousskov wrote:
>
> >On Fri, 15 Aug 2003, jfcm wrote:
> > > I name an OPES domain the area of reponsibility of an operator.
> >
> >What's an operator or operator responsibility? When Disney-owned
> >content is created on and made available via Akamai servers, is Disney
> >an operator? Is Akamai? Is Disney+Akamai?
>
> This is where you are confusing the issues by pleasure.
> The responsible operator is the one saying he is responsible.
> Stick to your airline image and do not make too many layer violation.
>
> NO processor should be without domain operator.  And no processor can be
> with two separate domain owner. Otherwise I will/people will _NEVER_
> trust.use an OPES.
>
> This means that every processor MUST be something and that something
> is to be decided by its operator. And as a SYSTEM user I must be
> able to say/decide if I trust or not an operator for who he is or
> for the information he discloses or for the cost of his services.

That's fine, but you need a better definition of a domain and/or
operator. The original "OPES domain is the area of reponsibility of an
operator" does not imply the above explanation.

Also, since you leave domain boundaries for the operator to decide,
you need to explain how conflicts (two operators think they are
responsible for the same domain and instruct their processors to
update the trace accordingly) and misses (no operator claims
responsibility for a domain/processor).

Alex.


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Date: Tue, 19 Aug 2003 00:15:07 +0200
To: Markus Hofmann <markus@mhof.com>
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Subject: Re: [end points comm] OPES System
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At 22:32 18/08/03, Markus Hofmann wrote:
>jfcm wrote:
>
>>please stop confusing system and domains!
>
>Not sure wheher I'm the one who's confusing things...
>
>I refered to "OPES domain" as a collection of OPES entities operated by a 
>single carrier, while an "OPES system" is rather described by trust 
>boundaries. Depending on how we define tracing, we probably need only one 
>of the terms.

No, sir.

The OPES system is the system providing me/I organize to provide me a 
service. I need to reference it. But I can have several OPES system 
providing me the same service.

Each of theses OPES system can be actually built in using system bu 
different operators with different responsibilities.

Example: My ISP provides me translating services of the web pages I access. 
He calls on several services depending on the language: this is his 
WEBTranslationSystem

He also provide the same translation service for mail he names 
Translate-mailSystem. These are two different systems and I need to 
identify them.

Now WEBTS uses different translation servers, so does Te-mS. One is BBC and 
one is CNN. I does not like CNN, so I want to bar the CNN domain. As he 
does not want to lose me my ISP accepts to trim the load and to permit me 
to use BBC on both System but with a markup on Te-mS as it is a special 
service. Now I may decide to degrade to CNN on option for low importance 
mails. I obviously want to automate all that and be able to make 
statitstics etc.

Now, CNN can come with a special deal: if I accept some delays they will 
permit me to use some of their processors @ lower cost, etc....


The system is my/someone decided construct. Like an Airline System.
The domain is the processor owner accepted area of responsiblity? Like an 
Airport.

Now to know if this is runway 31 or runway 33, (identifiying each 
processor) this may or not be of used and disclosed by the domain owner, 
potentially to who they want (crypted).

Two totally different things.
jfc

























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At 23:41 18/08/03, Alex Rousskov wrote:
>On Mon, 18 Aug 2003, jfcm wrote:
> > At 19:41 18/08/03, Alex Rousskov wrote:
> >
> > >On Fri, 15 Aug 2003, jfcm wrote:
> > > > I name an OPES domain the area of reponsibility of an operator.
> > >
> > >What's an operator or operator responsibility? When Disney-owned
> > >content is created on and made available via Akamai servers, is Disney
> > >an operator? Is Akamai? Is Disney+Akamai?
> >
> > This is where you are confusing the issues by pleasure.
> > The responsible operator is the one saying he is responsible.
> > Stick to your airline image and do not make too many layer violation.
> >
> > NO processor should be without domain operator.  And no processor can be
> > with two separate domain owner. Otherwise I will/people will _NEVER_
> > trust.use an OPES.
> >
> > This means that every processor MUST be something and that something
> > is to be decided by its operator. And as a SYSTEM user I must be
> > able to say/decide if I trust or not an operator for who he is or
> > for the information he discloses or for the cost of his services.
>
>That's fine, but you need a better definition of a domain and/or
>operator. The original "OPES domain is the area of reponsibility of an
>operator" does not imply the above explanation.
>
>Also, since you leave domain boundaries for the operator to decide,
>you need to explain how conflicts (two operators think they are
>responsible for the same domain and instruct their processors to
>update the trace accordingly) and misses (no operator claims
>responsibility for a domain/processor).

I must go. But I think better anyway to proceed with a general
response and see what you objet as I do not understand your
question. So I suppose there is confusion to clarify.

Let stick to the Airline image. And let take the following analogy
(different of the one I took with Markus, but as good and clearer here).

A   jet        = processor
An airline   = domain - area of responsibility of the ariline operator.
An alliance (or a tour or a travel I organize, etc.) = a system

Are all your questions answered or not?
If not where are you difficulties coming from?
The analogy or  from not addressed conflicts?

jfc







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Date: Tue, 19 Aug 2003 08:43:40 -0600 (MDT)
From: Alex Rousskov <rousskov@measurement-factory.com>
To: jfcm <info@utel.net>
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Subject: RE: [end points comm] OPES System
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On Tue, 19 Aug 2003, jfcm wrote:

> At 23:41 18/08/03, Alex Rousskov wrote:
> >
> >That's fine, but you need a better definition of a domain and/or
> >operator. The original "OPES domain is the area of reponsibility of
> >an operator" does not imply the above explanation.
> >
> >Also, since you leave domain boundaries for the operator to decide,
> >you need to explain how conflicts (two operators think they are
> >responsible for the same domain and instruct their processors to
> >update the trace accordingly) and misses (no operator claims
> >responsibility for a domain/processor).
>
> I must go. But I think better anyway to proceed with a general
> response and see what you objet as I do not understand your
> question. So I suppose there is confusion to clarify.
>
> Let stick to the Airline image. And let take the following analogy
> (different of the one I took with Markus, but as good and clearer
> here).
>
> A   jet        = processor
> An airline   = domain - area of responsibility of the ariline operator.
> An alliance (or a tour or a travel I organize, etc.) = a system
>
> Are all your questions answered or not?
> If not where are you difficulties coming from?
> The analogy or  from not addressed conflicts?

I can use the airline analogy to illustrate what is missing in your
definitions, though it may not be a perfect example:

Lack of responsibility:

	Your tour group arrives at the destination
	with their bags lost. They call you (the
	"system" contact point) to complain. You tell
	them that the bags are not your responsibility
	and they should check with the last jet airline.
	They go to the last airline, Northwest Airlines.
	Northwest tells them that the last leg on their
	itinerary was operated by KLM and they have to
	complain to KLM. KLM says that based on their
	agreement with Northwest, Northwest is responsible
	for the lost baggage.

	Thus, your group has contacted three suspects and all refused
	to take responsibility. Since your definitions rely
	on somebody to accept/define responsibility, it is not clear
	who is at fault here.

Double responsibility:

	Upon arrival, your tour group discovers that they
	were awarded twice the miles they should have been
	because both KLM and Northwest airlines took the
	responsibility to award miles for the trip. Each
	individual airline claims it had the right to do
	that since they can define the area of responsibility any way
	they want.

HTH,

Alex.



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Date: Tue, 19 Aug 2003 09:02:51 -0700
From: Marshall Rose <mrose@dbc.mtview.ca.us>
Cc: Alex Rousskov <rousskov@measurement-factory.com>, ietf-openproxy@imc.org
Subject: Re: IAB considerations
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> let's try this: edit the draft so that is complete and
> self-consistent. to the extent it differs from what the IAB recommends,
> make sure that the differences are explain and justified. then have a
> friend take a pass through the document for clarity and conciseness.

ok, so when are we going to have this submitted as an I-D?

/mtr


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From: Alex Rousskov <rousskov@measurement-factory.com>
To: Marshall Rose <mrose@dbc.mtview.ca.us>
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Subject: Re: IAB considerations
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On Tue, 19 Aug 2003, Marshall Rose wrote:

> > let's try this: edit the draft so that is complete and
> > self-consistent. to the extent it differs from what the IAB recommends,
> > make sure that the differences are explain and justified. then have a
> > friend take a pass through the document for clarity and conciseness.
>
> ok, so when are we going to have this submitted as an I-D?

I can commit to finish another update by the end of this week,
hopefully sooner. We will probably need at least three working days
for a WG-wide review and then a day or two to apply changes suggested
by that review, assuming the WG decides to proceed with the draft as a
WG draft.

Does August 30 sound like a reasonable self-imposed submission
deadline?

Thanks,

Alex.


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From: Marshall Rose <mrose@dbc.mtview.ca.us>
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> I can commit to finish another update by the end of this week,
> hopefully sooner. We will probably need at least three working days
> for a WG-wide review and then a day or two to apply changes suggested
> by that review, assuming the WG decides to proceed with the draft as a
> WG draft.
> 
> Does August 30 sound like a reasonable self-imposed submission
> deadline?

i can't quite parse this.

what you need to do is to submit an I-D you say "works" according to the
criteria i gave you.

at that point, the chairs decide what the timeline is for review, comments, and
whether their is concensus, based on what the feedback is on the mailing list.

in other words: submit the draft on friday morning, and we'll worry about the
rest later.

/mtr


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Alex Rousskov wrote:

> [...]
> 
> I doubt the above differences can be resolved by a compromise. One
> primary direction should be chosen by the working group. Am I the only
> person disliking the general direction of irml-03?

Folks, please post if you've an opinion on this matter, since we 
really need to decide what to do with the rules language, whether to 
adopt the IRML draft and keep working on it as WG draft, or whether 
someone is willing to commit writing an alternative approach.

-Markus



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From: Andre Beck <abeck@bell-labs.com>
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Subject: Re: processing points in draft-beck-opes-irml-03
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Alex Rousskov wrote:
> Is the concept of a "processing point" application-agnostic? If it is
> application-specific, it should be removed from the
> application-agnostic spec (draft-beck-opes-irml-03).

I think the concept of processing points is indeed application agnostic, 
even though each application protocol may have different processing 
points. This depends, for example, on whether or not an OPES processor 
can implement a cache for the application protocol and on the 
request/response scheme of the application protocol.

> If we believe that every application protocol has some "processing
> points", then the definition of HTTP-specific points should probably
> be moved from draft-beck-opes-irml-03 to an HTTP binding for IRML. It
> may also be more appropriate to migrate from numbers to tokens/strings
> when describing application-specific points.

Yes, I think application-specific processing points should be defined in 
the corresponding application protocol binding for IRML, but I still 
think that it makes sense to define a general mechanism of how to 
specify processing points in IRML rules in the IRML spec. Is this what 
you had in mind as well?

-Andre





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Date: Tue, 19 Aug 2003 17:39:43 -0400
From: Andre Beck <abeck@bell-labs.com>
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Alex,

> 	- You envision IRML to be used to describe very basic
> 	  rules, occasionally distributed to OPES processors
> 	  using off-band mechanisms. You want the language
> 	  itself to make it difficult to describe complex
> 	  manipulations.

It was not an explicit design goal to make it difficult to describe 
complex manipulations, but rather this resulted from the fact that we 
didn't see a requirement/need to support complex manipulations and in 
particular didn't want to allow advanced flow control constructs such as 
loops etc.

> IRML inspiration comes, in part,
> 	  from CPL which targets IP telephony needs.

Correct. It's true that CPL targets IP telephony, but the requirements 
on CPL are surprisingly similar to those of OPES systems which is we 
decided to partly model IRML after CPL. For example, CPL is (signaling) 
protocol agnostic, is limited in power so that it can run safely in 
Internet (telephony) servers, defines rule conditions that match 
patterns against protocol header values etc.

-Andre




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From: Alex Rousskov <rousskov@measurement-factory.com>
To: Andre Beck <abeck@bell-labs.com>
cc: OPES WG <ietf-openproxy@imc.org>
Subject: Re: processing points in draft-beck-opes-irml-03
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On Tue, 19 Aug 2003, Andre Beck wrote:

> Yes, I think application-specific processing points should be
> defined in the corresponding application protocol binding for IRML,
> but I still think that it makes sense to define a general mechanism
> of how to specify processing points in IRML rules in the IRML spec.
> Is this what you had in mind as well?

Yes, kind of. It all depends on the overall language design. With the
current design, we have to describe "processing point" as a general
concept/attribute (without defining any application-specific values).
This is because the current draft makes this particular attribute
special compared to other "properties". You have already explained the
motivation behind this design.

An alternative is a an approach where "processing point" becomes just
one of the application-specific properties and requires no special
treatment or even documentation in the IRML Core. Application-specific
interpreters or compilers would be free to treat/optimize this
property specially, of course.

Alex.


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Date: Tue, 19 Aug 2003 21:44:34 +0200
To: Alex Rousskov <rousskov@measurement-factory.com>
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On 16:43 19/08/03, Alex Rousskov said:
>On Tue, 19 Aug 2003, jfcm wrote:
> > At 23:41 18/08/03, Alex Rousskov wrote:
> > >
> > >That's fine, but you need a better definition of a domain and/or
> > >operator. The original "OPES domain is the area of reponsibility of
> > >an operator" does not imply the above explanation.
> > >
> > >Also, since you leave domain boundaries for the operator to decide,
> > >you need to explain how conflicts (two operators think they are
> > >responsible for the same domain and instruct their processors to
> > >update the trace accordingly) and misses (no operator claims
> > >responsibility for a domain/processor).
> >
> > I must go. But I think better anyway to proceed with a general
> > response and see what you objet as I do not understand your
> > question. So I suppose there is confusion to clarify.
> >
> > Let stick to the Airline image. And let take the following analogy
> > (different of the one I took with Markus, but as good and clearer
> > here).
> >
> > A   jet        = processor
> > An airline   = domain - area of responsibility of the ariline operator.
> > An alliance (or a tour or a travel I organize, etc.) = a system
> >
> > Are all your questions answered or not?
> > If not where are you difficulties coming from?
> > The analogy or  from not addressed conflicts?
>
>I can use the airline analogy to illustrate what is missing in your
>definitions, though it may not be a perfect example:

Usually a good one. Let take it as long as it does not fail us.

>Lack of responsibility:

here you confuse system and domain operator.

1. as a user you go and see the system. Since you chose the image of a tour 
operator, the ystem for the user is the group operator. Period.

2. as a tour operator. i.e. a system. Your problem is to find back the 
luggage. And believe me, from experience as an operator _every relevant 
infromation_ to do that is necessary.

>         Your tour group arrives at the destination
>         with their bags lost. They call you (the
>         "system" contact point) to complain. You tell
>         them that the bags are not your responsibility
>         and they should check with the last jet airline.

Then they sue you and win.

>         They go to the last airline, Northwest Airlines.

Nroth West will not speak to them. They do not even know them as 
passengers. They only know you as a tour, etc....

>         Northwest tells them that the last leg on their
>         itinerary was operated by KLM and they have to
>         complain to KLM. KLM says that based on their
>         agreement with Northwest, Northwest is responsible
>         for the lost baggage.
>
>         Thus, your group has contacted three suspects and all refused
>         to take responsibility. Since your definitions rely
>         on somebody to accept/define responsibility, it is not clear
>         who is at fault here.

I nover said that. I said that it is to people to accept to be a domain 
operator for a CPU/jet.
That is to have the responibility of a domain. I selfom saw a jet takingof 
without pilot.

>Double responsibility:
>
>         Upon arrival, your tour group discovers that they
>         were awarded twice the miles they should have been
>         because both KLM and Northwest airlines took the
>         responsibility to award miles for the trip.

Who will complain :-)


>         Each
>         individual airline claims it had the right to do
>         that since they can define the area of responsibility any way
>         they want.

You probably missed one point again in confusing reponsibility and domain 
of responsibility (strange that such an obvious notion to any operational 
person can be a problem to you.). No CPU - jet - can have two owners or no 
owner. Fact of the life. You may tell your neighbor that his wife is yours, 
but usually law prevents this not to be a bug.
jfc



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From: Alex Rousskov <rousskov@measurement-factory.com>
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On Tue, 19 Aug 2003, jfcm wrote:

> You probably missed one point again in confusing reponsibility and
> domain of responsibility (strange that such an obvious notion to any
> operational person can be a problem to you.). No CPU - jet - can
> have two owners or no owner. Fact of the life. You may tell your
> neighbor that his wife is yours, but usually law prevents this not
> to be a bug. jfc

Things that are clear to most people in the real world become very
fuzzy in the virtual reality that we are building and documenting
here. Not to mention that I disagree with your assumption that
ownership and domain of responsibility are always clear in real world.

The "take them to court and win the case" answer is not satisfactory
to me. I want the specs to be clear how the responsibility is
assigned, traced, and managed.

Alex.



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From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES WG <ietf-openproxy@imc.org>
cc: Lee Beaumont <lee@isoeasy.com>
Subject: renaming original dataflow 
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OCP calls application data flowing from OPES processor to callout
server "original". This term is used to describe both dataflow and
related OCP commands. The flow in the opposite direction is called
"adapted".

Several people were unhappy with the word "original" to describe the
concept. Lee Beaumont, an independent consultant reviewing OCP draft,
suggested a few alternatives:

	source, pristine, maiden, virgin,
	primal, prime, primary, prior,
	raw, initial, master, prototype, starting

From the above list, I like "virgin" the most. Any other opinions?
Does anybody think that "virgin dataflow" is better than current
"original dataflow"?

Thank you,

Alex.


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From: jfcm <info@utel.net>
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At 18:19 20/08/03, Alex Rousskov wrote:
>OCP calls application data flowing from OPES processor to callout
>server "original". This term is used to describe both dataflow and
>related OCP commands. The flow in the opposite direction is called
>"adapted".
>
>Several people were unhappy with the word "original" to describe the
>concept. Lee Beaumont, an independent consultant reviewing OCP draft,
>suggested a few alternatives:
>
>         source, pristine, maiden, virgin,
>         primal, prime, primary, prior,
>         raw, initial, master, prototype, starting

"initial" seems the more internationaly sound.
And the nearest of "original" which is probably better (at least for Fren=
ch=20
speakers)

I doubt "virigin" belongs to Basic English?

Also the word is to mean "the initial data in this OPES system", but not=20
necessarily in other systems (OPES or not) so raw, master, prototype,=20
source are probably inadequate?

Another problem are "virgin data" still virgin after having crossed an OP=
ES=20
system and stayed unaltered? Many people will ask because not n=E9cessari=
ly=20
obvious?

> >From the above list, I like "virgin" the most. Any other opinions?
>Does anybody think that "virgin dataflow" is better than current
>"original dataflow"?
>
>Thank you,
>
>Alex.
>
>
>
>
>---
>Incoming mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
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To: Alex Rousskov <rousskov@measurement-factory.com>
From: jfcm <info@utel.net>
Subject: RE: [end points comm] OPES System
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At 17:48 20/08/03, Alex Rousskov wrote:
>On Tue, 19 Aug 2003, jfcm wrote:
>Things that are clear to most people in the real world become very fuzzy 
>in the virtual reality that we are building and documenting here. Not to 
>mention that I disagree with your assumption that
>ownership and domain of responsibility are always clear in real world.

Sorry, these are comments. Not real logical facts.

We have a hierarchical identification:
- top is system
- below is domain
- below is server
- below is service
- below or aside is the traveler

You may certainly imagine identification plan/protocol violations. But 
please come document them.
In the model we chose (airtransport) as seen from the users (not from a 
single user _and_ from a tour operator):

- the system (alliance, tour, travel) is identfied by the Warsaw 
conventions and the issuer of the ticket
- the domain (airline) is idenfied by its international code
- the server (plane) is international identified by its indicative and IFF 
or eventually destroyed (what you expect from an hacker)
- the stewart, the offered bottle, the milleage plan, the luggages, the 
passengers, are idenified and traced in many ways, sometimes there are 
confusions but that works usually well because protocols are pretty clear.


OK I accept that when we started I asked if OPES were ONES or not and I 
gave air reservation and  SITA attached systems as a ONES example. Or Swift 
related systems.

So I am ready to accept that OPES do not qualify to support that type of 
need, if you say so. But I do not see why.
jfc












>The "take them to court and win the case" answer is not satisfactory
>to me. I want the specs to be clear how the responsibility is
>assigned, traced, and managed.

This was not a response to a technical problem. Only a comment on the way 
the question was meaningless because you confused two layers.

You cannot demand a protocol to respond a question it is not to be asked.



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On Wed, 20 Aug 2003, jfcm wrote:

> Another problem are "virgin data" still virgin after having crossed
> an OPES system and stayed unaltered? Many people will ask because
> not n=E9cessarily obvious?

By OCP definition, any data that was processed (seen/touched) by a
callout server is "adapted", regardless of whether data bytes remained
unchanged. The idea is that just seeing (hence, possibly copying or
exporting) the data is sufficiently important to be traced/etc. In
other words, in OCP context, seeing data is as important as modifying
data.

Whatever word we choose, the problem you mention will persist, I
guess. The only solution may be to go back to "input/output"
terminology which I think we already rejected for other reasons.

Alex.



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From: Alex Rousskov <rousskov@measurement-factory.com>
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On Wed, 20 Aug 2003, jfcm wrote:

> - the system (alliance, tour, travel) is identfied by the Warsaw
> conventions and the issuer of the ticket

Exactly. What we need is an equivalent of Warsaw Convention. That is
what is missing in your definition. "Accepting/taking the
responsibility" is not sufficient. There has to be some rules about it
(to avoid duplication or lack of responsibility).

Alex.


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At 22:00 20/08/03, Alex Rousskov wrote:
>On Wed, 20 Aug 2003, jfcm wrote:
> > - the system (alliance, tour, travel) is identfied by the Warsaw
> > conventions and the issuer of the ticket
>
>Exactly. What we need is an equivalent of Warsaw Convention. That is
>what is missing in your definition. "Accepting/taking the
>responsibility" is not sufficient. There has to be some rules about it
>(to avoid duplication or lack of responsibility).

Alex please consider what I/we said.

The system is by essence what the user, the provider or a third party as 
decided as a global service. This is what in the Airline analogy we call 
the travel (user), the alliance (Air France with Delta, with NorthWest, etc 
against BA alliance etc.)

The domain is the airline. It is made by a company accepting/taking 
responsbility to buy airplanes, to hire pilots, etc. No one else will setup 
any rule on the free decision of the investors, entrepreneurs, etc. Like it 
or not. And no other rule than the decision of the customers will say if 
they want or not to fly American Airways. I do not understand your problem.

There cannot be lack of responsibilty - unless you the OCP designer wants 
it, but the TSA will not permit it. This means that you want to accept 
unknown planes, without pilots.

As indicated there is a clear indentifcation hierarchy system, domain, 
server/service which permits everyone to determine classes of users and 
permitted access groups of domains (my first mails on this list) so one can 
deal with prefered, accepted, obliged services, security, laws, commercial 
policies, real life operations. etc.

I really am at pain understanding your problem. And at understanding hos 
you cannot understand operators and users needs.

Or please give examples. Or am I dumb stupid ?

jfc




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At 21:57 20/08/03, Alex Rousskov wrote:
>On Wed, 20 Aug 2003, jfcm wrote:
>
> > Another problem are "virgin data" still virgin after having crossed
> > an OPES system and stayed unaltered? Many people will ask because
> > not n=E9cessarily obvious?
>
>By OCP definition, any data that was processed (seen/touched) by a
>callout server is "adapted", regardless of whether data bytes remained
>unchanged. The idea is that just seeing (hence, possibly copying or
>exporting) the data is sufficiently important to be traced/etc. In
>other words, in OCP context, seeing data is as important as modifying
>data.


You are right.
The point is only is this. Are the two sentences intuitively clear
for every one.

"The virgin data adaptation left them unchanged"
"The original data adaptation left them unchanged".

The first one is not clear to me as "virigin" intuitively means
that nothing happened even leaving it unchanged.

Example: the "touch" command does not affect a file.
But a "touched" file for me is no more virgin.

Just semantic. But simplifies the thing when the words
intuitively translate well.

jfc



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On Wed, 20 Aug 2003, jfcm wrote:

> The point is only is this. Are the two sentences intuitively clear
> for every one.
>
> "The virgin data adaptation left them unchanged"
> "The original data adaptation left them unchanged".
>
> The first one is not clear to me as "virigin" intuitively means
> that nothing happened even leaving it unchanged.

Both sentences are very confusing (grammatically, IMHO). A better
version might be:

"Adaptation of virgin data resulted in no changes to the data"
"Adaptation of original resulted in no changes to the data"

Both make sense and are clear enough to me.

The problem comes when we say

"Adapted data was not changed by the callout server"
"Adapted data and original data are identical"

Some would question: What was "adapted" then?

Alex.


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Date: Fri, 22 Aug 2003 11:55:16 -0700
From: Marshall Rose <mrose@dbc.mtview.ca.us>
To: ietf-openproxy@imc.org
Subject: moving along on rules language
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[ speaking as co-chair...]

the milestones require that we have a rules language draft this month.
    
thus far, there's been only one candidate (that has seen a fair amount of
feedback during pre-WG times, but only very narrow feedback recently).
    
we need to decide whether we want to finish opes.
    
if not, let's disband now, and i can go back to managing some other
disasters.
    
otherwise, then unless someone can produce a credible alternative pdq,
we should start with the beck irml document, finish it, and then
decide whether there's a concensus (just like we're doing with the
document alex is working on).

any objections?

/mtr


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From: Alex Rousskov <rousskov@measurement-factory.com>
To: Marshall Rose <mrose@dbc.mtview.ca.us>
cc: ietf-openproxy@imc.org
Subject: Re: moving along on rules language
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On Fri, 22 Aug 2003, Marshall Rose wrote:

> otherwise, then unless someone can produce a credible alternative pdq,

Could you please briefly define/describe rough credibility criteria?
For example, does the alternative need to come as an ID comparable to
irml-03 in size? Does the alternative have to cover HTTP and other
application-specific things that irml-03 covers (though there may
already be consensus that those things do not belong to IRML Core)?

I can come up with an alternative that a reasonable technical person
would understand and can extrapolate, but I need to know the minimum
requirements better so that I do not waste time on something that
cannot be accepted as a viable alternative in the nearest future.

Thank you,

Alex.


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From: Marshall Rose <mrose@dbc.mtview.ca.us>
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> Could you please briefly define/describe rough credibility criteria?
    
sure.

    
> For example, does the alternative need to come as an ID comparable to
> irml-03 in size?
    
no. beck-irml-03 is pretty much fleshed-out, so i'd expect an
alternative to be copmlete enough for someone to understand what's going
on, without having all the detail filled-in.

    
> Does the alternative have to cover HTTP and other
> application-specific things that irml-03 covers (though there may
> already be consensus that those things do not belong to IRML Core)?
    
the charter says HTTP is a MUST, others aren't. so the alternative, at a
minimum, MUST deal with with HTTP
    
    
    
> I can come up with an alternative that a reasonable technical person
> would understand and can extrapolate, but I need to know the minimum
> requirements better so that I do not waste time on something that
> cannot be accepted as a viable alternative in the nearest future.

great. if your confident with an alternative approach, put an initial
document together and submit it. i don't want to forestall alternatives,
but we need to be wrapping things up. (we also need that other document
you were working on.)
    
at some point the iesg is going to ask what we've done for them *lately*,
and right now, markus and i don't have much of a response.
    
thanks!
    
/mtr


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From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES WG <ietf-openproxy@imc.org>
Subject: OCP Core version head_sid14 available
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This is a minor release. The log of major changes is quoted below. The
latest snapshot is at

	http://www.measurement-factory.com/tmp/opes/

Please continue to comment and work on the to-do list.

Thank you,

Alex.

-------------- change log ----------------

Appendix B. Change Log

  * Documented known resource-exhaustion security risks.

  * Polished compliance definition. Avoid two levels of compliance.



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From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES WG <ietf-openproxy@imc.org>
Subject: IAB Treatment version head_sid14 available
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Here is a revision of the "IAB Treatment" draft, as promissed. I have
added a couple of examples as requested by Markus. I may also found a
way to reduce the level contravercy related to the IP Addressing
consideration. I hope this major change and other minor edits will
help address some of the Hilarie concerns, but I am sure more work
will be needed as we get more specific feedback.

While the current draft is sufficiently self-consistent IMO, there is
a lot of work still needed in other drafts to make "IAB treatment"
references valid. It would be nice to get a nod from IAB/IESG
regarding our current direction (based on the "IAB treatment" draft)
before we spent time documenting specific details (e.g., OPES-Via
header format for HTTP). We need to get WG consensus first, of course.

The log of major changes is quoted below. The latest snapshot,
including XML sources for those doing hands-on modifications, is
available at

	http://www.measurement-factory.com/tmp/opes/

Please comment.

Thank you,

Alex.

-------------- change log ----------------

 head-sid14

  *  Rewrote the Introduction to the IP addressing consideration.
     Do NOT explain how IAB considerations, if interpreted literary,
     do not satisfy important real-world constraints. Instead, use
     the "chain of OPES intermediaries" exception introduced by IAB
     itself to show that OPES architecture addresses IAB concerns as
     long as the "chain" is defined/formed for a given application
     message rather than being a statically configured application
     routing table of sorts. IAB had to add the "chain" exception to
     cover one of the most obvious real-world usage scenario. We use
     the very same exception to cover all usage scenarios we care
     about.

  *  Polished text explaining the differences between tracing and
     notification mechanisms.

  *  Added examples of OPES/HTTP traces.

  *  Be careful not to imply that all OPES intermediaries must obey
     bypass instructions. Bypass should be ignored when no non-OPES
     version of the content exists. Ideally, this may need to be
     polished further -- if there is no non-OPES version of the
     content, most IAB considerations probably do not apply because
     there is really no adaptation, only creation of content (and we
     should not restrict content creation).

  *  Added references to OPES "Communications" draft
     [I-D.ietf-opes-end-comm].


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From: "MITTIG Karel FTRD/DMI/CAE" <karel.mittig@rd.francetelecom.com>
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Hello,

I'm actually working on a generic OCP implementation for a later adaptati=
on to DNS services. In this context, I have several comments on actual dr=
aft, which I hope will help you to clarify or modify it:

DUM=3D>'as-is'
--------------
"as-is" includes an "am-id" parameter. What is the range of this am-id: A=
M session or Transaction ? If it's only available in current AM session, =
why using it when it's already present in DUM anonymous parameters ?

DUM=3D>'ack'
--------------
DUM 'ack' can be send by both processor and callout server, but DACK mess=
ages can only be send by callout server. Draft modification needed to mak=
e DACK sendable by both ?

DH:
--------------
First draft version was including DH message, which has been removed in t=
he last version (replaced by ack flag in DUM message as I understand). Ho=
wever, several parts of the draft still refer to DH:
	-DACK
 	-Adapted dataflow definition
	-Message Examples
=09

DACK
--------------
DACK description speak about a "please-ack" parameter which is not define=
d anywhere else. Also, the aim of "wont-forward" parameter is not clear t=
o me. If it's only used to terminate preservation commitment, why not re-=
using the "wont-use" parameter ?

PONG/PING
--------------
rid named parameter =3D> obsolete ?
Name of [xid[am-id]] named parameter is not defined


NO/NR
--------------
ocp core draft defines anonymous parameters as a list of features(=A78.13=
), while HTTP adaptation uses a list of services(=A78.4) instead. Which o=
ne is right ? :-)
In NR, named parameters "Rejects" (which is normally indicated by omittin=
g the "feature" parameter) & "Unknowns" are not defined.


FLAGS
--------------
"flag" named-parameters (error, ack & wont-forward) type is not clear. No=
rmally, it should be boolean ("0"/"1", correct ?) but this is not explici=
tly defined.

Data syntax
--------------
Result parameter is defined like for example {200 "2:OK"}. However, Marti=
n presents on his OCP sample a {200 OK} result. Is it an error or are bot=
h solutions possible ? If true, it will need useless syntax checks, intro=
duce possible errors in implementation and should be avoid (in my opinion=
).=20
Named parameters use indifferently lowercase or uppercase ("Kept", "modp"=
,"Error", "sizep"). Knowing that the protocol is case-sensitive, it would=
 be clearer to use the same nomenclature for all parameters (everything i=
n lowercase for example).



Last point is about processor management of server "adapted" data, using =
processing points defined in "draft-beck-opes-irml" (adding maybe 2 more =
points corresponding to processor core treatments between 1->2 and 3->4).
My idea is to add an optional parameter in DUM message (something like [n=
ext-processing-point: value]). Receiving this parameter, processor SHOULD=
 transmit adapted message to given processing point.

This will allow for example a filtering service to tell the processor (a =
proxy in this case) to directly answer to a client with a denied message =
(with or without allowing processor to cache the answer), or another serv=
ice to tell the processor (server or proxy in this case) to get another c=
ontent instead of the one provided in the answer, etc.


Regards,

Karel
[France Telecom R&D ]




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Alex Rousskov wrote:

> While the current draft is sufficiently self-consistent IMO, there is
> a lot of work still needed in other drafts to make "IAB treatment"
> references valid. It would be nice to get a nod from IAB/IESG
> regarding our current direction (based on the "IAB treatment" draft)
> before we spent time documenting specific details (e.g., OPES-Via
> header format for HTTP). We need to get WG consensus first, of course.

Folks - plase provide comments on this new version of the draft by 
Thursday, 8/28. We would then try to get feedback from IAB/IESG on the 
direction of the draft.

Thanks,
   Markus



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Date: Mon, 25 Aug 2003 09:56:33 -0600 (MDT)
From: Alex Rousskov <rousskov@measurement-factory.com>
To: MITTIG Karel FTRD/DMI/CAE <karel.mittig@rd.francetelecom.com>
cc: ietf-openproxy@imc.org
Subject: Re: draft-ietf-opes-ocp-core
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On Mon, 25 Aug 2003, MITTIG Karel FTRD/DMI/CAE wrote:

> I'm actually working on a generic OCP implementation for a later
> adaptation to DNS services. In this context, I have several comments
> on actual draft, which I hope will help you to clarify or modify it:

Glad to see more people interested in OCP and appreciate your
comments! Detailed responses are below.

> DUM=3D>'as-is'
> --------------
>
> "as-is" includes an "am-id" parameter. What is the range of this
> am-id: AM session or Transaction ? If it's only available in current
> AM session, why using it when it's already present in DUM anonymous
> parameters ?

Anonymous am-id parameter of DUM message identifies the _adapted_
application message within the transaction. There may be several
adapted application messages within a single transaction for protocols
such as SMTP. Am-id field of the "as-is" parameter identifies the
_original_ application message within the transaction.

For now, there can be only one original application message within a
transaction, but that might change. Even if it never changes, it's
good to keep original am-id in the protocol to keep original and
adapted data messages symmetric (IMO).

Do the above statements answer your questions?

> DUM=3D>'ack'
> --------------
>
> DUM 'ack' can be send by both processor and callout server, but DACK
> messages can only be send by callout server. Draft modification
> needed to make DACK sendable by both ?

I think you are right. Data acknowledgment mechanism should be
symmetric. Added to the to-do list.

BTW, I suspect it would be better to make the mechanism more universal
so that any message can be acknowledged, not just DUM. We already have
a problem with DUY messages that cannot be acknowledged. Unless I hear
objections or better ideas, I will try to make the acknowledgment
mechanism work with any OCP message.

> DH:
> --------------
>
> First draft version was including DH message, which has been removed
> in the last version (replaced by ack flag in DUM message as I
> understand). However, several parts of the draft still refer to DH:
>
> 	-DACK
>  	-Adapted dataflow definition
> 	-Message Examples

Indeed. The next draft version should have all DH references replaced
with DUM. Please let me know if you find more leftovers after the next
release. It is mostly a text management issue -- I still need to find
a way to use some kind of XML placeholders with xml2rfc instead of
actual message names, to better track name usage and reduce renaming
problems.


> DACK
> --------------
>
> DACK description speak about a "please-ack" parameter which is not
> defined anywhere else. Also, the aim of "wont-forward" parameter is
> not clear to me. If it's only used to terminate preservation
> commitment, why not re-using the "wont-use" parameter ?

Renamed "DUM.please-ack" in DACK description to "DUM.ack".

Note that wont-use has a very different semantics: The ack parameter
of a DUM message asks the recipient to acknowledge that the message
has been received. The wont-use parameter informs OPES processor that
a portion of the original data kept at the processor will not be used
by the callout service (and, hence, does not need to be kept any
longer).


> PONG/PING
> --------------
> rid named parameter =3D> obsolete ?

Removed for now. I think we may need it later, but it is possible that
we can merge the ping/pong and DACK mechanisms together and remove at
least one of the ping/pong messages. See above comments regarding DACK
future.

> Name of [xid[am-id]] named parameter is not defined

These will be anonymous parameters in the next draft release.

> NO/NR
> --------------
>
> ocp core draft defines anonymous parameters as a list of
> features(=A78.13), while HTTP adaptation uses a list of services(=A78.4=
)
> instead. Which one is right ? :-)

Both are correct, in principle. A "feature" is a generic mechanism
that HTTP uses to negotiate "services". In other words, "service" is
one of the "features" that can be negotiated.

> In NR, named parameters "Rejects" (which is normally indicated by
> omitting the "feature" parameter) & "Unknowns" are not defined.

Will document for the next release:

   When accepting or rejecting an offer, the sender of the NR message
   MAY supply additional details via Rejects and Unknowns parameters.
   The Rejects parameter can be used to list features that were known to
   the NO recipient but could not be supported given negotiated state
   that existed when NO message was received. The Unknowns parameter can
   be used to list features that were unknown to the NO recipient.

Note that even a positive NR response may have rejects and unknowns.

> FLAGS
> --------------
>
> "flag" named-parameters (error, ack & wont-forward) type is not
> clear. Normally, it should be boolean ("0"/"1", correct ?) but this
> is not explicitly defined.

True. Added to the to-do list. "0"/"1" would work. An alternative is
to say that a present flag name means "true" and an absent flag means
"false" (and have no value when the name is present).

> Data syntax
> --------------
>
> Result parameter is defined like for example {200 "2:OK"}. However,
> Martin presents on his OCP sample a {200 OK} result. Is it an error
> or are both solutions possible ? If true, it will need useless
> syntax checks, introduce possible errors in implementation and
> should be avoid (in my opinion).

{200 "2:OK"} is correct, {200 OK} is wrong, IMO. Both are
syntactically valid, but we need to make it clear somewhere that only
one form is valid because "OK" is a string, not a token.

> Named parameters use indifferently lowercase or uppercase ("Kept",
> "modp","Error", "sizep"). Knowing that the protocol is
> case-sensitive, it would be clearer to use the same nomenclature for
> all parameters (everything in lowercase for example).

Yes. I think we are quite consistent with message names, but named
parameters need more work. Use named constants rather than hard-coded
strings in your code :-).

> Last point is about processor management of server "adapted" data,
> using processing points defined in "draft-beck-opes-irml" (adding
> maybe 2 more points corresponding to processor core treatments
> between 1->2 and 3->4).
>
> My idea is to add an optional parameter in DUM message (something
> like [next-processing-point: value]). Receiving this parameter,
> processor SHOULD transmit adapted message to given processing point.

I am not very fond of the "processing points" approach because it is
very rigid and application-specific. Some application/protocols may
not have processing points (have one processing point). Some protocols
may have processing points that are not appropriate to enumerate as
integers or that change dynamically.

And perhaps more importantly, it seems wrong for the callout service
to tell processor which processing point to use next -- even if the
callout service knows a lot about processing points at the processor,
it cannot know whether adapted data it returns has to go through some
more adaptations before being directed to a given processing point.

> This will allow for example a filtering service to tell the
> processor (a proxy in this case) to directly answer to a client with
> a denied message (with or without allowing processor to cache the
> answer), or another service to tell the processor (server or proxy
> in this case) to get another content instead of the one provided in
> the answer, etc.

I do agree that supporting service-generated responses to client
requests is a MUST-have for HTTP adaptations. I hope we can do that
using application message parts concept (AM-Part): if processor is
receiving response parts when adapting a request, it would know that
the service is generating a response and would route that response
accordingly. Would that approach work well for you?


Thanks again for your comments and bug reports,

Alex.




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Subject: RE : draft-ietf-opes-ocp-core
Date: Tue, 26 Aug 2003 15:17:51 +0200
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Thread-Topic: draft-ietf-opes-ocp-core
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From: "MITTIG Karel FTRD/DMI/CAE" <karel.mittig@rd.francetelecom.com>
To: "Alex Rousskov" <rousskov@measurement-factory.com>
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Alex,

Thanks for these usefull precisions.

Just about AM-part and processing points: I didn't thought about AM-part,=
 but yes, it could match my need (even if it's need adaptation to DNS pro=
tocol to limit overhead).

However, I think we need at least a way to tell the processor if it's all=
owed or not to cache specific adapted data.

One example to explicit my need: having a filtering service, you may want=
 unfiltered content (for any client profil) to be cached by the processor=
 after the server call (to reduce load on this server), so the server has=
 to be called before the processor cache mecanism. However, you will want=
 potentially filtered content and corresponding adapted data not to be ca=
ched because it will be managed by specific server policy.

So I suggest introducing at least an optionnal flag in DUM message tellin=
g processor not to cache the answer.

Regards,

Karel








> -----Message d'origine-----
> De : Alex Rousskov [mailto:rousskov@measurement-factory.com]
> Envoy=E9 : lundi 25 ao=FBt 2003 17:57
> =C0 : MITTIG Karel FTRD/DMI/CAE
> Cc : ietf-openproxy@imc.org
> Objet : Re: draft-ietf-opes-ocp-core
>=20
>=20
>=20
> On Mon, 25 Aug 2003, MITTIG Karel FTRD/DMI/CAE wrote:
>=20
> > I'm actually working on a generic OCP implementation for a later
> > adaptation to DNS services. In this context, I have several=20
> comments
> > on actual draft, which I hope will help you to clarify or modify it:
>=20
> Glad to see more people interested in OCP and appreciate your
> comments! Detailed responses are below.
>=20
> > DUM=3D>'as-is'
> > --------------
> >
> > "as-is" includes an "am-id" parameter. What is the range of this
> > am-id: AM session or Transaction ? If it's only available
> in current
> > AM session, why using it when it's already present in DUM anonymous
> > parameters ?
>=20
> Anonymous am-id parameter of DUM message identifies the
> _adapted_ application message within the transaction. There=20
> may be several adapted application messages within a single=20
> transaction for protocols such as SMTP. Am-id field of the=20
> "as-is" parameter identifies the _original_ application=20
> message within the transaction.
>=20
> For now, there can be only one original application message
> within a transaction, but that might change. Even if it never=20
> changes, it's good to keep original am-id in the protocol to=20
> keep original and adapted data messages symmetric (IMO).
>=20
> Do the above statements answer your questions?
>=20
> > DUM=3D>'ack'
> > --------------
> >
> > DUM 'ack' can be send by both processor and callout server,
> but DACK
> > messages can only be send by callout server. Draft
> modification needed
> > to make DACK sendable by both ?
>=20
> I think you are right. Data acknowledgment mechanism should
> be symmetric. Added to the to-do list.
>=20
> BTW, I suspect it would be better to make the mechanism more
> universal so that any message can be acknowledged, not just=20
> DUM. We already have a problem with DUY messages that cannot=20
> be acknowledged. Unless I hear objections or better ideas, I=20
> will try to make the acknowledgment mechanism work with any=20
> OCP message.
>=20
> > DH:
> > --------------
> >
> > First draft version was including DH message, which has
> been removed
> > in the last version (replaced by ack flag in DUM message as I
> > understand). However, several parts of the draft still refer to DH:
> >
> > 	-DACK
> >  	-Adapted dataflow definition
> > 	-Message Examples
>=20
> Indeed. The next draft version should have all DH references
> replaced with DUM. Please let me know if you find more=20
> leftovers after the next release. It is mostly a text=20
> management issue -- I still need to find a way to use some=20
> kind of XML placeholders with xml2rfc instead of actual=20
> message names, to better track name usage and reduce renaming=20
> problems.
>=20
>=20
> > DACK
> > --------------
> >
> > DACK description speak about a "please-ack" parameter which is not
> > defined anywhere else. Also, the aim of "wont-forward" parameter is=20
> > not clear to me. If it's only used to terminate preservation=20
> > commitment, why not re-using the "wont-use" parameter ?
>=20
> Renamed "DUM.please-ack" in DACK description to "DUM.ack".
>=20
> Note that wont-use has a very different semantics: The ack
> parameter of a DUM message asks the recipient to acknowledge=20
> that the message has been received. The wont-use parameter=20
> informs OPES processor that a portion of the original data=20
> kept at the processor will not be used by the callout service=20
> (and, hence, does not need to be kept any longer).
>=20
>=20
> > PONG/PING
> > --------------
> > rid named parameter =3D> obsolete ?
>=20
> Removed for now. I think we may need it later, but it is
> possible that we can merge the ping/pong and DACK mechanisms=20
> together and remove at least one of the ping/pong messages.=20
> See above comments regarding DACK future.
>=20
> > Name of [xid[am-id]] named parameter is not defined
>=20
> These will be anonymous parameters in the next draft release.
>=20
> > NO/NR
> > --------------
> >
> > ocp core draft defines anonymous parameters as a list of
> > features(=A78.13), while HTTP adaptation uses a list of=20
> services(=A78.4)
> > instead. Which one is right ? :-)
>=20
> Both are correct, in principle. A "feature" is a generic
> mechanism that HTTP uses to negotiate "services". In other=20
> words, "service" is one of the "features" that can be negotiated.
>=20
> > In NR, named parameters "Rejects" (which is normally indicated by
> > omitting the "feature" parameter) & "Unknowns" are not defined.
>=20
> Will document for the next release:
>=20
>    When accepting or rejecting an offer, the sender of the NR message
>    MAY supply additional details via Rejects and Unknowns parameters.
>    The Rejects parameter can be used to list features that
> were known to
>    the NO recipient but could not be supported given negotiated state
>    that existed when NO message was received. The Unknowns=20
> parameter can
>    be used to list features that were unknown to the NO recipient.
>=20
> Note that even a positive NR response may have rejects and unknowns.
>=20
> > FLAGS
> > --------------
> >
> > "flag" named-parameters (error, ack & wont-forward) type is
> not clear.
> > Normally, it should be boolean ("0"/"1", correct ?) but this is not
> > explicitly defined.
>=20
> True. Added to the to-do list. "0"/"1" would work. An
> alternative is to say that a present flag name means "true"=20
> and an absent flag means "false" (and have no value when the=20
> name is present).
>=20
> > Data syntax
> > --------------
> >
> > Result parameter is defined like for example {200 "2:OK"}. However,
> > Martin presents on his OCP sample a {200 OK} result. Is it=20
> an error or
> > are both solutions possible ? If true, it will need useless syntax
> > checks, introduce possible errors in implementation and should be=20
> > avoid (in my opinion).
>=20
> {200 "2:OK"} is correct, {200 OK} is wrong, IMO. Both are
> syntactically valid, but we need to make it clear somewhere=20
> that only one form is valid because "OK" is a string, not a token.
>=20
> > Named parameters use indifferently lowercase or uppercase ("Kept",
> > "modp","Error", "sizep"). Knowing that the protocol is=20
> case-sensitive,
> > it would be clearer to use the same nomenclature for all parameters
> > (everything in lowercase for example).
>=20
> Yes. I think we are quite consistent with message names, but
> named parameters need more work. Use named constants rather=20
> than hard-coded strings in your code :-).
>=20
> > Last point is about processor management of server "adapted" data,
> > using processing points defined in "draft-beck-opes-irml" (adding=20
> > maybe 2 more points corresponding to processor core=20
> treatments between
> > 1->2 and 3->4).
> >
> > My idea is to add an optional parameter in DUM message
> (something like
> > [next-processing-point: value]). Receiving this parameter,
> processor
> > SHOULD transmit adapted message to given processing point.
>=20
> I am not very fond of the "processing points" approach
> because it is very rigid and application-specific. Some=20
> application/protocols may not have processing points (have=20
> one processing point). Some protocols may have processing=20
> points that are not appropriate to enumerate as integers or=20
> that change dynamically.
>=20
> And perhaps more importantly, it seems wrong for the callout
> service to tell processor which processing point to use next=20
> -- even if the callout service knows a lot about processing=20
> points at the processor, it cannot know whether adapted data=20
> it returns has to go through some more adaptations before=20
> being directed to a given processing point.
>=20
> > This will allow for example a filtering service to tell the
> processor
> > (a proxy in this case) to directly answer to a client with a denied
> > message (with or without allowing processor to cache the=20
> answer), or
> > another service to tell the processor (server or proxy in
> this case)
> > to get another content instead of the one provided in the
> answer, etc.
>=20
> I do agree that supporting service-generated responses to
> client requests is a MUST-have for HTTP adaptations. I hope=20
> we can do that using application message parts concept=20
> (AM-Part): if processor is receiving response parts when=20
> adapting a request, it would know that the service is=20
> generating a response and would route that response=20
> accordingly. Would that approach work well for you?
>=20
>=20
> Thanks again for your comments and bug reports,
>=20
> Alex.
>=20
>=20



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cc: ietf-openproxy@imc.org
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On Tue, 26 Aug 2003, MITTIG Karel FTRD/DMI/CAE wrote:

> However, I think we need at least a way to tell the processor if
> it's allowed or not to cache specific adapted data.
>
> One example to explicit my need: having a filtering service, you may
> want unfiltered content (for any client profil) to be cached by the
> processor after the server call (to reduce load on this server), so
> the server has to be called before the processor cache mecanism.
> However, you will want potentially filtered content and
> corresponding adapted data not to be cached because it will be
> managed by specific server policy.
>
> So I suggest introducing at least an optionnal flag in DUM message
> telling processor not to cache the answer.

I agree that cache control is a desirable feature in many
environments. There are several related observations:

	- Some application protocols to not support the
	  notion of caching (e.g., SMTP).

	- Application protocols that support caching
	  usually have built-in caching controls (e.g.,
	  Cache-Control header in HTTP). These controls
	  are often quite sophisticated.

It looks to me that adding cache control features to OCP Core would be
wrong because some protocols do not have a notion of caching at all,
and those protocols that do already have extensive controls that OCP
Core would not be able to duplicate in a generic manner.

How about this:

	- Let OCP application bindings handle cache control
	  issue.

	- Recommend that an application binding relies
	  on existing application controls rather than
	  extend OCP.

Would that address your needs, including the filtering example you
gave above? Can the filter service alter Cache-Control headers of the
filtered responses appropriately?

Thanks,

Alex.


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Subject: RE : RE : draft-ietf-opes-ocp-core
Date: Tue, 26 Aug 2003 19:10:54 +0200
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From: "MITTIG Karel FTRD/DMI/CAE" <karel.mittig@rd.francetelecom.com>
To: "Alex Rousskov" <rousskov@measurement-factory.com>
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Altering the cache control header will work, but it could lead to side
effects.

If you take the case when service's clients are subnetworks or enterprise=
s
with proxies on it, they wont be able to cache the response any more.
In the same way, client application can respect too closely zero TTL and
re-send request very frequently.
Result will then be an increased load on your processor, and the benefits
of caching unfiltered content will be loss.

But you're right, the problem is specific to some application protocols
(and also some cases), so it can be address in application bindings.

Karel





> De : Alex Rousskov
> Envoy=E9 : mardi 26 ao=FBt 2003 17:06
> =C0 : MITTIG Karel FTRD/DMI/CAE
> Cc : ietf-openproxy@imc.org
> Objet : Re: RE : draft-ietf-opes-ocp-core
>=20
>=20
>=20
> I agree that cache control is a desirable feature in many=20
> environments. There are several related observations:
>=20
> 	- Some application protocols to not support the
> 	  notion of caching (e.g., SMTP).
>=20
> 	- Application protocols that support caching
> 	  usually have built-in caching controls (e.g.,
> 	  Cache-Control header in HTTP). These controls
> 	  are often quite sophisticated.
>=20
> It looks to me that adding cache control features to OCP Core=20
> would be wrong because some protocols do not have a notion of=20
> caching at all, and those protocols that do already have=20
> extensive controls that OCP Core would not be able to=20
> duplicate in a generic manner.
>=20
> How about this:
>=20
> 	- Let OCP application bindings handle cache control
> 	  issue.
>=20
> 	- Recommend that an application binding relies
> 	  on existing application controls rather than
> 	  extend OCP.
>=20
> Would that address your needs, including the filtering=20
> example you gave above? Can the filter service alter=20
> Cache-Control headers of the filtered responses appropriately?
>=20
> Thanks,
>=20
> Alex.
>=20



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From: =?iso-8859-1?q?Red=20K?= <redkresearch@yahoo.com.sg>
Subject: is there OPES prototype proxy?
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Hi,

It is an fresh man's topic.
But I still want to know if there is any prototype
OPES proxy that supports Proxylet Local Execution
Environment Java Binding V0.1. Thus I can develope my
proxylet because I am interested in OPES.

Thank you very much.

Red K


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On Wed, 27 Aug 2003, [iso-8859-1] Red K wrote:

> It is an fresh man's topic. But I still want to know if there is any
> prototype OPES proxy that supports Proxylet Local Execution
> Environment Java Binding V0.1. Thus I can develope my proxylet
> because I am interested in OPES.

I am working on a prototype OPES proxy. It almost talks OCP to a
prototype callout service being developed by Martin Stecher. There is
no proxylet support. I heard proxylets were a popular topic long time
ago, but there were no proxylets mentioned on this list for quite a
while now. If you are interested in OPES, the shortest path to a
working system may be to write a callout server that speaks OCP. One
can write such a server in Java, of course.

HTH,

Alex.


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Subject: Re: is there OPES prototype proxy?
To: Alex Rousskov <rousskov@measurement-factory.com>
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Yes, I also mentioned that proxylet is not discussed
for a long time. But what is the reason for this? 

Is it related to system efficiency and simple
maintainance? I mean to setup one callout server is
easy to maintain and higher efficient to carry out
specific service than put them onto a single host.

 --- Alex Rousskov <rousskov@measurement-factory.com>
wrote: > 
> On Wed, 27 Aug 2003, [iso-8859-1] Red K wrote:
> 
> > It is an fresh man's topic. But I still want to
> know if there is any
> > prototype OPES proxy that supports Proxylet Local
> Execution
> > Environment Java Binding V0.1. Thus I can develope
> my proxylet
> > because I am interested in OPES.
> 
> I am working on a prototype OPES proxy. It almost
> talks OCP to a
> prototype callout service being developed by Martin
> Stecher. There is
> no proxylet support. I heard proxylets were a
> popular topic long time
> ago, but there were no proxylets mentioned on this
> list for quite a
> while now. If you are interested in OPES, the
> shortest path to a
> working system may be to write a callout server that
> speaks OCP. One
> can write such a server in Java, of course.
> 
> HTH,
> 
> Alex. 

__________________________________________________
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http://yahoo.com.sg/millionaire


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Red K wrote:

> Yes, I also mentioned that proxylet is not discussed
> for a long time. But what is the reason for this? 

Reason is that the OPES WG is chartered to specify the callout 
protocol and the rules language, but *not* a proxylet interface or a 
proxylet architecture - this would be a local implementation decision 
or standardized elsewhere.

The OPES architecture does *not* rule out proxylet, but the focus of 
the WG is on the callout mechanism.

-Markus



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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: Red K <redkresearch@yahoo.com.sg>
Cc: ietf-openproxy@imc.org
Subject: RE: is there OPES prototype proxy?
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Hi,

At this stage our charter does not focus on proxylet or how rules are loaded
to the opes processor.

Abbie

> -----Original Message-----
> From: Red K [mailto:redkresearch@yahoo.com.sg] 
> Sent: Wednesday, August 27, 2003 9:05 AM
> To: Alex Rousskov
> Cc: ietf-openproxy@imc.org
> Subject: Re: is there OPES prototype proxy?
> 
> 
> 
> Yes, I also mentioned that proxylet is not discussed
> for a long time. But what is the reason for this? 
> 
> Is it related to system efficiency and simple
> maintainance? I mean to setup one callout server is
> easy to maintain and higher efficient to carry out
> specific service than put them onto a single host.
> 
>  --- Alex Rousskov <rousskov@measurement-factory.com>
> wrote: > 
> > On Wed, 27 Aug 2003, [iso-8859-1] Red K wrote:
> > 
> > > It is an fresh man's topic. But I still want to
> > know if there is any
> > > prototype OPES proxy that supports Proxylet Local
> > Execution
> > > Environment Java Binding V0.1. Thus I can develope
> > my proxylet
> > > because I am interested in OPES.
> > 
> > I am working on a prototype OPES proxy. It almost
> > talks OCP to a
> > prototype callout service being developed by Martin
> > Stecher. There is
> > no proxylet support. I heard proxylets were a
> > popular topic long time
> > ago, but there were no proxylets mentioned on this
> > list for quite a
> > while now. If you are interested in OPES, the
> > shortest path to a
> > working system may be to write a callout server that
> > speaks OCP. One
> > can write such a server in Java, of course.
> > 
> > HTH,
> > 
> > Alex.
> 
> __________________________________________________
> Do You Yahoo!?
> Play now and stand a chance to win cash prizes! 
> http://yahoo.com.sg/millionaire
> 

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<P><FONT SIZE=2>Hi,</FONT>
</P>

<P><FONT SIZE=2>At this stage our charter does not focus on proxylet or how rules are loaded to the opes processor.</FONT>
</P>

<P><FONT SIZE=2>Abbie</FONT>
</P>

<P><FONT SIZE=2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=2>&gt; From: Red K [<A HREF="mailto:redkresearch@yahoo.com.sg">mailto:redkresearch@yahoo.com.sg</A>] </FONT>
<BR><FONT SIZE=2>&gt; Sent: Wednesday, August 27, 2003 9:05 AM</FONT>
<BR><FONT SIZE=2>&gt; To: Alex Rousskov</FONT>
<BR><FONT SIZE=2>&gt; Cc: ietf-openproxy@imc.org</FONT>
<BR><FONT SIZE=2>&gt; Subject: Re: is there OPES prototype proxy?</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Yes, I also mentioned that proxylet is not discussed</FONT>
<BR><FONT SIZE=2>&gt; for a long time. But what is the reason for this? </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Is it related to system efficiency and simple</FONT>
<BR><FONT SIZE=2>&gt; maintainance? I mean to setup one callout server is</FONT>
<BR><FONT SIZE=2>&gt; easy to maintain and higher efficient to carry out</FONT>
<BR><FONT SIZE=2>&gt; specific service than put them onto a single host.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt;&nbsp; --- Alex Rousskov &lt;rousskov@measurement-factory.com&gt;</FONT>
<BR><FONT SIZE=2>&gt; wrote: &gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; On Wed, 27 Aug 2003, [iso-8859-1] Red K wrote:</FONT>
<BR><FONT SIZE=2>&gt; &gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; &gt; It is an fresh man's topic. But I still want to</FONT>
<BR><FONT SIZE=2>&gt; &gt; know if there is any</FONT>
<BR><FONT SIZE=2>&gt; &gt; &gt; prototype OPES proxy that supports Proxylet Local</FONT>
<BR><FONT SIZE=2>&gt; &gt; Execution</FONT>
<BR><FONT SIZE=2>&gt; &gt; &gt; Environment Java Binding V0.1. Thus I can develope</FONT>
<BR><FONT SIZE=2>&gt; &gt; my proxylet</FONT>
<BR><FONT SIZE=2>&gt; &gt; &gt; because I am interested in OPES.</FONT>
<BR><FONT SIZE=2>&gt; &gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; I am working on a prototype OPES proxy. It almost</FONT>
<BR><FONT SIZE=2>&gt; &gt; talks OCP to a</FONT>
<BR><FONT SIZE=2>&gt; &gt; prototype callout service being developed by Martin</FONT>
<BR><FONT SIZE=2>&gt; &gt; Stecher. There is</FONT>
<BR><FONT SIZE=2>&gt; &gt; no proxylet support. I heard proxylets were a</FONT>
<BR><FONT SIZE=2>&gt; &gt; popular topic long time</FONT>
<BR><FONT SIZE=2>&gt; &gt; ago, but there were no proxylets mentioned on this</FONT>
<BR><FONT SIZE=2>&gt; &gt; list for quite a</FONT>
<BR><FONT SIZE=2>&gt; &gt; while now. If you are interested in OPES, the</FONT>
<BR><FONT SIZE=2>&gt; &gt; shortest path to a</FONT>
<BR><FONT SIZE=2>&gt; &gt; working system may be to write a callout server that</FONT>
<BR><FONT SIZE=2>&gt; &gt; speaks OCP. One</FONT>
<BR><FONT SIZE=2>&gt; &gt; can write such a server in Java, of course.</FONT>
<BR><FONT SIZE=2>&gt; &gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; HTH,</FONT>
<BR><FONT SIZE=2>&gt; &gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; Alex.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; __________________________________________________</FONT>
<BR><FONT SIZE=2>&gt; Do You Yahoo!?</FONT>
<BR><FONT SIZE=2>&gt; Play now and stand a chance to win cash prizes! </FONT>
<BR><FONT SIZE=2>&gt; <A HREF="http://yahoo.com.sg/millionaire" TARGET="_blank">http://yahoo.com.sg/millionaire</A></FONT>
<BR><FONT SIZE=2>&gt; </FONT>
</P>

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On Wed, 27 Aug 2003, [iso-8859-1] Red K wrote:

> Yes, I also mentioned that proxylet is not discussed
> for a long time. But what is the reason for this?
>
> Is it related to system efficiency and simple
> maintainance? I mean to setup one callout server is
> easy to maintain and higher efficient to carry out
> specific service than put them onto a single host.

I do not think that proxylets are always more or less efficient than
callout services. Same for the ease of maintenance. It all depends on
a particular environment and workload. Moreover, it is possible (if
not desirable!) to have a proxylet that communicates with the OPES
processor via OCP and, hence, is also a callout service.

Alex.

On Wed, 27 Aug 2003, Markus Hofmann wrote:

> Reason is that the OPES WG is chartered to specify the callout
> protocol and the rules language, but *not* a proxylet interface or a
> proxylet architecture - this would be a local implementation
> decision or standardized elsewhere.
>
> The OPES architecture does *not* rule out proxylet, but the focus of
> the WG is on the callout mechanism.

On Wed, 27 Aug 2003, Abbie Barbir wrote:

> At this stage our charter does not focus on proxylet or how rules
> are loaded to the opes processor.



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Subject: RE : RE : RE : draft-ietf-opes-ocp-core
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From: "MITTIG Karel FTRD/DMI/CAE" <karel.mittig@rd.francetelecom.com>
To: "Alex Rousskov" <rousskov@measurement-factory.com>
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Alex,
I think I wasn't clear in previous mail. Please see response below, I hop=
e it will better explain my need.

> -----Message d'origine-----
> De : Alex Rousskov [mailto:rousskov@measurement-factory.com]=20
> Envoy=E9 : mardi 26 ao=FBt 2003 19:31
> =C0 : MITTIG Karel FTRD/DMI/CAE
> Cc : ietf-openproxy@imc.org
> Objet : Re: RE : RE : draft-ietf-opes-ocp-core
>=20
>=20
>=20
> On Tue, 26 Aug 2003, MITTIG Karel FTRD/DMI/CAE wrote:
>=20
> > Altering the cache control header will work, but it could=20
> lead to side=20
> > effects.
> >
> > If you take the case when service's clients are subnetworks or=20
> > enterprises with proxies on it, they wont be able to cache the=20
> > response any more. In the same way, client application can=20
> respect too=20
> > closely zero TTL and re-send request very frequently.=20
> Result will then=20
> > be an increased load on your processor, and the benefits of caching=20
> > unfiltered content will be loss.
>=20
> My interpretation of the above is "application cache controls=20
> may not be able to express what a particular OPES system may=20
> want to express". For example, HTTP does not have enough=20
> knobs to control caching at intermediaries separately from=20
> caching by end clients while your OPES system wants to do=20
> just that. Is this interpretation correct?
>=20

Not exactly: my need is to be able to cache the OCP treatment applied, wh=
ich should be independent of the application protocol and application cac=
hing information. See example below.


> Can you provide a more specific example that illustrates=20
> inability of, say, HTTP Cache-Control modifications to=20
> achieve your goals?
>=20


Take an HTTP filtering service offered to 2 communities (for example high=
 and low schools using a filtering service), each passing through the OCP=
 processor. The aim of the service is to filter Internet access but with =
a different level for each community. Internet content can then be divide=
d in 3 parts:
	- the content allowed&denied only for community 1 (say [E1])
	- the content allowed&denied only for community 2 (say [E2])
	- the content allowed&denied for communities 1 and 2 (say [I])

There are 2 ways to treat the problem:
	- The "simplest" one is to say that the service is different, so you pro=
vide 2 OCP processors calling 2 services (or the same service with differ=
ent parameters). In this case, caching is not a problem, but this solutio=
n becomes costly because you double the equipments.
	- The second one is to say that the service uses a policy to know which =
treatment to apply depending of the client. In this case, there will only=
 be one processor and one service, which is far more interesting.=20

Normally, saying the processor can do HTTP caching, you will need to call=
 the service after the caching process ("response post-cache" vectoring p=
oint) to avoid the cache storing a modified version which should only be =
send to community 1 or 2. You don't have in this case to modify cache con=
trol of responses, so it works fine.

The problem with this solution is that you will query your service for ea=
ch incoming request (or indeed each outgoing response). If there are prox=
ies in one community, you will then save corresponding cached responses, =
but it will be really hard to predict the gain.

If you want to make some optimization, you can see that [I] content could=
 be cached by the processor. Or, this part can represent a lot of queries=
, saying x%, so allowing the processor to cache corresponding modified re=
sponse will save x% load on your service.

But now, if you put your service before the caching process of your proce=
ssor, the processor won't be able to distinguish between [E1]&[E2], even =
if it is able to store the 2 versions of responses, because it doesn't (a=
nd doesn't have to) know service policy. So the service has to tell proce=
ssor not to cache this part. One way is to do this as you suggested by mo=
difying the response using protocol parameters to say it is not cacheable.

The drawback in this case is that it has an impact on clients application=
s. If one community uses proxies, they wont be able to cache the response=
s any more. You will then increase the service load related to these resp=
onses to an unknown level (depending of the original TTL and the treatmen=
t required).

So the only way I see to be sure to gain those x% (which could be for som=
e services around 80%) is to add a simple "is-cacheable" flag in OCP mess=
ages (without needing extended controls like application protocols provid=
e).

Karel


> > But you're right, the problem is specific to some application=20
> > protocols (and also some cases), so it can be address in=20
> application=20
> > bindings.
>=20
> Agreed. This becomes are to-do item for HTTP OPES binding then.
>=20
> Alex.
>=20
>=20



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To: MITTIG Karel FTRD/DMI/CAE <karel.mittig@rd.francetelecom.com>
cc: ietf-openproxy@imc.org
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On Thu, 28 Aug 2003, MITTIG Karel FTRD/DMI/CAE wrote:

> Not exactly: my need is to be able to cache the OCP treatment
> applied, which should be independent of the application protocol and
> application caching information. See example below.

Thank you for providing a specific example. I think we are on the same
page as far as your requirements are concerned, but I still think your
needs can be addressed by existing HTTP cache controls. In fact, I
think we can do better than x%. Please see below.

> Take an HTTP filtering service offered to 2 communities (for example
> high and low schools using a filtering service), each passing
> through the OCP processor. The aim of the service is to filter
> Internet access but with a different level for each community.
> Internet content can then be divided in 3 parts:
>
> 	- the content allowed&denied only for community 1 (say [E1])
> 	- the content allowed&denied only for community 2 (say [E2])
> 	- the content allowed&denied for communities 1 and 2 (say [I])
>
> There are 2 ways to treat the problem:
> <snip>
>
> 	- The second one is to say that the service uses a policy to
> know which treatment to apply depending of the client. In this case,
> there will only be one processor and one service, which is far more
> interesting.
>
> Normally, saying the processor can do HTTP caching, you will need to
> call the service after the caching process ("response post-cache"
> vectoring point) to avoid the cache storing a modified version which
> should only be send to community 1 or 2. You don't have in this case
> to modify cache control of responses, so it works fine.
>
> The problem with this solution is that you will query your service
> for each incoming request (or indeed each outgoing response). If
> there are proxies in one community, you will then save corresponding
> cached responses, but it will be really hard to predict the gain.
>
> If you want to make some optimization, you can see that [I] content
> could be cached by the processor. Or, this part can represent a lot
> of queries, saying x%, so allowing the processor to cache
> corresponding modified response will save x% load on your service.
>
> But now, if you put your service before the caching process of your
> processor, the processor won't be able to distinguish between
> [E1]&[E2], even if it is able to store the 2 versions of responses,
> because it doesn't (and doesn't have to) know service policy. So the
> service has to tell processor not to cache this part. One way is to
> do this as you suggested by modifying the response using protocol
> parameters to say it is not cacheable.
>
> The drawback in this case is that it has an impact on clients
> applications. If one community uses proxies, they wont be able to
> cache the responses any more. You will then increase the service
> load related to these responses to an unknown level (depending of
> the original TTL and the treatment required).
>
> So the only way I see to be sure to gain those x% (which could be
> for some services around 80%) is to add a simple "is-cacheable" flag
> in OCP messages (without needing extended controls like application
> protocols provide).

I believe HTTP already have the mechanism that supports the above
optimization. In fact, it allows you to cache all three types of
content! The mechanism is a Vary: header. If the caching proxy
supports caching of responses with Vary: header, then OPES can use it
as follows:

	- On the pre-cache response side, OPES needs to add a
	  Vary: X-Client-Category
	  HTTP response header. This is a very "cheap"
	  modification that may even be supported by the
	  HTTP proxy itself.

	- On the request side, OPES needs to set a
	  X-Client-Category: <little_kids|high_school|general>
	  HTTP request header, with one of the three appropriate
	  header values. This is a very "cheap" modification
	  as well, because the filter needs to determine
	  client category to perform filtering checks anyway!

With the above scheme in place, the cache can store all content for
all clients. So can downstream caches. Will this work the way you want
it?

Note that you have to assume that there are no caches shared by both
communities in front of the cache in question. If there are shared
caches, neither your scheme nor Vary headers would work. Your scheme
will not work because it affects cachability at the current HTTP hop
only. My scheme will not work because all downstream requests will
have no X-Client-Category header. The only solution is then to mark
all controlled responses as uncachable using HTTP headers.

Did I miss anything?

Thanks,

Alex.


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To: jfcm <info@utel.net>, Alex Rousskov <rousskov@measurement-factory.com>
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Subject:  [end points comm] OPES System
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All,

I am Re-Reading this thread as I am working on the next version of the
draft. 
I really can not come up with a conclusion as to what the WG has decided.

Can each please resubmit thier final opnion. I will then come up with text
and put it for voting.


Abbie

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<P><FONT SIZE=2>All,</FONT>
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<P><FONT SIZE=2>I am Re-Reading this thread as I am working on the next version of the draft. </FONT>
<BR><FONT SIZE=2>I really can not come up with a conclusion as to what the WG has decided.</FONT>
</P>

<P><FONT SIZE=2>Can each please resubmit thier final opnion. I will then come up with text and put it for voting.</FONT>
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<P><FONT SIZE=2>Abbie</FONT>
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Date: Thu, 28 Aug 2003 13:36:07 -0600 (MDT)
From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES WG <ietf-openproxy@imc.org>
Subject: Re: [end points comm] OPES System
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On Thu, 28 Aug 2003, Abbie Barbir wrote:

> I am Re-Reading this thread as I am working on the next version of
> the draft.  I really can not come up with a conclusion as to what
> the WG has decided.
>
> Can each please resubmit thier final opnion. I will then come up
> with text and put it for voting.

In my opinion, all MUST-level tracing requirements must be limited to
an OPES System. We would need to define an OPES system. The current
"IAB treatment" draft (the IP Addressing section) can be used as a
starting point:

	An OPES System is a collection of OPES
	entities that is directly addressable
	on IP level by an end user.

This is just a starting point: We would need to apply the same logic
to client-side systems and polish.

SHOULD- and MAY-level tracing requirements can refer to OPES
processors, callout services, and other OPES entities. We can deal
with the exact definitions and SHOULDs later.

The primary question is whether tracing MUST be supported below the
System level. I say "no" because it is never essential for the other
side to know details of System configuration and because it is often
impractical for the System to provide such details.

Alex.



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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: ietf-openproxy@imc.org
Subject: [opes-end-comm]: What is traceable in an OPES Flow?
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Hi,

I am working my way through the tracing draft.
The next issue is section 2.1 "What is traceable in an OPES Flow?"

The section is below


  o  The data consumer application end point MUST be able to identify
      the OPES processors that have acted on an application message.

   o  The data consumer application end point SHOULD be able to identify
      OPES services (including callout services) that were performed on
      request/responses that are part of an application message.

   o  TBD

   o  TBD

   For a given trace, an OPES entity involved in handling the
   corresponding application message is "traceable" or "traced" if
   information about it appears in that trace. OPES entities have
   different levels of traceability requirements. Specifically,

   o  An OPES system MUST be traceable

   o  An OPES processor SHOULD be traceable

   o  An OPES service MAY be traceable

I need feedback from the WG on this issue. Please send your remark ASAP

Abbie

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<P><FONT SIZE=2>Hi,</FONT>
</P>

<P><FONT SIZE=2>I am working my way through the tracing draft.</FONT>
<BR><FONT SIZE=2>The next issue is section 2.1 &quot;What is traceable in an OPES Flow?&quot;</FONT>
</P>

<P><FONT SIZE=2>The section is below</FONT>
</P>
<BR>

<P><FONT SIZE=2>&nbsp; o&nbsp; The data consumer application end point MUST be able to identify</FONT>
<BR><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the OPES processors that have acted on an application message.</FONT>
</P>

<P><FONT SIZE=2>&nbsp;&nbsp; o&nbsp; The data consumer application end point SHOULD be able to identify</FONT>
<BR><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OPES services (including callout services) that were performed on</FONT>
<BR><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; request/responses that are part of an application message.</FONT>
</P>

<P><FONT SIZE=2>&nbsp;&nbsp; o&nbsp; TBD</FONT>
</P>

<P><FONT SIZE=2>&nbsp;&nbsp; o&nbsp; TBD</FONT>
</P>

<P><FONT SIZE=2>&nbsp;&nbsp; For a given trace, an OPES entity involved in handling the</FONT>
<BR><FONT SIZE=2>&nbsp;&nbsp; corresponding application message is &quot;traceable&quot; or &quot;traced&quot; if</FONT>
<BR><FONT SIZE=2>&nbsp;&nbsp; information about it appears in that trace. OPES entities have</FONT>
<BR><FONT SIZE=2>&nbsp;&nbsp; different levels of traceability requirements. Specifically,</FONT>
</P>

<P><FONT SIZE=2>&nbsp;&nbsp; o&nbsp; An OPES system MUST be traceable</FONT>
</P>

<P><FONT SIZE=2>&nbsp;&nbsp; o&nbsp; An OPES processor SHOULD be traceable</FONT>
</P>

<P><FONT SIZE=2>&nbsp;&nbsp; o&nbsp; An OPES service MAY be traceable</FONT>
</P>

<P><FONT SIZE=2>I need feedback from the WG on this issue. Please send your remark ASAP</FONT>
</P>

<P><FONT SIZE=2>Abbie</FONT>
</P>

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To: OPES WG <ietf-openproxy@imc.org>
Subject: [end points comm] Section : 7.4 Tracing scenarios and examples: N
	eed volunteers for the text
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All,
 
I need volunteers to help in supplying text for section 7.4 Tracing
scenarios and examples. 
 
 
It will be useful to resuse the same examples that help define OPES System (
I know about the OPES Domain story, but I did not bite yet...)
 
 
Abbie
 

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<DIV><SPAN class=015465619-28082003><FONT face=Tahoma 
size=2>All,</FONT></SPAN></DIV>
<DIV><SPAN class=015465619-28082003><FONT face=Tahoma 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=015465619-28082003><FONT face=Tahoma size=2>I need volunteers 
to help in supplying text for section 7.4 Tracing scenarios and examples. 
</FONT></SPAN></DIV>
<DIV><SPAN class=015465619-28082003><FONT face=Tahoma 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=015465619-28082003><FONT face=Tahoma 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=015465619-28082003><FONT face=Tahoma size=2>It will be useful 
to resuse the same examples that help define OPES System ( I know about the OPES 
Domain story, but I did not bite yet...)</FONT></SPAN></DIV>
<DIV><SPAN class=015465619-28082003><FONT face=Tahoma 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=015465619-28082003><FONT face=Tahoma 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=015465619-28082003><FONT face=Tahoma 
size=2>Abbie</FONT></SPAN></DIV>
<DIV><SPAN class=015465619-28082003><FONT face=Tahoma 
size=2></FONT></SPAN>&nbsp;</DIV></BODY></HTML>

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Date: Thu, 28 Aug 2003 14:38:00 -0600 (MDT)
From: Alex Rousskov <rousskov@measurement-factory.com>
To: Abbie Barbir <abbieb@nortelnetworks.com>
cc: ietf-openproxy@imc.org
Subject: Re: [opes-end-comm]: What is traceable in an OPES Flow?
In-Reply-To: <87609AFB433BD5118D5E0002A52CD75406BC54C6@zcard0k6.ca.nortel.com>
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Abbie,

I would remove the entire old text you quoted and replace it with
implementation requirements:

    For a given trace, an OPES entity involved in handling the
    corresponding application message is "traceable" or "traced" if
    information about it appears in that trace. OPES entities have
    different levels of traceability requirements. Specifically,

    o  An OPES system MUST add its entry to the trace.

    o  An OPES processor SHOULD add its entry to the trace.

    o  An OPES service MAY add its entry to the trace.

    An OPES entity MAY manage trace entries of entities it
    controls(?). For example, an OPES processor may add
    and/or remove callout service entries.

The above needs further polishing of course. The main point is that we
should have specific implementation requirements in this draft, and
reduce abstract talk about what end points would like to see in the
trace. In other words, describe how to build the trace, spend less
time (and no RFC 2919 keywords!) on why we want the trace to look like
that. Make all rationale explanations clearly non-normative.

HTH,

Alex.


On Thu, 28 Aug 2003, Abbie Barbir wrote:

> Hi,
>
> I am working my way through the tracing draft.
> The next issue is section 2.1 "What is traceable in an OPES Flow?"
>
> The section is below
>
>
>   o  The data consumer application end point MUST be able to identify
>       the OPES processors that have acted on an application message.
>
>    o  The data consumer application end point SHOULD be able to identify
>       OPES services (including callout services) that were performed on
>       request/responses that are part of an application message.
>
>    o  TBD
>
>    o  TBD
>
>    For a given trace, an OPES entity involved in handling the
>    corresponding application message is "traceable" or "traced" if
>    information about it appears in that trace. OPES entities have
>    different levels of traceability requirements. Specifically,
>
>    o  An OPES system MUST be traceable
>
>    o  An OPES processor SHOULD be traceable
>
>    o  An OPES service MAY be traceable
>
> I need feedback from the WG on this issue. Please send your remark ASAP
>
> Abbie
>


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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: Alex Rousskov <rousskov@measurement-factory.com>
Cc: ietf-openproxy@imc.org
Subject: RE: [opes-end-comm]: What is traceable in an OPES Flow?
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Alex,

Agree, This is why I did the cut/Paste.

We need input from everyone here, please

Abbie


> -----Original Message-----
> From: Alex Rousskov [mailto:rousskov@measurement-factory.com] 
> Sent: Thursday, August 28, 2003 4:38 PM
> To: Barbir, Abbie [CAR:1A11:EXCH]
> Cc: ietf-openproxy@imc.org
> Subject: Re: [opes-end-comm]: What is traceable in an OPES Flow?
> 
> 
> Abbie,
> 
> I would remove the entire old text you quoted and replace it 
> with implementation requirements:
> 
>     For a given trace, an OPES entity involved in handling the
>     corresponding application message is "traceable" or "traced" if
>     information about it appears in that trace. OPES entities have
>     different levels of traceability requirements. Specifically,
> 
>     o  An OPES system MUST add its entry to the trace.
> 
>     o  An OPES processor SHOULD add its entry to the trace.
> 
>     o  An OPES service MAY add its entry to the trace.
> 
>     An OPES entity MAY manage trace entries of entities it
>     controls(?). For example, an OPES processor may add
>     and/or remove callout service entries.
> 
> The above needs further polishing of course. The main point 
> is that we should have specific implementation requirements 
> in this draft, and reduce abstract talk about what end points 
> would like to see in the trace. In other words, describe how 
> to build the trace, spend less time (and no RFC 2919 
> keywords!) on why we want the trace to look like that. Make 
> all rationale explanations clearly non-normative.
> 
> HTH,
> 
> Alex.
> 
> 
> On Thu, 28 Aug 2003, Abbie Barbir wrote:
> 
> > Hi,
> >
> > I am working my way through the tracing draft.
> > The next issue is section 2.1 "What is traceable in an OPES Flow?"
> >
> > The section is below
> >
> >
> >   o  The data consumer application end point MUST be able 
> to identify
> >       the OPES processors that have acted on an application message.
> >
> >    o  The data consumer application end point SHOULD be 
> able to identify
> >       OPES services (including callout services) that were 
> performed on
> >       request/responses that are part of an application message.
> >
> >    o  TBD
> >
> >    o  TBD
> >
> >    For a given trace, an OPES entity involved in handling the
> >    corresponding application message is "traceable" or "traced" if
> >    information about it appears in that trace. OPES entities have
> >    different levels of traceability requirements. Specifically,
> >
> >    o  An OPES system MUST be traceable
> >
> >    o  An OPES processor SHOULD be traceable
> >
> >    o  An OPES service MAY be traceable
> >
> > I need feedback from the WG on this issue. Please send your remark 
> > ASAP
> >
> > Abbie
> >
> 

------_=_NextPart_001_01C36DA4.DCFF16B8
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<TITLE>RE: [opes-end-comm]: What is traceable in an OPES Flow?</TITLE>
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<BODY>

<P><FONT SIZE=3D2>Alex,</FONT>
</P>

<P><FONT SIZE=3D2>Agree, This is why I did the cut/Paste.</FONT>
</P>

<P><FONT SIZE=3D2>We need input from everyone here, please</FONT>
</P>

<P><FONT SIZE=3D2>Abbie</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=3D2>&gt; From: Alex Rousskov [<A =
HREF=3D"mailto:rousskov@measurement-factory.com">mailto:rousskov@measure=
ment-factory.com</A>] </FONT>
<BR><FONT SIZE=3D2>&gt; Sent: Thursday, August 28, 2003 4:38 PM</FONT>
<BR><FONT SIZE=3D2>&gt; To: Barbir, Abbie [CAR:1A11:EXCH]</FONT>
<BR><FONT SIZE=3D2>&gt; Cc: ietf-openproxy@imc.org</FONT>
<BR><FONT SIZE=3D2>&gt; Subject: Re: [opes-end-comm]: What is traceable =
in an OPES Flow?</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Abbie,</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; I would remove the entire old text you quoted =
and replace it </FONT>
<BR><FONT SIZE=3D2>&gt; with implementation requirements:</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; For a given trace, an =
OPES entity involved in handling the</FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; corresponding =
application message is &quot;traceable&quot; or &quot;traced&quot; =
if</FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; information about it =
appears in that trace. OPES entities have</FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; different levels of =
traceability requirements. Specifically,</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; o&nbsp; An OPES system =
MUST add its entry to the trace.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; o&nbsp; An OPES =
processor SHOULD add its entry to the trace.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; o&nbsp; An OPES service =
MAY add its entry to the trace.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; An OPES entity MAY =
manage trace entries of entities it</FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; controls(?). For =
example, an OPES processor may add</FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp; and/or remove callout =
service entries.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; The above needs further polishing of course. =
The main point </FONT>
<BR><FONT SIZE=3D2>&gt; is that we should have specific implementation =
requirements </FONT>
<BR><FONT SIZE=3D2>&gt; in this draft, and reduce abstract talk about =
what end points </FONT>
<BR><FONT SIZE=3D2>&gt; would like to see in the trace. In other words, =
describe how </FONT>
<BR><FONT SIZE=3D2>&gt; to build the trace, spend less time (and no RFC =
2919 </FONT>
<BR><FONT SIZE=3D2>&gt; keywords!) on why we want the trace to look =
like that. Make </FONT>
<BR><FONT SIZE=3D2>&gt; all rationale explanations clearly =
non-normative.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; HTH,</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Alex.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; On Thu, 28 Aug 2003, Abbie Barbir wrote:</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; Hi,</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; I am working my way through the tracing =
draft.</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; The next issue is section 2.1 &quot;What =
is traceable in an OPES Flow?&quot;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; The section is below</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp; o&nbsp; The data consumer =
application end point MUST be able </FONT>
<BR><FONT SIZE=3D2>&gt; to identify</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the =
OPES processors that have acted on an application message.</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp; o&nbsp; The data =
consumer application end point SHOULD be </FONT>
<BR><FONT SIZE=3D2>&gt; able to identify</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OPES =
services (including callout services) that were </FONT>
<BR><FONT SIZE=3D2>&gt; performed on</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
request/responses that are part of an application message.</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp; o&nbsp; TBD</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp; o&nbsp; TBD</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp; For a given trace, an =
OPES entity involved in handling the</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp; corresponding =
application message is &quot;traceable&quot; or &quot;traced&quot; =
if</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp; information about it =
appears in that trace. OPES entities have</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp; different levels of =
traceability requirements. Specifically,</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp; o&nbsp; An OPES system =
MUST be traceable</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp; o&nbsp; An OPES =
processor SHOULD be traceable</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;&nbsp;&nbsp;&nbsp; o&nbsp; An OPES service =
MAY be traceable</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; I need feedback from the WG on this issue. =
Please send your remark </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; ASAP</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; Abbie</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
</P>

</BODY>
</HTML>
------_=_NextPart_001_01C36DA4.DCFF16B8--


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Subject: Re: [opes-end-comm]: What is traceable in an OPES Flow?
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Cute and approved with some questions.

At 22:38 28/08/03, Alex Rousskov wrote:
>I would remove the entire old text you quoted and replace it with
>implementation requirements:
>
>     For a given trace, an OPES entity involved in handling the
>     corresponding application message is "traceable" or "traced" if
>     information about it appears in that trace. OPES entities have
>     different levels of traceability requirements. Specifically,
>
>     o  An OPES system MUST add its entry to the trace.

OK.

>    o  An OPES processor SHOULD add its entry to the trace.

OK.

>    o  An OPES service MAY add its entry to the trace.

OK. Would prefere SHOULD but real workd will tell.

>    An OPES entity MAY manage trace entries of entities it
>     controls(?).

?    "it will be able to authoritatively document
       the tracing queries"

>    For example, an OPES processor may add
>     and/or remove callout service entries.

"remove" or "screen"?

>The above needs further polishing of course. The main point is that we
>should have specific implementation requirements in this draft, and
>reduce abstract talk about what end points would like to see in the
>trace. In other words, describe how to build the trace, spend less
>time (and no RFC 2919 keywords!) on why we want the trace to look like
>that. Make all rationale explanations clearly non-normative.
>
>HTH,
>
>Alex.
>
>
>On Thu, 28 Aug 2003, Abbie Barbir wrote:
>
> > Hi,
> >
> > I am working my way through the tracing draft.
> > The next issue is section 2.1 "What is traceable in an OPES Flow?"
> >
> > The section is below
> >
> >
> >   o  The data consumer application end point MUST be able to identify
> >       the OPES processors that have acted on an application message.
> >
> >    o  The data consumer application end point SHOULD be able to identify
> >       OPES services (including callout services) that were performed on
> >       request/responses that are part of an application message.
> >
> >    o  TBD
> >
> >    o  TBD
> >
> >    For a given trace, an OPES entity involved in handling the
> >    corresponding application message is "traceable" or "traced" if
> >    information about it appears in that trace. OPES entities have
> >    different levels of traceability requirements. Specifically,
> >
> >    o  An OPES system MUST be traceable
> >
> >    o  An OPES processor SHOULD be traceable
> >
> >    o  An OPES service MAY be traceable
> >
> > I need feedback from the WG on this issue. Please send your remark ASAP
> >
> > Abbie
> >
>
>
>
>
>---
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Date: Fri, 29 Aug 2003 09:20:35 -0600 (MDT)
From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES WG <ietf-openproxy@imc.org>
Subject: Re: [opes-end-comm]: What is traceable in an OPES Flow?
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On Fri, 29 Aug 2003, jfcm wrote:

> >    An OPES entity MAY manage trace entries of entities it
> >     controls(?).
>
> ?    "it will be able to authoritatively document
>        the tracing queries"
>
> >    For example, an OPES processor may add
> >     and/or remove callout service entries.
>

The intent behind the above two sentences is to allow "higher level"
entities to manage traces for or on bahalf of "lower level" entities.
For example, if an OPES processor uses 100 tiny callout services, the
processor may be configured to remove all callout service entries from
the trace and just insert its own entry (to keep the trace reasonably
small). Another example is when an OPES processor knows that a callout
service does not trace itself and adds a callout service trace entry
for that service. Similarly, an OPES system may designate an OPES
processor to remove all tracing entries and ad a single system entry.

I am not sure what you mean by "documenting tracing queries". Do we
talk about "tracing queries" at all anywhere? What are they?

> "remove" or "screen"?

To me, "screen" means "looking at something with the intent to
remove". "remove" sounds more direct in this context. Perhaps I
misunderstood your question.

Thanks,

Alex.


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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Pluggable Edge Services Working Group of the IETF.

	Title		: OPES Callout Protocol Core
	Author(s)	: A. Rousskov
	Filename	: draft-ietf-opes-ocp-core-01.txt
	Pages		: 55
	Date		: 2003-8-29
	
This document specifies Open Pluggable Edge Services (OPES) Callout
Protocol (OCP). OCP is an application-agnostic protocol that
facilitates exchange of application messages between an OPES
processor and a callout server, for the purpose of adaptation of
application messages at the callout server.

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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Pluggable Edge Services Working Group of the IETF.

	Title		: OPES Treatment of IAB Considerations
	Author(s)	: A. Barbir, A. Rousskov
	Filename	: draft-ietf-opes-iab-01.txt
	Pages		: 26
	Date		: 2003-8-29
	
IETF Internet Architecture Board (IAB) expressed nine
architecture-level considerations when Open Pluggable Edge Services
(OPES) working group was being chartered at the IETF.  The working
group was chartered under the condition that IAB considerations were
addressed by the group. This document describes how OPES addresses
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Alex Rousskov wrote:

> The intent behind the above two sentences is to allow "higher level"
> entities to manage traces for or on bahalf of "lower level" entities.
> For example, if an OPES processor uses 100 tiny callout services, the
> processor may be configured to remove all callout service entries from
> the trace and just insert its own entry (to keep the trace reasonably
> small). 

It seems to me, however, that in this case, the OPES processor must 
still be able to identify those 100 tiny callout services when a user 
inquiry arrives later on. It's not sufficient just to know "yes, I did 
something to the message and a several services were executed". It's 
necessary to know exactly which services were executed. How else would 
someone be able to solve possible problems?

This should be spelled out in the document.

It might be a local matter on how this is achieved - one might decide 
to maintain the necessary state (well, I probably wouldn't opt for 
that option), or maybe the executed services get somehow 
encoded/encrypted in the trace entry itself...

-Markus



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On Fri, 22 Aug 2003, Marshall Rose wrote:

> great. if your confident with an alternative approach, put an
> initial document together and submit it. i don't want to forestall
> alternatives, but we need to be wrapping things up.

I hope to submit an alternative draft for WG review by Tuesday.

> (we also need that other document you were working on.)

It is in the IESG queue.

Alex.


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Date: Fri, 29 Aug 2003 10:35:49 -0600 (MDT)
From: Alex Rousskov <rousskov@measurement-factory.com>
To: OPES WG <ietf-openproxy@imc.org>
Subject: Re: [opes-end-comm]: What is traceable in an OPES Flow?
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On Fri, 29 Aug 2003, Markus Hofmann wrote:

> Alex Rousskov wrote:
>
> > The intent behind the above two sentences is to allow "higher
> > level" entities to manage traces for or on bahalf of "lower level"
> > entities. For example, if an OPES processor uses 100 tiny callout
> > services, the processor may be configured to remove all callout
> > service entries from the trace and just insert its own entry (to
> > keep the trace reasonably small).
>
> It seems to me, however, that in this case, the OPES processor must
> still be able to identify those 100 tiny callout services when a
> user inquiry arrives later on. It's not sufficient just to know
> "yes, I did something to the message and a several services were
> executed". It's necessary to know exactly which services were
> executed. How else would someone be able to solve possible problems?

The above is indeed desirable but on a MAY level:

	- The OPES processor may have a fixed configuration
	  so it can always answer your question without
	  any extra information in the trace.

	- The OPES processor may insert a [coded] summary
	  of the 100 services applied so that it can
	  answer your question with more (but perhaps
	  incomplete) information about 100 services.

	- The user will most likely not understand and
	  not care what those 100 tiny services are. We
	  cannot demand that every service is documented
	  sufficiently enough that every reasonable
	  human being understands what it does.

	* It is the job of the OPES processor to solve
	  problems. Let's not tell it how. It is the right
	  of the other side to complain about problems.
	  Let's give it sufficient tools to do so. What is
	  sufficient? Whatever the trace builder considers
	  sufficient (because it is the builder that is
	  responsible for decoding the trace details and
	  solving the problem)! A System MUST be traced
	  so that the other side always knows who to
	  complain, regardless of what the trace builder
	  considered "sufficient".

The first three arguments are just examples of why anything above MAY
level would not make much sense when we are talking about something as
poorly scoped as an OPES service.

The last argument is the most important one, IMO. It is the
cornerstone of what I would consider a good tracing approach in an
OPES context. The trace is a trouble ticket ready for submission to a
known address. The trace in itself is not necessarily a detailed or
clear description of what has happened.

We are not dealing with two "equal" sides communicating with one
another. Our sides have very different view of the problem domain.
Let's make it easy for a side to complain. Let's leave troubleshooting
specifics to the troubleshooter since there are so many different ones
that we cannot even enumerate them.

> This should be spelled out in the document.

Yes, of course, but that's Abbie's job :-).

> It might be a local matter on how this is achieved - one might
> decide to maintain the necessary state (well, I probably wouldn't
> opt for that option), or maybe the executed services get somehow
> encoded/encrypted in the trace entry itself...

Exactly.

Alex.



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--MIMEStream=_0+32216_905313217420027_2724005518

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Pluggable Edge Services Working Group of the IETF.

	Title		: OPES Callout Protocol Core
	Author(s)	: A. Rousskov
	Filename	: draft-ietf-opes-ocp-core-01.txt
	Pages		: 55
	Date		: 2003-8-29
	
This document specifies Open Pluggable Edge Services (OPES) Callout
Protocol (OCP). OCP is an application-agnostic protocol that
facilitates exchange of application messages between an OPES
processor and a callout server, for the purpose of adaptation of
application messages at the callout server.

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Hi,

in addition to the points Abbie already mentioned, we also need to 
discuss the notion of having optional notifications being sent - This 
was something briefly mentioned at the Vienna meeting.

We already agreed that notifications should *not* be sent per default 
per message (scalability problems - notification aggregation was 
mentioned as possible approach to overcome this).

An idea might be to specify sort of a flag that would allow endpoints 
to signal that they want to receive an explicit notification if an 
OPES service is applied to this specific message. This would allow 
endpoints to do some (random?) probes. The flag could possibly also 
include how the notification should be sent (e.g. via email, or by 
issuing an HTTP request, or....)

Any thoughts?

-Markus


 > Hi,
 >
 > I am working my way through the tracing draft.
 > The next issue is section 2.1 "What is traceable in an OPES Flow?"
 >
 > The section is below
 >
 >
 >   o  The data consumer application end point MUST be able to identify
 >       the OPES processors that have acted on an application message.
 >
 >    o  The data consumer application end point SHOULD be able to 
identify
 >       OPES services (including callout services) that were performed on
 >       request/responses that are part of an application message.
 >
 >    o  TBD
 >
 >    o  TBD
 >
 >    For a given trace, an OPES entity involved in handling the
 >    corresponding application message is "traceable" or "traced" if
 >    information about it appears in that trace. OPES entities have
 >    different levels of traceability requirements. Specifically,
 >
 >    o  An OPES system MUST be traceable
 >
 >    o  An OPES processor SHOULD be traceable
 >
 >    o  An OPES service MAY be traceable
 >
 > I need feedback from the WG on this issue. Please send your remark ASAP
 >
 > Abbie
 >



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> > great. if your confident with an alternative approach, put an
> > initial document together and submit it. i don't want to forestall
> > alternatives, but we need to be wrapping things up.
> 
> I hope to submit an alternative draft for WG review by Tuesday.

good.


> > (we also need that other document you were working on.)
> 
> It is in the IESG queue.

IESG queue? i don't think so. you meant to say that you sent it to the I-D
repository, right?

/mtr


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On Fri, 29 Aug 2003, Markus Hofmann wrote:

> in addition to the points Abbie already mentioned, we also need to
> discuss the notion of having optional notifications being sent -
> This was something briefly mentioned at the Vienna meeting.
>
> We already agreed that notifications should *not* be sent per
> default per message (scalability problems - notification aggregation
> was mentioned as possible approach to overcome this).
>
> An idea might be to specify sort of a flag that would allow
> endpoints to signal that they want to receive an explicit
> notification if an OPES service is applied to this specific message.
> This would allow endpoints to do some (random?) probes. The flag
> could possibly also include how the notification should be sent
> (e.g. via email, or by issuing an HTTP request, or....)

We can say that the value of this optional flag/field is a URI that
identifies notification method plus parameters. If a processor
understands the method, it would be able to further decode the field
and send a notification. This way, we only have to document the field
name and format for ever application protocol. We do not have to
invent the notification protocol. For example, we can document the
following HTTP header:

	OPES-Notify: URI *(pname=pvalue)

On the other hand, the utility of the above approach is going to be
rather low. An alternative is for whoever writes the notification
protocol is to document the above approach OR invent its own, specific
to that protocol. For example,

	My-OPES-Notify: foo=bar q=0.5

(which simply moves URI standardization problem to the header name
standardization problem).

HTH,

Alex.


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From: Alex Rousskov <rousskov@measurement-factory.com>
To: Marshall Rose <mrose@dbc.mtview.ca.us>
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On Fri, 29 Aug 2003, Marshall Rose wrote:

> > > (we also need that other document you were working on.)
> >
> > It is in the IESG queue.
>
> IESG queue? i don't think so. you meant to say that you sent it to
> the I-D repository, right?

Probably. I just send to internet-drafts@ietf.org without knowing what
it is called. I know the reaction is not immediate or 100% automated
so I called it an IESG queue. Sorry for using the wrong term.

The drafts have been published this morning.

Thanks,

Alex.


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I'd suggest that the document includes and explains these thoughts and 
reasons - just along the lines of your comments below. It will help to 
decide whether we've consesus or not.

-Markus

Alex Rousskov wrote:

> On Fri, 29 Aug 2003, Markus Hofmann wrote:
> 
> 
>>Alex Rousskov wrote:
>>
>>
>>>The intent behind the above two sentences is to allow "higher
>>>level" entities to manage traces for or on bahalf of "lower level"
>>>entities. For example, if an OPES processor uses 100 tiny callout
>>>services, the processor may be configured to remove all callout
>>>service entries from the trace and just insert its own entry (to
>>>keep the trace reasonably small).
>>
>>It seems to me, however, that in this case, the OPES processor must
>>still be able to identify those 100 tiny callout services when a
>>user inquiry arrives later on. It's not sufficient just to know
>>"yes, I did something to the message and a several services were
>>executed". It's necessary to know exactly which services were
>>executed. How else would someone be able to solve possible problems?
> 
> 
> The above is indeed desirable but on a MAY level:
> 
> 	- The OPES processor may have a fixed configuration
> 	  so it can always answer your question without
> 	  any extra information in the trace.
> 
> 	- The OPES processor may insert a [coded] summary
> 	  of the 100 services applied so that it can
> 	  answer your question with more (but perhaps
> 	  incomplete) information about 100 services.
> 
> 	- The user will most likely not understand and
> 	  not care what those 100 tiny services are. We
> 	  cannot demand that every service is documented
> 	  sufficiently enough that every reasonable
> 	  human being understands what it does.
> 
> 	* It is the job of the OPES processor to solve
> 	  problems. Let's not tell it how. It is the right
> 	  of the other side to complain about problems.
> 	  Let's give it sufficient tools to do so. What is
> 	  sufficient? Whatever the trace builder considers
> 	  sufficient (because it is the builder that is
> 	  responsible for decoding the trace details and
> 	  solving the problem)! A System MUST be traced
> 	  so that the other side always knows who to
> 	  complain, regardless of what the trace builder
> 	  considered "sufficient".
> 
> The first three arguments are just examples of why anything above MAY
> level would not make much sense when we are talking about something as
> poorly scoped as an OPES service.
> 
> The last argument is the most important one, IMO. It is the
> cornerstone of what I would consider a good tracing approach in an
> OPES context. The trace is a trouble ticket ready for submission to a
> known address. The trace in itself is not necessarily a detailed or
> clear description of what has happened.
> 
> We are not dealing with two "equal" sides communicating with one
> another. Our sides have very different view of the problem domain.
> Let's make it easy for a side to complain. Let's leave troubleshooting
> specifics to the troubleshooter since there are so many different ones
> that we cannot even enumerate them.
> 
> 
>>This should be spelled out in the document.
> 
> 
> Yes, of course, but that's Abbie's job :-).
> 
> 
>>It might be a local matter on how this is achieved - one might
>>decide to maintain the necessary state (well, I probably wouldn't
>>opt for that option), or maybe the executed services get somehow
>>encoded/encrypted in the trace entry itself...
> 
> 
> Exactly.
> 
> Alex.
> 



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Alex Rousskov wrote:

> We can say that the value of this optional flag/field is a URI that
> identifies notification method plus parameters. If a processor
> understands the method, it would be able to further decode the field
> and send a notification. This way, we only have to document the field
> name and format for ever application protocol. We do not have to
> invent the notification protocol. 

Exactly, that's what I had in mind.

> For example, we can document the
> following HTTP header:
> 
> 	OPES-Notify: URI *(pname=pvalue)
> 
> On the other hand, the utility of the above approach is going to be
> rather low. An alternative is for whoever writes the notification
> protocol is to document the above approach OR invent its own, specific
> to that protocol. For example,
> 
> 	My-OPES-Notify: foo=bar q=0.5
> 
> (which simply moves URI standardization problem to the header name
> standardization problem).

I don't think we want to start specifying our own notification 
protocol. Using the URI option for now, but allowing someone to 
specify - if needed - a notification protocol later on might be the 
way to go.

Anyone else any thoughts? Should we include "OPES-Notify:" HTTP header 
in our OCP/HTTP bindings document?

-Markus



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On Fri, 29 Aug 2003, Markus Hofmann wrote:

> I'd suggest that the document includes and explains these thoughts
> and reasons - just along the lines of your comments below. It will
> help to decide whether we've consesus or not.

Yes, as a separate non-normative "Rationale" section or subsection.
While I do want to document our rationale, I am afraid that if it is
intermingled with normative text than people will find a mistake or a
loophole in our reasoning and will use that as a reason to violate a
related MUST. This common problem is especially dangerous when we talk
about controversial and poorly defined concepts as OPES.

Alex.


> Alex Rousskov wrote:
>
> > On Fri, 29 Aug 2003, Markus Hofmann wrote:
> >
> >
> >>Alex Rousskov wrote:
> >>
> >>
> >>>The intent behind the above two sentences is to allow "higher
> >>>level" entities to manage traces for or on bahalf of "lower level"
> >>>entities. For example, if an OPES processor uses 100 tiny callout
> >>>services, the processor may be configured to remove all callout
> >>>service entries from the trace and just insert its own entry (to
> >>>keep the trace reasonably small).
> >>
> >>It seems to me, however, that in this case, the OPES processor must
> >>still be able to identify those 100 tiny callout services when a
> >>user inquiry arrives later on. It's not sufficient just to know
> >>"yes, I did something to the message and a several services were
> >>executed". It's necessary to know exactly which services were
> >>executed. How else would someone be able to solve possible problems?
> >
> >
> > The above is indeed desirable but on a MAY level:
> >
> > 	- The OPES processor may have a fixed configuration
> > 	  so it can always answer your question without
> > 	  any extra information in the trace.
> >
> > 	- The OPES processor may insert a [coded] summary
> > 	  of the 100 services applied so that it can
> > 	  answer your question with more (but perhaps
> > 	  incomplete) information about 100 services.
> >
> > 	- The user will most likely not understand and
> > 	  not care what those 100 tiny services are. We
> > 	  cannot demand that every service is documented
> > 	  sufficiently enough that every reasonable
> > 	  human being understands what it does.
> >
> > 	* It is the job of the OPES processor to solve
> > 	  problems. Let's not tell it how. It is the right
> > 	  of the other side to complain about problems.
> > 	  Let's give it sufficient tools to do so. What is
> > 	  sufficient? Whatever the trace builder considers
> > 	  sufficient (because it is the builder that is
> > 	  responsible for decoding the trace details and
> > 	  solving the problem)! A System MUST be traced
> > 	  so that the other side always knows who to
> > 	  complain, regardless of what the trace builder
> > 	  considered "sufficient".
> >
> > The first three arguments are just examples of why anything above MAY
> > level would not make much sense when we are talking about something as
> > poorly scoped as an OPES service.
> >
> > The last argument is the most important one, IMO. It is the
> > cornerstone of what I would consider a good tracing approach in an
> > OPES context. The trace is a trouble ticket ready for submission to a
> > known address. The trace in itself is not necessarily a detailed or
> > clear description of what has happened.
> >
> > We are not dealing with two "equal" sides communicating with one
> > another. Our sides have very different view of the problem domain.
> > Let's make it easy for a side to complain. Let's leave troubleshooting
> > specifics to the troubleshooter since there are so many different ones
> > that we cannot even enumerate them.
> >
> >
> >>This should be spelled out in the document.
> >
> >
> > Yes, of course, but that's Abbie's job :-).
> >
> >
> >>It might be a local matter on how this is achieved - one might
> >>decide to maintain the necessary state (well, I probably wouldn't
> >>opt for that option), or maybe the executed services get somehow
> >>encoded/encrypted in the trace entry itself...
> >
> >
> > Exactly.
> >
> > Alex.
> >
>
>


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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: Alex Rousskov <rousskov@measurement-factory.com>,
        OPES WG
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Subject: RE: [opes-end-comm]: What is traceable in an OPES Flow?
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Hi,

Agreed on all

Abbie


> -----Original Message-----
> From: Alex Rousskov [mailto:rousskov@measurement-factory.com] 
> Sent: Friday, August 29, 2003 12:36 PM
> To: OPES WG
> Subject: Re: [opes-end-comm]: What is traceable in an OPES Flow?
> 
> 
> 
> 
> On Fri, 29 Aug 2003, Markus Hofmann wrote:
> 
> > Alex Rousskov wrote:
> >
> > > The intent behind the above two sentences is to allow 
> "higher level" 
> > > entities to manage traces for or on bahalf of "lower level" 
> > > entities. For example, if an OPES processor uses 100 tiny callout 
> > > services, the processor may be configured to remove all callout 
> > > service entries from the trace and just insert its own entry (to 
> > > keep the trace reasonably small).
> >
> > It seems to me, however, that in this case, the OPES processor must 
> > still be able to identify those 100 tiny callout services 
> when a user 
> > inquiry arrives later on. It's not sufficient just to know 
> "yes, I did 
> > something to the message and a several services were 
> executed". It's 
> > necessary to know exactly which services were executed. How 
> else would 
> > someone be able to solve possible problems?
> 
> The above is indeed desirable but on a MAY level:
> 
> 	- The OPES processor may have a fixed configuration
> 	  so it can always answer your question without
> 	  any extra information in the trace.
> 
> 	- The OPES processor may insert a [coded] summary
> 	  of the 100 services applied so that it can
> 	  answer your question with more (but perhaps
> 	  incomplete) information about 100 services.
> 
> 	- The user will most likely not understand and
> 	  not care what those 100 tiny services are. We
> 	  cannot demand that every service is documented
> 	  sufficiently enough that every reasonable
> 	  human being understands what it does.
> 
> 	* It is the job of the OPES processor to solve
> 	  problems. Let's not tell it how. It is the right
> 	  of the other side to complain about problems.
> 	  Let's give it sufficient tools to do so. What is
> 	  sufficient? Whatever the trace builder considers
> 	  sufficient (because it is the builder that is
> 	  responsible for decoding the trace details and
> 	  solving the problem)! A System MUST be traced
> 	  so that the other side always knows who to
> 	  complain, regardless of what the trace builder
> 	  considered "sufficient".
> 
> The first three arguments are just examples of why anything 
> above MAY level would not make much sense when we are talking 
> about something as poorly scoped as an OPES service.
> 
> The last argument is the most important one, IMO. It is the 
> cornerstone of what I would consider a good tracing approach 
> in an OPES context. The trace is a trouble ticket ready for 
> submission to a known address. The trace in itself is not 
> necessarily a detailed or clear description of what has happened.
> 
> We are not dealing with two "equal" sides communicating with 
> one another. Our sides have very different view of the 
> problem domain. Let's make it easy for a side to complain. 
> Let's leave troubleshooting specifics to the troubleshooter 
> since there are so many different ones that we cannot even 
> enumerate them.
> 
> > This should be spelled out in the document.
> 
> Yes, of course, but that's Abbie's job :-).
> 
> > It might be a local matter on how this is achieved - one 
> might decide 
> > to maintain the necessary state (well, I probably wouldn't opt for 
> > that option), or maybe the executed services get somehow 
> > encoded/encrypted in the trace entry itself...
> 
> Exactly.
> 
> Alex.
> 
> 

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<P><FONT SIZE=3D2>Hi,</FONT>
</P>

<P><FONT SIZE=3D2>Agreed on all</FONT>
</P>

<P><FONT SIZE=3D2>Abbie</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=3D2>&gt; From: Alex Rousskov [<A =
HREF=3D"mailto:rousskov@measurement-factory.com">mailto:rousskov@measure=
ment-factory.com</A>] </FONT>
<BR><FONT SIZE=3D2>&gt; Sent: Friday, August 29, 2003 12:36 PM</FONT>
<BR><FONT SIZE=3D2>&gt; To: OPES WG</FONT>
<BR><FONT SIZE=3D2>&gt; Subject: Re: [opes-end-comm]: What is traceable =
in an OPES Flow?</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; On Fri, 29 Aug 2003, Markus Hofmann =
wrote:</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; Alex Rousskov wrote:</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; The intent behind the above two =
sentences is to allow </FONT>
<BR><FONT SIZE=3D2>&gt; &quot;higher level&quot; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; entities to manage traces for or on =
bahalf of &quot;lower level&quot; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; entities. For example, if an OPES =
processor uses 100 tiny callout </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; services, the processor may be =
configured to remove all callout </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; service entries from the trace and =
just insert its own entry (to </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; &gt; keep the trace reasonably =
small).</FONT>
<BR><FONT SIZE=3D2>&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; It seems to me, however, that in this =
case, the OPES processor must </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; still be able to identify those 100 tiny =
callout services </FONT>
<BR><FONT SIZE=3D2>&gt; when a user </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; inquiry arrives later on. It's not =
sufficient just to know </FONT>
<BR><FONT SIZE=3D2>&gt; &quot;yes, I did </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; something to the message and a several =
services were </FONT>
<BR><FONT SIZE=3D2>&gt; executed&quot;. It's </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; necessary to know exactly which services =
were executed. How </FONT>
<BR><FONT SIZE=3D2>&gt; else would </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; someone be able to solve possible =
problems?</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; The above is indeed desirable but on a MAY =
level:</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; - The OPES =
processor may have a fixed configuration</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; so it can =
always answer your question without</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; any extra =
information in the trace.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; - The OPES =
processor may insert a [coded] summary</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; of the =
100 services applied so that it can</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; answer =
your question with more (but perhaps</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; =
incomplete) information about 100 services.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; - The user will =
most likely not understand and</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; not care =
what those 100 tiny services are. We</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; cannot =
demand that every service is documented</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; =
sufficiently enough that every reasonable</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; human =
being understands what it does.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; * It is the job =
of the OPES processor to solve</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; problems. =
Let's not tell it how. It is the right</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; of the =
other side to complain about problems.</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; Let's =
give it sufficient tools to do so. What is</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; =
sufficient? Whatever the trace builder considers</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; =
sufficient (because it is the builder that is</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; =
responsible for decoding the trace details and</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; solving =
the problem)! A System MUST be traced</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; so that =
the other side always knows who to</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; complain, =
regardless of what the trace builder</FONT>
<BR><FONT SIZE=3D2>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; =
considered &quot;sufficient&quot;.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; The first three arguments are just examples of =
why anything </FONT>
<BR><FONT SIZE=3D2>&gt; above MAY level would not make much sense when =
we are talking </FONT>
<BR><FONT SIZE=3D2>&gt; about something as poorly scoped as an OPES =
service.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; The last argument is the most important one, =
IMO. It is the </FONT>
<BR><FONT SIZE=3D2>&gt; cornerstone of what I would consider a good =
tracing approach </FONT>
<BR><FONT SIZE=3D2>&gt; in an OPES context. The trace is a trouble =
ticket ready for </FONT>
<BR><FONT SIZE=3D2>&gt; submission to a known address. The trace in =
itself is not </FONT>
<BR><FONT SIZE=3D2>&gt; necessarily a detailed or clear description of =
what has happened.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; We are not dealing with two &quot;equal&quot; =
sides communicating with </FONT>
<BR><FONT SIZE=3D2>&gt; one another. Our sides have very different view =
of the </FONT>
<BR><FONT SIZE=3D2>&gt; problem domain. Let's make it easy for a side =
to complain. </FONT>
<BR><FONT SIZE=3D2>&gt; Let's leave troubleshooting specifics to the =
troubleshooter </FONT>
<BR><FONT SIZE=3D2>&gt; since there are so many different ones that we =
cannot even </FONT>
<BR><FONT SIZE=3D2>&gt; enumerate them.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; This should be spelled out in the =
document.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Yes, of course, but that's Abbie's job =
:-).</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; It might be a local matter on how this is =
achieved - one </FONT>
<BR><FONT SIZE=3D2>&gt; might decide </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; to maintain the necessary state (well, I =
probably wouldn't opt for </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; that option), or maybe the executed =
services get somehow </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; encoded/encrypted in the trace entry =
itself...</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Exactly.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Alex.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
</P>

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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: Markus Hofmann <markus@mhof.com>, OPES Group <ietf-openproxy@imc.org>
Subject: RE: Optional Notification?
Date: Fri, 29 Aug 2003 14:53:24 -0400
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All,

I think we can mention that, but I really doubt that we should get involved
in it.

Aptional Notification in my opnion should be out of scope.

Abbie


> -----Original Message-----
> From: Markus Hofmann [mailto:markus@mhof.com] 
> Sent: Friday, August 29, 2003 1:01 PM
> To: OPES Group
> Subject: Re: Optional Notification?
> 
> 
> 
> Alex Rousskov wrote:
> 
> > We can say that the value of this optional flag/field is a URI that 
> > identifies notification method plus parameters. If a processor 
> > understands the method, it would be able to further decode 
> the field 
> > and send a notification. This way, we only have to document 
> the field 
> > name and format for ever application protocol. We do not have to 
> > invent the notification protocol.
> 
> Exactly, that's what I had in mind.
> 
> > For example, we can document the
> > following HTTP header:
> > 
> > 	OPES-Notify: URI *(pname=pvalue)
> > 
> > On the other hand, the utility of the above approach is going to be 
> > rather low. An alternative is for whoever writes the notification 
> > protocol is to document the above approach OR invent its 
> own, specific 
> > to that protocol. For example,
> > 
> > 	My-OPES-Notify: foo=bar q=0.5
> > 
> > (which simply moves URI standardization problem to the header name 
> > standardization problem).
> 
> I don't think we want to start specifying our own notification 
> protocol. Using the URI option for now, but allowing someone to 
> specify - if needed - a notification protocol later on might be the 
> way to go.
> 
> Anyone else any thoughts? Should we include "OPES-Notify:" 
> HTTP header 
> in our OCP/HTTP bindings document?
> 
> -Markus
> 
> 

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<P><FONT SIZE=2>All,</FONT>
</P>

<P><FONT SIZE=2>I think we can mention that, but I really doubt that we should get involved in it.</FONT>
</P>

<P><FONT SIZE=2>Aptional Notification in my opnion should be out of scope.</FONT>
</P>

<P><FONT SIZE=2>Abbie</FONT>
</P>
<BR>

<P><FONT SIZE=2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=2>&gt; From: Markus Hofmann [<A HREF="mailto:markus@mhof.com">mailto:markus@mhof.com</A>] </FONT>
<BR><FONT SIZE=2>&gt; Sent: Friday, August 29, 2003 1:01 PM</FONT>
<BR><FONT SIZE=2>&gt; To: OPES Group</FONT>
<BR><FONT SIZE=2>&gt; Subject: Re: Optional Notification?</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Alex Rousskov wrote:</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; We can say that the value of this optional flag/field is a URI that </FONT>
<BR><FONT SIZE=2>&gt; &gt; identifies notification method plus parameters. If a processor </FONT>
<BR><FONT SIZE=2>&gt; &gt; understands the method, it would be able to further decode </FONT>
<BR><FONT SIZE=2>&gt; the field </FONT>
<BR><FONT SIZE=2>&gt; &gt; and send a notification. This way, we only have to document </FONT>
<BR><FONT SIZE=2>&gt; the field </FONT>
<BR><FONT SIZE=2>&gt; &gt; name and format for ever application protocol. We do not have to </FONT>
<BR><FONT SIZE=2>&gt; &gt; invent the notification protocol.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Exactly, that's what I had in mind.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; For example, we can document the</FONT>
<BR><FONT SIZE=2>&gt; &gt; following HTTP header:</FONT>
<BR><FONT SIZE=2>&gt; &gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; &nbsp;&nbsp;&nbsp; OPES-Notify: URI *(pname=pvalue)</FONT>
<BR><FONT SIZE=2>&gt; &gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; On the other hand, the utility of the above approach is going to be </FONT>
<BR><FONT SIZE=2>&gt; &gt; rather low. An alternative is for whoever writes the notification </FONT>
<BR><FONT SIZE=2>&gt; &gt; protocol is to document the above approach OR invent its </FONT>
<BR><FONT SIZE=2>&gt; own, specific </FONT>
<BR><FONT SIZE=2>&gt; &gt; to that protocol. For example,</FONT>
<BR><FONT SIZE=2>&gt; &gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; &nbsp;&nbsp;&nbsp; My-OPES-Notify: foo=bar q=0.5</FONT>
<BR><FONT SIZE=2>&gt; &gt; </FONT>
<BR><FONT SIZE=2>&gt; &gt; (which simply moves URI standardization problem to the header name </FONT>
<BR><FONT SIZE=2>&gt; &gt; standardization problem).</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; I don't think we want to start specifying our own notification </FONT>
<BR><FONT SIZE=2>&gt; protocol. Using the URI option for now, but allowing someone to </FONT>
<BR><FONT SIZE=2>&gt; specify - if needed - a notification protocol later on might be the </FONT>
<BR><FONT SIZE=2>&gt; way to go.</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; Anyone else any thoughts? Should we include &quot;OPES-Notify:&quot; </FONT>
<BR><FONT SIZE=2>&gt; HTTP header </FONT>
<BR><FONT SIZE=2>&gt; in our OCP/HTTP bindings document?</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; -Markus</FONT>
<BR><FONT SIZE=2>&gt; </FONT>
<BR><FONT SIZE=2>&gt; </FONT>
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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: Alex Rousskov <rousskov@measurement-factory.com>,
        Markus Hofmann
	 <markus@mhof.com>
Cc: OPES WG <ietf-openproxy@imc.org>
Subject: RE: [opes-end-comm]: What is traceable in an OPES Flow?
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> -----Original Message-----
> From: Alex Rousskov [mailto:rousskov@measurement-factory.com] 
> Sent: Friday, August 29, 2003 1:26 PM
> To: Markus Hofmann
> Cc: OPES WG
> Subject: Re: [opes-end-comm]: What is traceable in an OPES Flow?
> 
> 
> 
> 
> On Fri, 29 Aug 2003, Markus Hofmann wrote:
> 
> > I'd suggest that the document includes and explains these 
> thoughts and 
> > reasons - just along the lines of your comments below. It 
> will help to 
> > decide whether we've consesus or not.
> 
> Yes, as a separate non-normative "Rationale" section or 
> subsection. While I do want to document our rationale, I am 
> afraid that if it is intermingled with normative text than 
> people will find a mistake or a loophole in our reasoning and 
> will use that as a reason to violate a related MUST. This 
> common problem is especially dangerous when we talk about 
> controversial and poorly defined concepts as OPES.
> 
> Alex.
> 
--------Abbie

Agreed

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<P><FONT SIZE=3D2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=3D2>&gt; From: Alex Rousskov [<A =
HREF=3D"mailto:rousskov@measurement-factory.com">mailto:rousskov@measure=
ment-factory.com</A>] </FONT>
<BR><FONT SIZE=3D2>&gt; Sent: Friday, August 29, 2003 1:26 PM</FONT>
<BR><FONT SIZE=3D2>&gt; To: Markus Hofmann</FONT>
<BR><FONT SIZE=3D2>&gt; Cc: OPES WG</FONT>
<BR><FONT SIZE=3D2>&gt; Subject: Re: [opes-end-comm]: What is traceable =
in an OPES Flow?</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; On Fri, 29 Aug 2003, Markus Hofmann =
wrote:</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; I'd suggest that the document includes and =
explains these </FONT>
<BR><FONT SIZE=3D2>&gt; thoughts and </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; reasons - just along the lines of your =
comments below. It </FONT>
<BR><FONT SIZE=3D2>&gt; will help to </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; decide whether we've consesus or =
not.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Yes, as a separate non-normative =
&quot;Rationale&quot; section or </FONT>
<BR><FONT SIZE=3D2>&gt; subsection. While I do want to document our =
rationale, I am </FONT>
<BR><FONT SIZE=3D2>&gt; afraid that if it is intermingled with =
normative text than </FONT>
<BR><FONT SIZE=3D2>&gt; people will find a mistake or a loophole in our =
reasoning and </FONT>
<BR><FONT SIZE=3D2>&gt; will use that as a reason to violate a related =
MUST. This </FONT>
<BR><FONT SIZE=3D2>&gt; common problem is especially dangerous when we =
talk about </FONT>
<BR><FONT SIZE=3D2>&gt; controversial and poorly defined concepts as =
OPES.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Alex.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>--------Abbie</FONT>
</P>

<P><FONT SIZE=3D2>Agreed</FONT>
</P>

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Abbie Barbir wrote:

> I think we can mention that, but I really doubt that we should get involved
> in it.
> 
> Aptional Notification in my opnion should be out of scope.

I agree in that we do *not* want to take on the specification of a 
separate notification protocol, but getting the necessary hooks into 
HTTP/OCP binding is very well in scope (e.g. using an additional HTTP 
header as discussed).

-Markus



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From: "Abbie Barbir" <abbieb@nortelnetworks.com>
To: Markus Hofmann <markus@mhof.com>
Cc: OPES Group <ietf-openproxy@imc.org>
Subject: RE: Optional Notification?
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Hi,
yes, no problem.
But we should be very clear on the boundary.
I really do not want to start an something that is optional that ends being
fully in scope and a ticket for a new disaster.

abbie

> -----Original Message-----
> From: Markus Hofmann [mailto:markus@mhof.com] 
> Sent: Friday, August 29, 2003 3:19 PM
> To: Barbir, Abbie [CAR:1A11:EXCH]
> Cc: OPES Group
> Subject: Re: Optional Notification?
> 
> 
> Abbie Barbir wrote:
> 
> > I think we can mention that, but I really doubt that we should get 
> > involved in it.
> > 
> > Aptional Notification in my opnion should be out of scope.
> 
> I agree in that we do *not* want to take on the specification of a 
> separate notification protocol, but getting the necessary hooks into 
> HTTP/OCP binding is very well in scope (e.g. using an additional HTTP 
> header as discussed).
> 
> -Markus
> 
> 

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<P><FONT SIZE=3D2>Hi,</FONT>
<BR><FONT SIZE=3D2>yes, no problem.</FONT>
<BR><FONT SIZE=3D2>But we should be very clear on the boundary.</FONT>
<BR><FONT SIZE=3D2>I really do not want to start an something that is =
optional that ends being fully in scope and a ticket for a new =
disaster.</FONT></P>

<P><FONT SIZE=3D2>abbie</FONT>
</P>

<P><FONT SIZE=3D2>&gt; -----Original Message-----</FONT>
<BR><FONT SIZE=3D2>&gt; From: Markus Hofmann [<A =
HREF=3D"mailto:markus@mhof.com">mailto:markus@mhof.com</A>] </FONT>
<BR><FONT SIZE=3D2>&gt; Sent: Friday, August 29, 2003 3:19 PM</FONT>
<BR><FONT SIZE=3D2>&gt; To: Barbir, Abbie [CAR:1A11:EXCH]</FONT>
<BR><FONT SIZE=3D2>&gt; Cc: OPES Group</FONT>
<BR><FONT SIZE=3D2>&gt; Subject: Re: Optional Notification?</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; Abbie Barbir wrote:</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; I think we can mention that, but I really =
doubt that we should get </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; involved in it.</FONT>
<BR><FONT SIZE=3D2>&gt; &gt; </FONT>
<BR><FONT SIZE=3D2>&gt; &gt; Aptional Notification in my opnion should =
be out of scope.</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; I agree in that we do *not* want to take on the =
specification of a </FONT>
<BR><FONT SIZE=3D2>&gt; separate notification protocol, but getting the =
necessary hooks into </FONT>
<BR><FONT SIZE=3D2>&gt; HTTP/OCP binding is very well in scope (e.g. =
using an additional HTTP </FONT>
<BR><FONT SIZE=3D2>&gt; header as discussed).</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; -Markus</FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
<BR><FONT SIZE=3D2>&gt; </FONT>
</P>

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