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From: SoftCOM <softcom@fesb.hr>
To: softcom@fesb.hr
Subject: IEEE SoftCOM 2001 - new deadline 14.07.2001.
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SoftCOM 2001
9th IEEE Conference on Software,
Telecommunications and Computer Networks

Split, Dubrovnik (Croatia), Ancona, Bari (Italy)
October 09-12, 2001 (aboard the ship "Marko Polo")


Dear member of the SoftCOM mailing list,

Please note that the deadline for submission of papers
has been extended. The final deadline is July 14, 2001.

Call for papers and Author kit can be found at
     
           www.fesb.hr/SoftCOM


Sincerely yours

Conference secretary
Hrvoje Dujmic





From owner-tcp-impl@grc.nasa.gov  Thu Jul  5 14:09:53 2001
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Date: Thu, 5 Jul 2001 10:59:36 -0400 (EDT)
From: Matt Mathis <mathis@psc.edu>
To: Charles Esson <charlese@cvs.com.au>
cc: Martin McSweeney <mmcsween@hopper.math.uwaterloo.ca>,
        tcp-impl@grc.nasa.gov
Subject: Re: Persist Mode -- ** Standards bug ?? 
In-Reply-To: <3B2EF257.68807807@cvs.com.au>
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I think we have conflicting standards.... although I agree with your
recollection, I believe that strict "never retract the window" can not be
implemented.  Consider the following scenario:

A connection negotiates TCP window scale (e.g. 3, so the window size is
	quantized in steps of 8 bytes).
After running for awhile with a reasonable window, the receiver stops
	consuming data.
The sender continues to send data, 1 byte at a time, progressively filling
	the window.
Under these conditions the right edge of the window can not be maintained at a
constant position in the sequence space.  Following 7 consecutive data packets
it will advance by one byte.  On the 8th, it will retract by 7 bytes.
(Alternatively, if the TCP rounds windows to MSS, the steps are MSS sized).

Furthermore when the window finally closes all the way, it will always be due
to a window retraction.

If the TCP doesn't behave this way it will violate some other part of RFC1323
or the base specifications.  Therefore every TCP that implements 1323 violates
rule 1 under some conditions.

Furthermore any TCP requires strict adherence to rule 1 is broken.

I believe that this is "well tested" in todays Internet (it happens all the
time) but nobody has been looking for symptoms.

Now a question for the readers:  what might happen if this rule was formally
retracted or amended?

Thanks,
--MM--

On Tue, 19 Jun 2001, Charles Esson wrote:

> 
> 1) Somewhere in the mile high stack of paper that represents the TCP standard
> it says that the receiver is not allowed to reduce it's advertised window.
> 
> 2) Somewhere else it says the sender is not allowed to expect nice things if
> it transmits past the advertised window.
> 
> If both conditions are met the receiver can't close his window before
> in-flight packets are acked.
> 
> If I am right ( and this is from memory), then all three behave correctly as
> the condition should not arise.
> 
> It would seem AIX4.3 and Sun0S 5.6 throw their hands in the air and wait for
> some sanity. Linux insists you obey rule 1.
> 
> As I only allow the window to move forward I am with linux.




From owner-tcp-impl@grc.nasa.gov  Thu Jul  5 19:18:47 2001
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From: Charles Esson <charlese@cvs.com.au>
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Subject: Re: Persist Mode -- ** Standards bug ??
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I've not implemented a TCP stack that uses the scale option ( performance over
satellite links is not my problem), so I had not thought about this.

I have now, and I can see your point.

For the last 7 bytes the receiver is advertising a right window position past it's
actual right position.

It would not be a problem if the window was calculated. n*scale - ( scale-1). I
would argue that if that isn't the formula for the window  then 1323 has a serious
bug as it breaks some fundamentals.

Regards Charles

Matt Mathis wrote:

> I think we have conflicting standards.... although I agree with your
> recollection, I believe that strict "never retract the window" can not be
> implemented.  Consider the following scenario:
>
> A connection negotiates TCP window scale (e.g. 3, so the window size is
>         quantized in steps of 8 bytes).
> After running for awhile with a reasonable window, the receiver stops
>         consuming data.
> The sender continues to send data, 1 byte at a time, progressively filling
>         the window.
> Under these conditions the right edge of the window can not be maintained at a
> constant position in the sequence space.  Following 7 consecutive data packets
> it will advance by one byte.  On the 8th, it will retract by 7 bytes.
> (Alternatively, if the TCP rounds windows to MSS, the steps are MSS sized).
>
> Furthermore when the window finally closes all the way, it will always be due
> to a window retraction.
>
> If the TCP doesn't behave this way it will violate some other part of RFC1323
> or the base specifications.  Therefore every TCP that implements 1323 violates
> rule 1 under some conditions.
>
> Furthermore any TCP requires strict adherence to rule 1 is broken.
>
> I believe that this is "well tested" in todays Internet (it happens all the
> time) but nobody has been looking for symptoms.
>
> Now a question for the readers:  what might happen if this rule was formally
> retracted or amended?
>
> Thanks,
> --MM--
>



From owner-tcp-impl@grc.nasa.gov  Fri Jul  6 08:09:18 2001
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Subject: NETWORK AND INFO SYSTEMS SECURITY TRAINING CONFERENCE - WASH DC, 16 JULY 2001
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To:	   TCP-IMPL@LERC.NASA.GOV

NEW SPEAKERS ADDED

PLEASE FORWARD THIS TO YOUR MANAGER OF SYSTEMS SECURITY AND SECURITY TECHNOLOGIES GROUP.

Market*Access International is proud to present .... 

NETWORK AND INFORMATION SYSTEMS SECURITY - TRAINING CONFERENCE

AGENCY INTRUSION DETECTION REQUIREMENTS and TECHNOLOGY SOLUTIONS

Date: July 16, 2001

Ronald Reagan Building and International Trade Center
1300 Pennsylvania Avenue
Washington D.C.
Atrium Ballroom

Time: 7:30 AM Registration and Continental Breakfast
Program Starts: 8:30 AM
Wrap-up: 4:15 PM

About this Conference:

As government becomes more dependent on e-business, databases, information storehouses, mission critical information storage and information sharing, new risks are posed. These risks may come from student hackers, foreign governments or foreign military, terrorist organizations or even internal users.

With the new e-Government applications and communications, computer security has emerged as a top issue and challenge. This conference will highlight the risks, opportunities and innovative management and technical approaches to the detection and response to unauthorized intrusions into agency data. The conference will focus on business and military applications and agency plans and programs for securing these applications.

A highlight of this conference will be a section on AGENCY REQUIREMENTS AND NEW TECHNOLOGIES and strategies of coping with unauthorized attempts to compromise agency and DoD systems and data.

SPEAKERS WILL REPRESENT THE FOLLOWING AGENCIES/COMPANIES:

Navy NMCI – Mark Lavoie – Communications Officer, CDR, USNR PEO IT (Program Executive Office of Information Technology).

Department of Transportation - Bonnie Fisher – Director, TASC Millennium Solutions Center

National Science Foundation - Dara Murry – Director, ADP Security

FBI - James Burrell – Acting Unit Chief, Computer Investigation Unit

DARPA - Jim Webster – Manager, Information Assurance Office

GSA/FedCIRC - Larry Hale –  Liaison Director, Federal Computer Incident Response Center 

DOJ – TBD

DISA – TBD

Gartner – Keynote –  TBD

Guardant – Robert Lee – Director, Senior Principal Consultant

Global Integrity - Errol Weiss, Bill Morgan

Verizon, Federal Network Systems - Char Sample – 

Raytheon – Barton Abbott – Director, Information Assurance, Navy /USMC Intranet, Information Strike Force

Symantec - TBD


For more information on speakers and the conference agenda, please visit our web site at www.marketaccess.org.

Who should attend:

* Agency IT Executives, Managers, and Staff 
* Agency Security Executives, Managers and Staff 
* Agency information systems program managers 
* Agency Telecommunications Executives, Managers and Staff 
* Tele-work and Telecomm Directors, Managers, and Staff 
* Functional area managers 
* Systems integrators that support federal agency security requirements 
* Hardware and software solutions providers 

What you will learn:

* Agency plans, programs and priorities 
* Successes and Lessons learned 
* Innovative government intrusion detection security approaches and applications 
* New technologies and strategies - what is on the drawing boards 
* How the military approaches network security and intrusion detection 
* Security of remote database management 
* How to structure intrusion detection solutions 
* Risks, sources of attacks... the internal risk 
* Commercial and government best practices 

Corporate Sponsors:

* Symantec 
* Verizon 
* Market*Access

.... others to be announced

Organizational Sponsors:

* Department of Transportation
* INPUT Government 

....other sponsors to be announced.

Please register early. The conference area has limited seating available and we anticipate a sell out.

Points of Contact:

* For technical support with this web site, please contact Mr. Parrish Knight, 703/807-2748 
* For general information about this event, please contact Ms. Kristen Brooks, 703/807-2745 
* For information on sponsorship opportunities & exhibitor arrangements, please contact Ms. Cara Lombardi at 703/807-2743 

The registration fee for this important training conference is:

*  Government Credit Card or Check in Advance: $395
*  Government Training Forms/Invoice: $445
*  Industry and Federal Contractors, Payment in Advance: $595
*  Industry and Federal Contractors/Invoice: $645

We accept government training forms and government and commercial credit cards (VISA, MC, American Express).

Options:

[1] Phone: 703-807-2745 and speak with Ms. Kristen Brooks.
[2] Email: kbrooks@marketaccess.org
[3] Register online: Use our online booking form to register and pay by credit card electronically.  To register, go to www.marketaccess.org.
[4] Fax: registration form to 301-652-0914.
[5] Mail: registration form to:

Market*Access International, Inc.
4301 Wilson Blvd. #1003
Arlington, VA 22203

Sponsorships Available! For sponsorship information, please contact:

Cara Lombardi
Market*Access International
4301 Wilson Blvd. #1003
Arlington, VA 22203
Phone (703) 807-2743
Fax (703) 807-2728
clombardi@marketaccess.org

If you wish to be REMOVED from this list, please REPLY and place REMOVE in the SUBJECT line.

Thank you





From owner-tcp-impl@grc.nasa.gov  Fri Jul  6 16:09:45 2001
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Date: Fri, 6 Jul 2001 15:54:23 -0400 (EDT)
From: Matt Mathis <mathis@psc.edu>
To: Charles Esson <charlese@cvs.com.au>
cc: tcp-impl@grc.nasa.gov
Subject: Re: Persist Mode -- ** Standards bug ??
In-Reply-To: <3B44F282.20F9F14F@cvs.com.au>
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On Fri, 6 Jul 2001, Charles Esson wrote:

> I've not implemented a TCP stack that uses the scale option ( performance over
> satellite links is not my problem), so I had not thought about this.
> 
> I have now, and I can see your point.
> 
> For the last 7 bytes the receiver is advertising a right window position past
> it's actual right position.
> 
> It would not be a problem if the window was calculated. n*scale - ( scale-1). I
> would argue that if that isn't the formula for the window  then 1323 has a
> serious bug as it breaks some fundamentals.

I beleive all implementation are careful to do the rounding such that they
never announce space beyond the end of the buffer.  Im my example the last
non-zero receiver window announcement would be when there are exactly 8 bytes
of space left (and the window field would have the value 1).  Following the
next byte sent the announced window *must* drop to 0 even though there are
still 7 bytes of space left.  Otherwise the receiver will announce space beyond
the end of the buffer.

Thanks,
--MM--




From owner-tcp-impl@grc.nasa.gov  Thu Jul 12 19:28:56 2001
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Date: Thu, 12 Jul 2001 19:11:29 -0400
To: tcp-impl@grc.nasa.gov
Subject: OS/TCP behavior on client crashes (for send sockets)
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What is the expected behaviour of TCP when there is an app that has a socket in an established state, but the app crashes abruptly without sending a FIN out?. Would the OS ensure that a RST gets sent out when the cleanup for the app takes place. Or there is no action taken when the OS reclaims the process' socket descriptors?

Thanks

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From owner-tcp-impl@grc.nasa.gov  Fri Jul 13 14:23:44 2001
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Message-Id: <200107131810.WAA02606@ms2.inr.ac.ru>
Subject: Re: Persist Mode -- ** Standards bug ??
To: mathis@psc.edu (Matt Mathis)
Date: Fri, 13 Jul 2001 22:10:38 +0400 (MSK DST)
Cc: charlese@cvs.com.au, mmcsween@hopper.math.uwaterloo.ca,
        tcp-impl@grc.nasa.gov
In-Reply-To: <Pine.NEB.4.05.10107051013230.15832-100000@tesla.psc.edu> from "Matt Mathis" at Jul 5, 1 10:59:36 am
X-Mailer: ELM [version 2.4 PL24]
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Hello!


> it will advance by one byte.  On the 8th, it will retract by 7 bytes.

Yes.

Plus, window shrinking happens frequently with window update algorithm
used at receiver side f.e. by freebsd. Look into the archives of this maillist,
subj "Send window update algorithm".


> I believe that this is "well tested" in todays Internet (it happens all the
> time) but nobody has been looking for symptoms.

All these spurious kinds of window shrinking do not result in _any_
problems if tcp follows minimal RFC requirements.


Real differences in behaviour of different implementations (and some problems)
start when not only effectively delivered to sender advertised window
is shrinken occasionally, but when two conditions happen simulteneously:
- receiver shrinks window used internally for segment accepting
  (i.e. _deliberately_ and explicitly)
- right edge is kept retracted for interval longer than retransmission timeout

However, this does not affect sender satisfying minimal requirements
formulated in RFCs.


Note also, that effect on congestion avoidance (noticed recently in this maillist)
is present only in implementations not falling to restart cwnd after rto.
For those wich normally do not reprobe pipe (like linux-2.2), this effect
is only useful. If AIX and Co do not implement any cwnd validation, it
is rather their feature. :-)

Alexey


From owner-tcp-impl@grc.nasa.gov  Wed Jul 18 11:44:24 2001
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From: Bill Fenner <fenner@research.att.com>
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To: tcp-impl@grc.nasa.gov
Subject: TCP-MIB update
Date: Wed, 18 Jul 2001 08:29:31 -0700
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FYI, the IPv6 MIB design team, chartered under the IPNG WG, is revising
the IP/UDP/TCP MIBs.  I'd like to solicit input from implementors on:

- The idea of creating a seperate listening table, instead of using the
  convention of an all-zeroes remote address
- Additional counters that would be useful

Thanks,

  Bill


----- Begin forwarded message:

From: Internet-Drafts@ietf.org
Subject: I-D ACTION:draft-ietf-ipngwg-rfc2012-update-00.txt
Date: Wed, 18 Jul 2001 06:57:34 -0400
To: IETF-Announce: ;
Cc: ipng@sunroof.eng.sun.com
Reply-to: Internet-Drafts@ietf.org

	Title		: Management Information Base for the Transmission 
                          Control Protocol (TCP)
	Author(s)	: B. Fenner et al.
	Filename	: draft-ietf-ipngwg-rfc2012-update-00.txt
	Pages		: 21
	Date		: 17-Jul-01
	
This memo defines a portion of the Management Information Base (MIB) for
use with network management protocols in the Internet community.  In
particular, it describes managed objects used for implementations of the
Transmission Control Protocol (TCP) [5] in an IP version independent
manner.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-ipngwg-rfc2012-update-00.txt

Internet-Drafts are also available by anonymous FTP. Login with the username
"anonymous" and a password of your e-mail address. After logging in,
type "cd internet-drafts" and then
	"get draft-ietf-ipngwg-rfc2012-update-00.txt".

A list of Internet-Drafts directories can be found in
http://www.ietf.org/shadow.html 
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt


----- End forwarded message:


From owner-tcp-impl@grc.nasa.gov  Wed Jul 18 16:24:06 2001
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From: Simon Leinen <simon@limmat.switch.ch>
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>>>>> "bf" == Bill Fenner <fenner@research.att.com> writes:
> FYI, the IPv6 MIB design team, chartered under the IPNG WG, is revising
> the IP/UDP/TCP MIBs.  I'd like to solicit input from implementors on:

(What kind of implementor do I have to be in order to make my
contribution eligible for consideration? I only implement networks,
and sometimes management tools, but no TCP stacks.  Hope you don't
mind my intrusion :-)

> - The idea of creating a seperate listening table, instead of using
>   the convention of an all-zeroes remote address

I like it.  Most management applications that I can think of handle
listening and non-listening sockets, ehm, TCP endpoints, separately,
so having them in separate tables would (1) simplify those
applications (2) make them more efficient because they don't have to
skip inappropriate rows and (3) remove the all-zeroes remote address
convention.  Whether that is sufficient justification for the new
approach I don't know.

> - Additional counters that would be useful

Per-connection input/output octet counters would have been extremely
useful to me sometimes, when trying to look at data rates within
distributed applications that use TCP.

Of course there are many other per-connection things that you could
count (such as segments, retransmissions, duplicate acks, misordered
segments...) or track (such as window sizes, MSS, whether the
connection uses SACK, ECN, timestamps, window scaling etc.).  It would
be nice to have all of these accessible via SNMP, but the octet
counters are the one thing I have actually missed a couple of times.
-- 
Simon Leinen				       simon@babar.switch.ch
SWITCH				   http://www.switch.ch/misc/leinen/

	       Computers hate being anthropomorphized.


From owner-tcp-impl@grc.nasa.gov  Fri Jul 20 00:02:41 2001
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From owner-tcp-impl@grc.nasa.gov  Thu Jul 26 13:39:38 2001
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Date: Thu, 26 Jul 2001 14:51:56 +0200
From: Jan-Oliver Rock <jor@comnets.rwth-aachen.de>
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Hi!

I have a question on RTT calculations. Stevens Part 1 states on page
305:
"When the ACK for the first data segment arrives ... our estimators are
initialized as

A=M+0.5 ...
D=A/2 ...
"

My question is where these equations are defined. I haven't found any
RFC
where this is mentioned.

Thanx, Oliver


From owner-tcp-impl@grc.nasa.gov  Thu Jul 26 19:01:06 2001
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To: Jan-Oliver Rock <jor@comnets.rwth-aachen.de>
From: Mark Allman <mallman@grc.nasa.gov>
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Subject: Re: RTT calculations 
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> I have a question on RTT calculations. 
>
> [...]
> 
> My question is where these equations are defined. I haven't found
> any RFC where this is mentioned.

Vern Paxson, Mark Allman. Computing TCP's Retransmission Timer,
November 2000. RFC 2988.

allman


