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From: "Simonnot, Olivier (ELS)" <O.Simonnot@elsevier.com>
Subject: Table of Contents Computer Networks Volume 38, Nos. 5 & 6
Date: Wed, 3 Apr 2002 15:13:57 +0100 
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> _________________________________
> APOLOGIES FOR DUPLICATE MESSAGES
> _________________________________
> 
> Please find below the Table of Contents to the two latest
> editions of Computer Networks.
> _________________________________
> 
> 
> Volume 38, Nos.~6, published April 22, 2002	
> 
> For journal subscribers full text appears as pdf on
> www.elsevier.com/locate/compnw
> 
> Hierarchical network management: a scalable and dynamic mobile agent-based
> 
> approach
> 	Damianos Gavalas, Dominic Greenwood,
> 	Mohammed Ghanbari and Mike O'Mahony, p. 693.
> 	http://www.elsevier.com/PII/S1389128601002778
> 
> Temporally enhanced erasure codes for reliable communication protocols
> 	Seonho Choi, p. 713.
> 	http://www.elsevier.com/PII/S1389128601002808
> 
> TCP-friendly traffic conditioning in DiffServ networks: a memory-based 
> approach
> 	K.R. Renjish Kumar, A.L. Ananda and Lillykutty Jacob, p. 731.
> 	http://www.elsevier.com/PII/S138912860100281X
> 
> Adapting to route-demand and mobility in ad hoc network routing
> 	Sungjoon Ahn and A. Udaya Shankar, p. 745.
> 	http://www.elsevier.com/PII/S1389128601002833
> 
> Optimal admission control algorithms for scheduling burst data in CDMA 
> multimedia systems
> 	Yu-Kwong Kwok and Vincent K.N. Lau, p. 765.
> 	http://www.elsevier.com/PII/S1389128601002845
> 
> ProWGen: a synthetic workload generation tool for simulation evaluation of
> 
> web proxy caches
> 	Mudashiru Busari and Carey Williamson, p. 779.
> 	http://www.elsevier.com/PII/S1389128601002857
> 
> Refreshment policies for Web content caches
> 	Edith Cohen and Haim Kaplan, p. 795.
> 	http://www.elsevier.com/PII/S1389128601003000
> 
> Internet access traffic sharing in a multi-operator environment
> 	M. Naldi, p. 809.
> 	http://www.elsevier.com/PII/S1389128601003073
> 
> Author Index Volume 38
> 	p. 825.
> 	http://www.elsevier.com/PII/S1389128602001937
> 
> Subject Index Volume 38
> 	p. 829.
> 	http://www.elsevier.com/PII/S1389128602001949
> 
> 
> 
> 
> Volume 38, Nos.~5, published April 05, 2002	
> 
> For journal subscribers full text appears as pdf on
> www.elsevier.com/locate/compnw
> 
> MTCP: scalable TCP-like congestion control for reliable multicast
> 	Injong Rhee, Nallathambi Balaguru and
> 	George N. Rouskas, p. 553.
> 	http://www.elsevier.com/PII/S1389128601002687
> 
> Mobility-based predictive call admission control and bandwidth 
> reservation in wireless cellular networks
> 	Fei Yu and Victor Leung, p. 577.
> 	http://www.elsevier.com/PII/S1389128601002699
> 
> A pragmatic approach to service interaction filtering between call control
> 
> services
> 	Mario Kolberg and Evan H. Magill, p. 591.
> 	http://www.elsevier.com/PII/S1389128601002705
> 
> Modeling variable user mobility with stochastic correlation concept
> 	Ki-Dong Lee and Sehun Kim, p. 603.
> 	http://www.elsevier.com/PII/S1389128601002742
> 
> Optimal resource allocation in multi-class networks with user-specified 
> utility functions
> 	Suresh Kalyanasundaram, Edwin K.P. Chong and
> 	Ness B. Shroff, p. 613.
> 	http://www.elsevier.com/PII/S1389128601002754
> 
> Optimization for adaptive bandwidth reservation in wireless multimedia 
> networks
> 	Ki-Dong Lee and Sehun Kim, p. 631.
> 	http://www.elsevier.com/PII/S1389128601002766
> 
> An efficient traffic control scheme for TCP over ATM GFR services
> 	Chia-Tai Chan, Pi-Chung Wang and Yaw-Chung Chen, p. 645.
> 	http://www.elsevier.com/PII/S138912860100278X
> 
> Comparison of two path restoration schemes in self-healing networks
> 	Yijun Xiong and Lorne Mason, p. 663.
> 	http://www.elsevier.com/PII/S1389128601002791
> 
> Applying lightweight directory access protocol service on session 
> certification authority
> 	Yi-Shiung Yeh, Wei-Shen Lai and Chung-Jaye Cheng, p. 675.
> 	http://www.elsevier.com/PII/S1389128601002821
> 


From owner-tcp-impl@grc.nasa.gov  Thu Apr  4 07:19:42 2002
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From: Jessie <sexy69@usa.net>
To: tcp-impl@grc.nasa.gov
Subject: Is this what you wanted....
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<body bgcolor="#003399">

<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FFFFFF" size="6">THE BEST WEB CAMS 
ON THE NET</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FF0000" size="6">EXCLUSIVE LIVE 
PERSONAL WEB-CAMS!!!</font></b></p>
<p align="center"><b><font face="Haettenschweiler" size="6" color="#FFFFFF">Do 
you want to watch me play with myself all night long </font>
<font size="6" color="#FFFFFF" face="Arial">;)</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" size="7" color="#FFFF00">
<a href="http://7814731399"><font color="#FFFF00">CLICK HERE FOR ACCESS</font></a></font></b></p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center"><font color="#FFFFFF">This following pages contain adult 
material. Do not enter if you are not at least 18 years of age!!!</font></p>
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From owner-tcp-impl@grc.nasa.gov  Thu Apr  4 07:19:43 2002
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From: Jessie <sexy69@usa.net>
To: tcp-impl@grc.nasa.gov
Subject: Is this what you wanted....
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</head>

<body bgcolor="#003399">

<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FFFFFF" size="6">THE BEST WEB CAMS 
ON THE NET</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FF0000" size="6">EXCLUSIVE LIVE 
PERSONAL WEB-CAMS!!!</font></b></p>
<p align="center"><b><font face="Haettenschweiler" size="6" color="#FFFFFF">Do 
you want to watch me play with myself all night long </font>
<font size="6" color="#FFFFFF" face="Arial">;)</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" size="7" color="#FFFF00">
<a href="http://7814731399"><font color="#FFFF00">CLICK HERE FOR ACCESS</font></a></font></b></p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center"><font color="#FFFFFF">This following pages contain adult 
material. Do not enter if you are not at least 18 years of age!!!</font></p>
<p align="center"><font color="#FFFFFF">To be removed from our mailing list 
click <b>
<a href="mailto:unsub-8168036-91@william.monsterjoke.com?subject=Unsubscribe">
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From owner-tcp-impl@grc.nasa.gov  Thu Apr  4 08:04:56 2002
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From: Jessie <sexy69@usa.net>
To: tcp-impl@grc.nasa.gov
Subject: Is this what you wanted....
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<html>

<head>
<meta http-equiv="Content-Language" content="en-us">
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>THE BEST WEB CAMS ON THE NET</title>
</head>

<body bgcolor="#003399">

<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FFFFFF" size="6">THE BEST WEB CAMS 
ON THE NET</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FF0000" size="6">EXCLUSIVE LIVE 
PERSONAL WEB-CAMS!!!</font></b></p>
<p align="center"><b><font face="Haettenschweiler" size="6" color="#FFFFFF">Do 
you want to watch me play with myself all night long </font>
<font size="6" color="#FFFFFF" face="Arial">;)</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" size="7" color="#FFFF00">
<a href="http://7814731399"><font color="#FFFF00">CLICK HERE FOR ACCESS</font></a></font></b></p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center"><font color="#FFFFFF">This following pages contain adult 
material. Do not enter if you are not at least 18 years of age!!!</font></p>
<p align="center"><font color="#FFFFFF">To be removed from our mailing list 
click <b>
<a href="mailto:unsub-8168036-91@william.monsterjoke.com?subject=Unsubscribe">
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From owner-tcp-impl@grc.nasa.gov  Thu Apr  4 16:57:19 2002
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Thanks for abusing my address....

----- Forwarded message from Jessie <sexy69@usa.net> -----
Date: Thu, 4 Apr 2002 07:11:43 -0500
From: Jessie <sexy69@usa.net>
Reply-To: Jessie <sexy69@usa.net>
Subject: Is this what you wanted....
To: tcp-impl@grc.nasa.gov

<html>

<head>
<meta http-equiv="Content-Language" content="en-us">
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type" content="text/html; 
charset=windows-1252">
<title>THE BEST WEB CAMS ON THE NET</title>
</head>

<body bgcolor="#003399">

<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FFFFFF" size="6">THE 
BEST WEB CAMS 
ON THE NET</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FF0000" 
size="6">EXCLUSIVE LIVE 
PERSONAL WEB-CAMS!!!</font></b></p>
<p align="center"><b><font face="Haettenschweiler" size="6" 
color="#FFFFFF">Do 
you want to watch me play with myself all night long </font>
<font size="6" color="#FFFFFF" face="Arial">;)</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" size="7" color="#FFFF00">
<a href="http://7814731399"><font color="#FFFF00">CLICK HERE FOR
ACCESS</font></a></font></b></p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center"><font color="#FFFFFF">This following pages 
contain adult 
material. Do not enter if you are not at least 18 years of age!!!
</font></p>
<p align="center"><font color="#FFFFFF">To be removed from our 
mailing list 
click <b>
<a href="mailto:unsub-8168036-91@william.monsterjoke.com?
subject=Unsubscribe">
<font color="#FFFFFF">unsubscribe</font></a></b></font></p>

</body>

</html>
----- End forwarded message -----

--------------------------------------------------------------
More than free internet access ... Yucom http://www.yucom.be ! 


From owner-tcp-impl@grc.nasa.gov  Thu Apr  4 16:57:20 2002
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Subject: Fwd: Is this what you wanted....
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Thanks for abusing my address....

----- Forwarded message from Jessie <sexy69@usa.net> -----
Date: Thu, 4 Apr 2002 07:11:38 -0500
From: Jessie <sexy69@usa.net>
Reply-To: Jessie <sexy69@usa.net>
Subject: Is this what you wanted....
To: tcp-impl@grc.nasa.gov

<html>

<head>
<meta http-equiv="Content-Language" content="en-us">
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
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<title>THE BEST WEB CAMS ON THE NET</title>
</head>

<body bgcolor="#003399">

<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FFFFFF" size="6">THE 
BEST WEB CAMS 
ON THE NET</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FF0000" 
size="6">EXCLUSIVE LIVE 
PERSONAL WEB-CAMS!!!</font></b></p>
<p align="center"><b><font face="Haettenschweiler" size="6" 
color="#FFFFFF">Do 
you want to watch me play with myself all night long </font>
<font size="6" color="#FFFFFF" face="Arial">;)</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" size="7" color="#FFFF00">
<a href="http://7814731399"><font color="#FFFF00">CLICK HERE FOR
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<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center"><font color="#FFFFFF">This following pages 
contain adult 
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From owner-tcp-impl@grc.nasa.gov  Thu Apr  4 16:57:31 2002
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Thanks for abusing my address....


----- Forwarded message from Jessie <sexy69@usa.net> -----
Date: Thu, 4 Apr 2002 07:11:27 -0500
From: Jessie <sexy69@usa.net>
Reply-To: Jessie <sexy69@usa.net>
Subject: Is this what you wanted....
To: tcp-impl@grc.nasa.gov

<html>

<head>
<meta http-equiv="Content-Language" content="en-us">
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type" content="text/html; 
charset=windows-1252">
<title>THE BEST WEB CAMS ON THE NET</title>
</head>

<body bgcolor="#003399">

<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FFFFFF" size="6">THE 
BEST WEB CAMS 
ON THE NET</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" color="#FF0000" 
size="6">EXCLUSIVE LIVE 
PERSONAL WEB-CAMS!!!</font></b></p>
<p align="center"><b><font face="Haettenschweiler" size="6" 
color="#FFFFFF">Do 
you want to watch me play with myself all night long </font>
<font size="6" color="#FFFFFF" face="Arial">;)</font></b></p>
<p align="center"><b>
<font face="Franklin Gothic Medium" size="7" color="#FFFF00">
<a href="http://7814731399"><font color="#FFFF00">CLICK HERE FOR
ACCESS</font></a></font></b></p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center">&nbsp;</p>
<p align="center"><font color="#FFFFFF">This following pages 
contain adult 
material. Do not enter if you are not at least 18 years of age!!!
</font></p>
<p align="center"><font color="#FFFFFF">To be removed from our 
mailing list 
click <b>
<a href="mailto:unsub-8168036-91@william.monsterjoke.com?
subject=Unsubscribe">
<font color="#FFFFFF">unsubscribe</font></a></b></font></p>

</body>

</html>
----- End forwarded message -----

--------------------------------------------------------------
More than free internet access ... Yucom http://www.yucom.be ! 


From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 13:41:32 2002
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From: Michael Smith <msmith@corp.iready.com>
To: Robin Uyeshiro <ruyeshiro@iready.com>,
        "'l.wood@eim.surrey.ac.uk'" <l.wood@eim.surrey.ac.uk>,
        "'mankin@isi.edu'" <mankin@ISI.EDU>, tcp-impl@grc.nasa.gov,
        "'tcp-impl@egroups.com'" <tcp-impl@egroups.com>
Cc: Michael Smith <msmith@corp.iready.com>
Subject: RE: TCP Checksum Interoperability
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Lloyd: your comment is interesting.

I know there hasn't been much activity on tcp-impl, but it's still there.
Allison sent an email a while back encouraging it's use, but I can't find
that just now.

To subscribe (or unsubscribe) to the tcp-impl mailing list, send mail to
majordomo@grc.nasa.gov with one of the following in the body of the message.


subscribe tcp-impl 

unsubscribe tcp-impl 

There's also http://groups.yahoo.com/group/tcp-impl/ but activity there
stopped about July 2001. I never understood how the two mailing lists
related, but I posted your mail (below) to both, I hope you don't mind.

Aloha

Mike Smith
CTO, iReady

-----Original Message-----
From: Lloyd Wood [mailto:l.wood@eim.surrey.ac.uk]
Sent: Friday, April 05, 2002 4:43 AM
To: Chris Trobridge
Cc: ietf@ietf.org
Subject: Re: TCP Checksum Interoperability


See sections 3-5 of RFC1624 for discussion of the one's complement
problem for the IP header checksum. I presume similar applies for TCP,
although I don't know offhand if it's written down anywhere.

L.


On Fri, 5 Apr 2002, Chris Trobridge wrote:

> I writing to this list because the TCP workgroup was shutdown a while ago.
>
> We have a compatibility problem between two third party implementations of
> the TCP checksum.
>
> The problem concerns the representation of zero, which has two 1-s
> complement representations (0000 and ffff).
>
> We don't have source to either stack but I managed to deduce the problem
> from looking at a packet trace.  The receiver drops all datagrams
containing
> a TCP with a TCP checksum of ffff.
>
> The receiver appears to be following the checksum procedure in the RFC
> literally - ie zero checksum, recalculate and check that the result is the
> complement of what the sender sent.  The problem is that the sender and
> receiver don't agree about zero and hence the datagram is dropped
silently.
>
> My view is that the receiver is in error; it should be checking the
special
> case of 0.
>
> All the receiver code I have seen doesn't work this way.  The normal
> approach is to calculate the1-s complement sum with checksum in place and
> check that this is zero.  The methods I konw always return just one
> representation for zero, hence there is no special case.
>
> Any thoughts?
>
> Thanks,
> Chris
>


stupid autoappended signatures below.

>
>
----------------------------------------------------------------------------
-------------------------------------
> The information contained in this message is confidential and is intended
> for the addressee(s) only.  If you have received this message in error or
> there are any problems please notify the originator immediately.  The
> unauthorized use, disclosure, copying or alteration of this message is
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direct,
> special, indirect or consequential damages arising from alteration of the
> contents of this message by a third party or as a result of any virus
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> passed on.
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> In addition, certain Marketing collateral may be added from time to time
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> appearance at trade shows and conferences.
>
> This footnote confirms that this email message has been swept by
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>

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>


-
This message was passed through ietf_censored@carmen.ipv6.cselt.it, which
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charset=3Diso-8859-1">
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5.5.2653.12">
<TITLE>RE: TCP Checksum Interoperability</TITLE>
</HEAD>
<BODY>

<P><FONT SIZE=3D2>Lloyd: your comment is interesting.</FONT>
</P>

<P><FONT SIZE=3D2>I know there hasn't been much activity on tcp-impl, =
but it's still there. Allison sent an email a while back encouraging =
it's use, but I can't find that just now.</FONT></P>

<P><FONT SIZE=3D2>To subscribe (or unsubscribe) to the tcp-impl mailing =
list, send mail to majordomo@grc.nasa.gov with one of the following in =
the body of the message. </FONT></P>

<P><FONT SIZE=3D2>subscribe tcp-impl </FONT>
</P>

<P><FONT SIZE=3D2>unsubscribe tcp-impl </FONT>
</P>

<P><FONT SIZE=3D2>There's also <A =
HREF=3D"http://groups.yahoo.com/group/tcp-impl/" =
TARGET=3D"_blank">http://groups.yahoo.com/group/tcp-impl/</A> but =
activity there stopped about July 2001. I never understood how the two =
mailing lists related, but I posted your mail (below) to both, I hope =
you don't mind.</FONT></P>

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

<P><FONT SIZE=3D2>Mike Smith</FONT>
<BR><FONT SIZE=3D2>CTO, iReady</FONT>
</P>

<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Lloyd Wood [<A =
HREF=3D"mailto:l.wood@eim.surrey.ac.uk">mailto:l.wood@eim.surrey.ac.uk</=
A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Friday, April 05, 2002 4:43 AM</FONT>
<BR><FONT SIZE=3D2>To: Chris Trobridge</FONT>
<BR><FONT SIZE=3D2>Cc: ietf@ietf.org</FONT>
<BR><FONT SIZE=3D2>Subject: Re: TCP Checksum Interoperability</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>See sections 3-5 of RFC1624 for discussion of the =
one's complement</FONT>
<BR><FONT SIZE=3D2>problem for the IP header checksum. I presume =
similar applies for TCP,</FONT>
<BR><FONT SIZE=3D2>although I don't know offhand if it's written down =
anywhere.</FONT>
</P>

<P><FONT SIZE=3D2>L.</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>On Fri, 5 Apr 2002, Chris Trobridge wrote:</FONT>
</P>

<P><FONT SIZE=3D2>&gt; I writing to this list because the TCP workgroup =
was shutdown a while ago.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; We have a compatibility problem between two =
third party implementations of</FONT>
<BR><FONT SIZE=3D2>&gt; the TCP checksum.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; The problem concerns the representation of =
zero, which has two 1-s</FONT>
<BR><FONT SIZE=3D2>&gt; complement representations (0000 and =
ffff).</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; We don't have source to either stack but I =
managed to deduce the problem</FONT>
<BR><FONT SIZE=3D2>&gt; from looking at a packet trace.&nbsp; The =
receiver drops all datagrams containing</FONT>
<BR><FONT SIZE=3D2>&gt; a TCP with a TCP checksum of ffff.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; The receiver appears to be following the =
checksum procedure in the RFC</FONT>
<BR><FONT SIZE=3D2>&gt; literally - ie zero checksum, recalculate and =
check that the result is the</FONT>
<BR><FONT SIZE=3D2>&gt; complement of what the sender sent.&nbsp; The =
problem is that the sender and</FONT>
<BR><FONT SIZE=3D2>&gt; receiver don't agree about zero and hence the =
datagram is dropped silently.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; My view is that the receiver is in error; it =
should be checking the special</FONT>
<BR><FONT SIZE=3D2>&gt; case of 0.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; All the receiver code I have seen doesn't work =
this way.&nbsp; The normal</FONT>
<BR><FONT SIZE=3D2>&gt; approach is to calculate the1-s complement sum =
with checksum in place and</FONT>
<BR><FONT SIZE=3D2>&gt; check that this is zero.&nbsp; The methods I =
konw always return just one</FONT>
<BR><FONT SIZE=3D2>&gt; representation for zero, hence there is no =
special case.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; Any thoughts?</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; Thanks,</FONT>
<BR><FONT SIZE=3D2>&gt; Chris</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>stupid autoappended signatures below.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; =
------------------------------------------------------------------------=
-----------------------------------------</FONT>
<BR><FONT SIZE=3D2>&gt; The information contained in this message is =
confidential and is intended</FONT>
<BR><FONT SIZE=3D2>&gt; for the addressee(s) only.&nbsp; If you have =
received this message in error or</FONT>
<BR><FONT SIZE=3D2>&gt; there are any problems please notify the =
originator immediately.&nbsp; The</FONT>
<BR><FONT SIZE=3D2>&gt; unauthorized use, disclosure, copying or =
alteration of this message is</FONT>
<BR><FONT SIZE=3D2>&gt; strictly forbidden. Baltimore Technologies plc =
will not be liable for direct,</FONT>
<BR><FONT SIZE=3D2>&gt; special, indirect or consequential damages =
arising from alteration of the</FONT>
<BR><FONT SIZE=3D2>&gt; contents of this message by a third party or as =
a result of any virus being</FONT>
<BR><FONT SIZE=3D2>&gt; passed on.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; In addition, certain Marketing collateral may =
be added from time to time to</FONT>
<BR><FONT SIZE=3D2>&gt; promote Baltimore Technologies products, =
services, Global e-Security or</FONT>
<BR><FONT SIZE=3D2>&gt; appearance at trade shows and =
conferences.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; This footnote confirms that this email message =
has been swept by</FONT>
<BR><FONT SIZE=3D2>&gt; Baltimore MIMEsweeper for Content Security =
threats, including</FONT>
<BR><FONT SIZE=3D2>&gt; computer viruses.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
</P>

<P><FONT SIZE=3D2>&lt;L.Wood@surrey.ac.uk&gt;PGP&lt;<A =
HREF=3D"http://www.ee.surrey.ac.uk/Personal/L.Wood/" =
TARGET=3D"_blank">http://www.ee.surrey.ac.uk/Personal/L.Wood/</A>&gt;</F=
ONT>
</P>
<BR>

<P><FONT SIZE=3D2>-</FONT>
<BR><FONT SIZE=3D2>This message was passed through =
ietf_censored@carmen.ipv6.cselt.it, which</FONT>
<BR><FONT SIZE=3D2>is a sublist of ietf@ietf.org. Not all messages are =
passed.</FONT>
<BR><FONT SIZE=3D2>Decisions on what to pass are made solely by =
Raffaele D'Albenzio.</FONT>
</P>

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From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 14:24:18 2002
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Message-ID: <3CADF78E.D9E24D26@cisco.com>
Date: Fri, 05 Apr 2002 11:14:22 -0800
From: Murali Bashyam <mbashyam@cisco.com>
Organization: Cisco Systems Inc
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To: tcp-impl@grc.nasa.gov
Subject: Unacceptable ACK in SYN_RCVD state handling
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Hi

In SYN_RECEIVED state after sending a SYN-ACK to the peer, when TCP
receives a unacceptable ACK
i.e the ACK lies outside the receive window, it is supposed to drop the
incoming ACK and respond with a pure ACK as it should for any packet
that is completely outside the receive window. This is reqd as per RFC
793.

In BSD TCP code (FREEBSD/NETBSD) i notice that in SYN-RECEIVED state any

outgoing segment generated would carry the SYN bit as well as the ACK
bit set. So BSD code, when it responds with a ACK in the above scenario
also has the SYN bit set. Is this acceptable behaviour? Linux responds
with a pure ACK in this scenario.

Murali





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From: Michael Smith <msmith@corp.iready.com>
To: Michael Smith <msmith@corp.iready.com>,
        "'CTrobridge@baltimore.com'" <CTrobridge@baltimore.com>,
        "'sra+ietf@hactrn.net'" <sra+ietf@hactrn.net>,
        "'L.Wood@surrey.ac.uk'" <L.Wood@surrey.ac.uk>,
        "'ietf@IETF.ORG'" <ietf@ietf.org>,
        "'tcp-impl@grc.nasa.gov'" <tcp-impl@grc.nasa.gov>
Subject: RE: TCP Checksum Interoperability
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I'm cross-posting this thread to tcp-impl@grc.nasa.gov for archival
purposes, we'll see if any further replies to the ietf list get posted at
tcp-impl@grc.nasa.gov too (for instructions to join tcp-impl, see below). My
rationale here is just to try and keep tcp-impl as a good source of material
on tcp/ip implementation issues. It seems you can't post to
'tcp-impl@egroups.com' (see also below for discussion on this group).

Sorry, Chris, forgot to copy you on this.

Aloha

Mike Smith
CTO, iReady

To: ietf@IETF.ORG 
Subject: Re: TCP Checksum Interoperability 
From: Rob Austein <sra+ietf@hactrn.net> 
Date: Fri, 05 Apr 2002 14:29:44 -0500 
In-Reply-To: <F86F34FDF1F9D411B7A40008C74C27B853776C@baltimore.com> 
References: <F86F34FDF1F9D411B7A40008C74C27B853776C@baltimore.com> 
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(Kasanui) Emacs/20.7 (i386--freebsd) MULE/4.0 (HANANOEN) 

----------------------------------------------------------------------------
----

The last time this came up for a TCP implementation I used to
maintain, our interpretation of Robustness Principle applied to this
problem dictated that we shouldn't send segments with checksum fields
set to all ones (that is, we shouldn't send ~(+0)), but that we had to
accept either ~(+0) or ~(-0) in received segments.

Strictly speaking, either zero state is completely legal, but one is
(apparently) more surprising to most implementors than the other, due
to the implementation techniques that suggest themselves on most
modern processors.



-----Original Message-----
From: Michael Smith 
Sent: Friday, April 05, 2002 10:39 AM
To: 'tcp-impl@egroups.com'
Cc: Michael Smith
Subject: RE: TCP Checksum Interoperability


Lloyd: your comment is interesting.

I know there hasn't been much activity on tcp-impl, but it's still there.
Allison sent an email a while back encouraging it's use, but I can't find
that just now.

To subscribe (or unsubscribe) to the tcp-impl mailing list, send mail to
majordomo@grc.nasa.gov with one of the following in the body of the message.


subscribe tcp-impl 

unsubscribe tcp-impl 

There's also http://groups.yahoo.com/group/tcp-impl/ but activity there
stopped about July 2001. I never understood how the two mailing lists
related, but I posted your mail (below) to both, I hope you don't mind.

Aloha

Mike Smith
CTO, iReady

-----Original Message-----
From: Lloyd Wood [mailto:l.wood@eim.surrey.ac.uk]
Sent: Friday, April 05, 2002 4:43 AM
To: Chris Trobridge
Cc: ietf@ietf.org
Subject: Re: TCP Checksum Interoperability


See sections 3-5 of RFC1624 for discussion of the one's complement
problem for the IP header checksum. I presume similar applies for TCP,
although I don't know offhand if it's written down anywhere.

L.


On Fri, 5 Apr 2002, Chris Trobridge wrote:

> I writing to this list because the TCP workgroup was shutdown a while ago.
>
> We have a compatibility problem between two third party implementations of
> the TCP checksum.
>
> The problem concerns the representation of zero, which has two 1-s
> complement representations (0000 and ffff).
>
> We don't have source to either stack but I managed to deduce the problem
> from looking at a packet trace.  The receiver drops all datagrams
containing
> a TCP with a TCP checksum of ffff.
>
> The receiver appears to be following the checksum procedure in the RFC
> literally - ie zero checksum, recalculate and check that the result is the
> complement of what the sender sent.  The problem is that the sender and
> receiver don't agree about zero and hence the datagram is dropped
silently.
>
> My view is that the receiver is in error; it should be checking the
special
> case of 0.
>
> All the receiver code I have seen doesn't work this way.  The normal
> approach is to calculate the1-s complement sum with checksum in place and
> check that this is zero.  The methods I konw always return just one
> representation for zero, hence there is no special case.
>
> Any thoughts?
>
> Thanks,
> Chris
>


stupid autoappended signatures below.

>
>
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> The information contained in this message is confidential and is intended
> for the addressee(s) only.  If you have received this message in error or
> there are any problems please notify the originator immediately.  The
> unauthorized use, disclosure, copying or alteration of this message is
> strictly forbidden. Baltimore Technologies plc will not be liable for
direct,
> special, indirect or consequential damages arising from alteration of the
> contents of this message by a third party or as a result of any virus
being
> passed on.
>
> In addition, certain Marketing collateral may be added from time to time
to
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> appearance at trade shows and conferences.
>
> This footnote confirms that this email message has been swept by
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>

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>


-
This message was passed through ietf_censored@carmen.ipv6.cselt.it, which
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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charset=3Diso-8859-1">
<META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
5.5.2653.12">
<TITLE>RE: TCP Checksum Interoperability</TITLE>
</HEAD>
<BODY>

<P><FONT SIZE=3D2>I'm cross-posting this thread to =
tcp-impl@grc.nasa.gov for archival purposes, we'll see if any further =
replies to the ietf list get posted at tcp-impl@grc.nasa.gov too (for =
instructions to join tcp-impl, see below). My rationale here is just to =
try and keep tcp-impl as a good source of material on tcp/ip =
implementation issues. It seems you can't post to =
'tcp-impl@egroups.com' (see also below for discussion on this =
group).</FONT></P>

<P><FONT SIZE=3D2>Sorry, Chris, forgot to copy you on this.</FONT>
</P>

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

<P><FONT SIZE=3D2>Mike Smith</FONT>
<BR><FONT SIZE=3D2>CTO, iReady</FONT>
</P>

<P><FONT SIZE=3D2>To: ietf@IETF.ORG </FONT>
<BR><FONT SIZE=3D2>Subject: Re: TCP Checksum Interoperability </FONT>
<BR><FONT SIZE=3D2>From: Rob Austein &lt;sra+ietf@hactrn.net&gt; =
</FONT>
<BR><FONT SIZE=3D2>Date: Fri, 05 Apr 2002 14:29:44 -0500 </FONT>
<BR><FONT SIZE=3D2>In-Reply-To: =
&lt;F86F34FDF1F9D411B7A40008C74C27B853776C@baltimore.com&gt; </FONT>
<BR><FONT SIZE=3D2>References: =
&lt;F86F34FDF1F9D411B7A40008C74C27B853776C@baltimore.com&gt; </FONT>
<BR><FONT SIZE=3D2>Reply-To: ietf@IETF.ORG </FONT>
<BR><FONT SIZE=3D2>Sender: owner-ietf@IETF.ORG </FONT>
<BR><FONT SIZE=3D2>User-Agent: Wanderlust/2.4.1 (Stand By Me) =
SEMI/1.13.7 (Awazu) FLIM/1.13.2 (Kasanui) Emacs/20.7 (i386--freebsd) =
MULE/4.0 (HANANOEN) </FONT></P>

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

<P><FONT SIZE=3D2>The last time this came up for a TCP implementation I =
used to</FONT>
<BR><FONT SIZE=3D2>maintain, our interpretation of Robustness Principle =
applied to this</FONT>
<BR><FONT SIZE=3D2>problem dictated that we shouldn't send segments =
with checksum fields</FONT>
<BR><FONT SIZE=3D2>set to all ones (that is, we shouldn't send ~(+0)), =
but that we had to</FONT>
<BR><FONT SIZE=3D2>accept either ~(+0) or ~(-0) in received =
segments.</FONT>
</P>

<P><FONT SIZE=3D2>Strictly speaking, either zero state is completely =
legal, but one is</FONT>
<BR><FONT SIZE=3D2>(apparently) more surprising to most implementors =
than the other, due</FONT>
<BR><FONT SIZE=3D2>to the implementation techniques that suggest =
themselves on most</FONT>
<BR><FONT SIZE=3D2>modern processors.</FONT>
</P>
<BR>
<BR>

<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Michael Smith </FONT>
<BR><FONT SIZE=3D2>Sent: Friday, April 05, 2002 10:39 AM</FONT>
<BR><FONT SIZE=3D2>To: 'tcp-impl@egroups.com'</FONT>
<BR><FONT SIZE=3D2>Cc: Michael Smith</FONT>
<BR><FONT SIZE=3D2>Subject: RE: TCP Checksum Interoperability</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Lloyd: your comment is interesting.</FONT>
</P>

<P><FONT SIZE=3D2>I know there hasn't been much activity on tcp-impl, =
but it's still there. Allison sent an email a while back encouraging =
it's use, but I can't find that just now.</FONT></P>

<P><FONT SIZE=3D2>To subscribe (or unsubscribe) to the tcp-impl mailing =
list, send mail to majordomo@grc.nasa.gov with one of the following in =
the body of the message. </FONT></P>

<P><FONT SIZE=3D2>subscribe tcp-impl </FONT>
</P>

<P><FONT SIZE=3D2>unsubscribe tcp-impl </FONT>
</P>

<P><FONT SIZE=3D2>There's also <A =
HREF=3D"http://groups.yahoo.com/group/tcp-impl/" =
TARGET=3D"_blank">http://groups.yahoo.com/group/tcp-impl/</A> but =
activity there stopped about July 2001. I never understood how the two =
mailing lists related, but I posted your mail (below) to both, I hope =
you don't mind.</FONT></P>

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

<P><FONT SIZE=3D2>Mike Smith</FONT>
<BR><FONT SIZE=3D2>CTO, iReady</FONT>
</P>

<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Lloyd Wood [<A =
HREF=3D"mailto:l.wood@eim.surrey.ac.uk">mailto:l.wood@eim.surrey.ac.uk</=
A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Friday, April 05, 2002 4:43 AM</FONT>
<BR><FONT SIZE=3D2>To: Chris Trobridge</FONT>
<BR><FONT SIZE=3D2>Cc: ietf@ietf.org</FONT>
<BR><FONT SIZE=3D2>Subject: Re: TCP Checksum Interoperability</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>See sections 3-5 of RFC1624 for discussion of the =
one's complement</FONT>
<BR><FONT SIZE=3D2>problem for the IP header checksum. I presume =
similar applies for TCP,</FONT>
<BR><FONT SIZE=3D2>although I don't know offhand if it's written down =
anywhere.</FONT>
</P>

<P><FONT SIZE=3D2>L.</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>On Fri, 5 Apr 2002, Chris Trobridge wrote:</FONT>
</P>

<P><FONT SIZE=3D2>&gt; I writing to this list because the TCP workgroup =
was shutdown a while ago.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; We have a compatibility problem between two =
third party implementations of</FONT>
<BR><FONT SIZE=3D2>&gt; the TCP checksum.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; The problem concerns the representation of =
zero, which has two 1-s</FONT>
<BR><FONT SIZE=3D2>&gt; complement representations (0000 and =
ffff).</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; We don't have source to either stack but I =
managed to deduce the problem</FONT>
<BR><FONT SIZE=3D2>&gt; from looking at a packet trace.&nbsp; The =
receiver drops all datagrams containing</FONT>
<BR><FONT SIZE=3D2>&gt; a TCP with a TCP checksum of ffff.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; The receiver appears to be following the =
checksum procedure in the RFC</FONT>
<BR><FONT SIZE=3D2>&gt; literally - ie zero checksum, recalculate and =
check that the result is the</FONT>
<BR><FONT SIZE=3D2>&gt; complement of what the sender sent.&nbsp; The =
problem is that the sender and</FONT>
<BR><FONT SIZE=3D2>&gt; receiver don't agree about zero and hence the =
datagram is dropped silently.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; My view is that the receiver is in error; it =
should be checking the special</FONT>
<BR><FONT SIZE=3D2>&gt; case of 0.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; All the receiver code I have seen doesn't work =
this way.&nbsp; The normal</FONT>
<BR><FONT SIZE=3D2>&gt; approach is to calculate the1-s complement sum =
with checksum in place and</FONT>
<BR><FONT SIZE=3D2>&gt; check that this is zero.&nbsp; The methods I =
konw always return just one</FONT>
<BR><FONT SIZE=3D2>&gt; representation for zero, hence there is no =
special case.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; Any thoughts?</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; Thanks,</FONT>
<BR><FONT SIZE=3D2>&gt; Chris</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>stupid autoappended signatures below.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; =
------------------------------------------------------------------------=
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<BR><FONT SIZE=3D2>&gt; The information contained in this message is =
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<BR><FONT SIZE=3D2>&gt; for the addressee(s) only.&nbsp; If you have =
received this message in error or</FONT>
<BR><FONT SIZE=3D2>&gt; there are any problems please notify the =
originator immediately.&nbsp; The</FONT>
<BR><FONT SIZE=3D2>&gt; unauthorized use, disclosure, copying or =
alteration of this message is</FONT>
<BR><FONT SIZE=3D2>&gt; strictly forbidden. Baltimore Technologies plc =
will not be liable for direct,</FONT>
<BR><FONT SIZE=3D2>&gt; special, indirect or consequential damages =
arising from alteration of the</FONT>
<BR><FONT SIZE=3D2>&gt; contents of this message by a third party or as =
a result of any virus being</FONT>
<BR><FONT SIZE=3D2>&gt; passed on.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; In addition, certain Marketing collateral may =
be added from time to time to</FONT>
<BR><FONT SIZE=3D2>&gt; promote Baltimore Technologies products, =
services, Global e-Security or</FONT>
<BR><FONT SIZE=3D2>&gt; appearance at trade shows and =
conferences.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt; This footnote confirms that this email message =
has been swept by</FONT>
<BR><FONT SIZE=3D2>&gt; Baltimore MIMEsweeper for Content Security =
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<P><FONT SIZE=3D2>&lt;L.Wood@surrey.ac.uk&gt;PGP&lt;<A =
HREF=3D"http://www.ee.surrey.ac.uk/Personal/L.Wood/" =
TARGET=3D"_blank">http://www.ee.surrey.ac.uk/Personal/L.Wood/</A>&gt;</F=
ONT>
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<P><FONT SIZE=3D2>-</FONT>
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From: Michael Smith <msmith@corp.iready.com>
To: "'touch@ISI.EDU'" <touch@ISI.EDU>,
        "'tcp-impl@grc.nasa.gov'" <tcp-impl@grc.nasa.gov>
Cc: Michael Smith <msmith@corp.iready.com>
Subject: Re: TCP Checksum Interoperability
Date: Fri, 5 Apr 2002 11:50:29 -0800 
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Forwarding post from ietf list to 'tcp-impl@grc.nasa.gov' (I'm desperately
hoping this doesn't go on for much longer).

Mike Smith
CTO, iReady


Re: TCP Checksum Interoperability



To: Lloyd Wood <L.Wood@eim.surrey.ac.uk> 
Subject: Re: TCP Checksum Interoperability 
From: Joe Touch <touch@ISI.EDU> 
Date: Fri, 05 Apr 2002 11:41:08 -0800 
CC: Chris Trobridge <CTrobridge@baltimore.com>, ietf@IETF.ORG 
References:
<Pine.SOL.4.43.0204051531440.5049-100000@phaestos.ee.surrey.ac.uk> 
Sender: owner-ietf@IETF.ORG 
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.9)
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Lloyd Wood wrote:
> See sections 3-5 of RFC1624 for discussion of the one's complement
> problem for the IP header checksum. I presume similar applies for TCP,
> although I don't know offhand if it's written down anywhere.

RFC793 describes the use of 1's complement as the TCP checksum.

A TCP checksum can never be 0x0000, by the same argument of RFC1624, 
since the TCP header length is never 0.

Most of RFC1624 is clarification of the mathematical properties of 1's 
complement arithmetic; it's not specific to IP.

>>We have a compatibility problem between two third party implementations of
>>the TCP checksum.
>>
>>The problem concerns the representation of zero, which has two 1-s
>>complement representations (0000 and ffff).
>>
>>We don't have source to either stack but I managed to deduce the problem
>>from looking at a packet trace.  The receiver drops all datagrams
containing
>>a TCP with a TCP checksum of ffff.
>>
>>The receiver appears to be following the checksum procedure in the RFC
>>literally - ie zero checksum, recalculate and check that the result is the
>>complement of what the sender sent.  The problem is that the sender and
>>receiver don't agree about zero and hence the datagram is dropped
silently.
>>
>>My view is that the receiver is in error; it should be checking the
special
>>case of 0.

The sender is in error. As noted in RFC1624, there is no summation of 
words which yields a 1's complement sum of 0x0000 except all zeroes, 
which can't occur because (as above) the TCP header length renders at 
least one word non-zero.

Since the TCP checksum is the 1's complement of the sum, and 0x0000 
cannot occur as a sum, 0xffff cannot occur as a valid TCP checksum.

It would be useful to check the math used at the source to compute the 
checksum. It is likely there is an error, in particular, see section 3 
of RFC1624 for one typical one.

>>All the receiver code I have seen doesn't work this way.  The normal
>>approach is to calculate the1-s complement sum with checksum in place and
>>check that this is zero.  The methods I konw always return just one
>>representation for zero, hence there is no special case.

As per RFC1624, that depends on the inputs. Nonzero inputs generate only 
0xffff as a sum, it takes all-zeroes to generate 0x0000 as a sum, but, 
as per above, that can't occur.

Joe





References: 
Re: TCP Checksum Interoperability 
From: Lloyd Wood <l.wood@eim.surrey.ac.uk>
Prev by Date: Re: draft-iab-unsaf-considerations-01.txt 
Prev by thread: Re: TCP Checksum Interoperability 
Next by thread: Re: TCP Checksum Interoperability 
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<P><FONT SIZE=3D2>Forwarding post from ietf list to =
'tcp-impl@grc.nasa.gov' (I'm desperately hoping this doesn't go on for =
much longer).</FONT>
</P>

<P><FONT SIZE=3D2>Mike Smith</FONT>
<BR><FONT SIZE=3D2>CTO, iReady</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Re: TCP Checksum Interoperability</FONT>
</P>
<BR>
<BR>

<P><FONT SIZE=3D2>To: Lloyd Wood &lt;L.Wood@eim.surrey.ac.uk&gt; =
</FONT>
<BR><FONT SIZE=3D2>Subject: Re: TCP Checksum Interoperability </FONT>
<BR><FONT SIZE=3D2>From: Joe Touch &lt;touch@ISI.EDU&gt; </FONT>
<BR><FONT SIZE=3D2>Date: Fri, 05 Apr 2002 11:41:08 -0800 </FONT>
<BR><FONT SIZE=3D2>CC: Chris Trobridge =
&lt;CTrobridge@baltimore.com&gt;, ietf@IETF.ORG </FONT>
<BR><FONT SIZE=3D2>References: =
&lt;Pine.SOL.4.43.0204051531440.5049-100000@phaestos.ee.surrey.ac.uk&gt;=
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<BR><FONT SIZE=3D2>Sender: owner-ietf@IETF.ORG </FONT>
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</P>
<BR>
<BR>

<P><FONT SIZE=3D2>Lloyd Wood wrote:</FONT>
<BR><FONT SIZE=3D2>&gt; See sections 3-5 of RFC1624 for discussion of =
the one's complement</FONT>
<BR><FONT SIZE=3D2>&gt; problem for the IP header checksum. I presume =
similar applies for TCP,</FONT>
<BR><FONT SIZE=3D2>&gt; although I don't know offhand if it's written =
down anywhere.</FONT>
</P>

<P><FONT SIZE=3D2>RFC793 describes the use of 1's complement as the TCP =
checksum.</FONT>
</P>

<P><FONT SIZE=3D2>A TCP checksum can never be 0x0000, by the same =
argument of RFC1624, </FONT>
<BR><FONT SIZE=3D2>since the TCP header length is never 0.</FONT>
</P>

<P><FONT SIZE=3D2>Most of RFC1624 is clarification of the mathematical =
properties of 1's </FONT>
<BR><FONT SIZE=3D2>complement arithmetic; it's not specific to =
IP.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;&gt;We have a compatibility problem between two =
third party implementations of</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;the TCP checksum.</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;The problem concerns the representation of =
zero, which has two 1-s</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;complement representations (0000 and =
ffff).</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;We don't have source to either stack but I =
managed to deduce the problem</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;from looking at a packet trace.&nbsp; The =
receiver drops all datagrams containing</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;a TCP with a TCP checksum of ffff.</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;The receiver appears to be following the =
checksum procedure in the RFC</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;literally - ie zero checksum, recalculate =
and check that the result is the</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;complement of what the sender sent.&nbsp; =
The problem is that the sender and</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;receiver don't agree about zero and hence =
the datagram is dropped silently.</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;My view is that the receiver is in error; it =
should be checking the special</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;case of 0.</FONT>
</P>

<P><FONT SIZE=3D2>The sender is in error. As noted in RFC1624, there is =
no summation of </FONT>
<BR><FONT SIZE=3D2>words which yields a 1's complement sum of 0x0000 =
except all zeroes, </FONT>
<BR><FONT SIZE=3D2>which can't occur because (as above) the TCP header =
length renders at </FONT>
<BR><FONT SIZE=3D2>least one word non-zero.</FONT>
</P>

<P><FONT SIZE=3D2>Since the TCP checksum is the 1's complement of the =
sum, and 0x0000 </FONT>
<BR><FONT SIZE=3D2>cannot occur as a sum, 0xffff cannot occur as a =
valid TCP checksum.</FONT>
</P>

<P><FONT SIZE=3D2>It would be useful to check the math used at the =
source to compute the </FONT>
<BR><FONT SIZE=3D2>checksum. It is likely there is an error, in =
particular, see section 3 </FONT>
<BR><FONT SIZE=3D2>of RFC1624 for one typical one.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;&gt;All the receiver code I have seen doesn't =
work this way.&nbsp; The normal</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;approach is to calculate the1-s complement =
sum with checksum in place and</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;check that this is zero.&nbsp; The methods I =
konw always return just one</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;representation for zero, hence there is no =
special case.</FONT>
</P>

<P><FONT SIZE=3D2>As per RFC1624, that depends on the inputs. Nonzero =
inputs generate only </FONT>
<BR><FONT SIZE=3D2>0xffff as a sum, it takes all-zeroes to generate =
0x0000 as a sum, but, </FONT>
<BR><FONT SIZE=3D2>as per above, that can't occur.</FONT>
</P>

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

<P><FONT SIZE=3D2>References: </FONT>
<BR><FONT SIZE=3D2>Re: TCP Checksum Interoperability </FONT>
<BR><FONT SIZE=3D2>From: Lloyd Wood =
&lt;l.wood@eim.surrey.ac.uk&gt;</FONT>
<BR><FONT SIZE=3D2>Prev by Date: Re: =
draft-iab-unsaf-considerations-01.txt </FONT>
<BR><FONT SIZE=3D2>Prev by thread: Re: TCP Checksum Interoperability =
</FONT>
<BR><FONT SIZE=3D2>Next by thread: Re: TCP Checksum Interoperability =
</FONT>
<BR><FONT SIZE=3D2>Index(es): </FONT>
<BR><FONT SIZE=3D2>Date </FONT>
<BR><FONT SIZE=3D2>Thread </FONT>
</P>

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From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 15:11:25 2002
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Rob Austein wrote:
> The last time this came up for a TCP implementation I used to
> maintain, our interpretation of Robustness Principle applied to this
> problem dictated that we shouldn't send segments with checksum fields
> set to all ones (that is, we shouldn't send ~(+0)), but that we had to
> accept either ~(+0) or ~(-0) in received segments.
> 
> Strictly speaking, either zero state is completely legal, 

See my other post on this, as per RFC1624 section 3, only one state 
(0x0000) is legal as the complement of the checksum of non-zero data. 
TCP checksummed data must contain at least one nonzero word (the one 
with the TCP header length, which must be >=20).

The receiver is entirely justified in considering 0xffff as an error.

Jeo




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Date: Fri, 05 Apr 2002 12:27:53 -0800
To: Joe Touch <touch@ISI.EDU>
From: Ignacio Goyret <igoyret@lucent.com>
Subject: Re: TCP Checksum Interoperability
Cc: tcp-impl@grc.nasa.gov
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At 12:05 PM 4/5/02 -0800, Joe Touch wrote:
>Rob Austein wrote:
>> The last time this came up for a TCP implementation I used to
>> maintain, our interpretation of Robustness Principle applied to this
>> problem dictated that we shouldn't send segments with checksum fields
>> set to all ones (that is, we shouldn't send ~(+0)), but that we had to
>> accept either ~(+0) or ~(-0) in received segments.
>> 
>> Strictly speaking, either zero state is completely legal, 
>
>See my other post on this, as per RFC1624 section 3, only one state 
>(0x0000) is legal as the complement of the checksum of non-zero data. 
>TCP checksummed data must contain at least one nonzero word (the one 
>with the TCP header length, which must be >=20).
>
>The receiver is entirely justified in considering 0xffff as an error.

I agree. Both 0x0000 and 0xFFFF are distinct results from the checksum
calculation.

My guess is that this confusion radiates from UDP which allows not calculating
checksums. In the UDP case (and this case only), a calculated value of 0x0000
needs to be sent as something else, otherwise, the receiver wouldn't know if
the sender meant "no checksum sent" or "checksum sent is 0".

But this doesn't apply to TCP, where the checksum must always be calculated.



From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 15:49:20 2002
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Subject: RE: TCP Checksum Interoperability
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On Fri, 5 Apr 2002, Michael Smith wrote:

> I know there hasn't been much activity on tcp-impl, but it's still there.

...as evidenced by Elsevier Computer Networks magazine and other spam.


> Allison sent an email a while back encouraging it's use, but I can't find
> that just now.
>
> To subscribe (or unsubscribe) to the tcp-impl mailing list, send mail to
> majordomo@grc.nasa.gov with one of the following in the body of the message.
>
>
> subscribe tcp-impl
>
> unsubscribe tcp-impl
>
> There's also http://groups.yahoo.com/group/tcp-impl/ but activity there
> stopped about July 2001. I never understood how the two mailing lists
> related

I imagine that the egroups thing was subscribed to the real list,
and that this eventually broke after yahoo took over egroups. [egroups
address snipped from cc.]

L.

> but I posted your mail (below) to both, I hope you don't mind.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>



From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 15:52:19 2002
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Date: Fri, 5 Apr 2002 21:44:42 +0100 (BST)
From: Lloyd Wood <l.wood@eim.surrey.ac.uk>
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To: Michael Smith <msmith@corp.iready.com>
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Subject: RE: TCP Checksum Interoperability
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On Fri, 5 Apr 2002, Michael Smith wrote:

> The last time this came up for a TCP implementation I used to
> maintain, our interpretation of Robustness Principle applied to this
> problem dictated that we shouldn't send segments with checksum fields
> set to all ones (that is, we shouldn't send ~(+0)), but that we had to
> accept either ~(+0) or ~(-0) in received segments.
>
> Strictly speaking, either zero state is completely legal

Not so. Please read RFC1624 sections 3-5.

L.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>




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Date: Fri, 05 Apr 2002 16:30:23 -0500
From: Rob Austein <sra+ietf@hactrn.net>
To: tcp-impl@grc.nasa.gov, ietf@ietf.org
Subject: Re: TCP Checksum Interoperability
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--------At Fri, 05 Apr 2002 12:05:33 -0800, Joe Touch wrote:
>
> See my other post on this, as per RFC1624 section 3, only one state 
> (0x0000) is legal as the complement of the checksum of non-zero data. 
> TCP checksummed data must contain at least one nonzero word (the one 
> with the TCP header length, which must be >=20).

RFC 1624 is (a) Informational, and (b) wrong on this point.  RFC 793
just says that it's a one's complement sum and does not dictate the
specific method by which it must be calculated.  The implementation is
free to subtract zero from the sum at any point in the calculation to
prevent overflow (even if the particular value of zero chosen would
happen to look like a very large number when considered as an unsigned
value).  An implementation whose native word size is larger than 16
bits is also free to first perform the summation then fold the results
down to 16 bits by applying mod 0xFFFF.

And yes, once upon a time, people wrote checksum code that worked this
way, at least on PDP-10s at MIT.

The point is not that I'd advise anyone to use these techniques in new
code, just that they're completely legal given what the standard
actually says, and that the robustness principle therefore suggests
that we should accept the checksums they generate.

> The receiver is entirely justified in considering 0xffff as an error.

I disagree, for the reasons given above.


From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 17:19:22 2002
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Date: Fri, 5 Apr 2002 17:09:52 -0500
From: "J. Noel Chiappa" <jnc@ginger.lcs.mit.edu>
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To: ietf@ietf.org, tcp-impl@grc.nasa.gov
Subject: Re: TCP Checksum Interoperability
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    > From: Joe Touch <touch@ISI.EDU>

    >> our interpretation of Robustness Principle applied to this problem
    >> dictated that we .. had to accept either ~(+0) or ~(-0) in received
    >> segments.
    >> Strictly speaking, either zero state is completely legal,

    > as per RFC1624 section 3, only one state (0x0000) is legal as the
    > complement of the checksum of non-zero data. ...
    > ..
    > The receiver is entirely justified in considering 0xffff as an error.

I would tend to disagree strongly with this last line, and agree with the
original statement above.

The TCP (and IP) checksum is defined as "the one's complement of the
one's-complement sum of the packet contents" precisely to allow the following
behaviour: one adds up the incoming packet, *including the checksum as it
sits* (i.e. without having to zero out that field), and then checks to see
that the result is all 1's - which is, as you point out, the only valid zero
value that a one's-complement summation process *of a packet* can compute.

(The only way to get all 0's as a sum of a one's-complement addition
process is to to sum a series of zero's - which a real packet will never
contain.)

Note that if the packet's check sum (i.e. the sum with the checksum field set
to zero) happens to come out to zero (i.e. all one's, before the complement),
then *either* value of zero in the checksum field of the packet will result in
an all-1's sum when the packet is checksummed.

I honestly don't understand why anyone's code even bothers to look at the
actual value in the checksum field of the incoming packet; just do the
checksum of the whole packet, and look at the result.

	Noel

PS: One does have to look at the incoming value for UDP, but that's different.



From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 17:20:14 2002
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Date: Fri, 5 Apr 2002 23:13:47 +0100 (BST)
From: Lloyd Wood <l.wood@eim.surrey.ac.uk>
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Subject: Re: TCP Checksum Interoperability
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On Fri, 5 Apr 2002, Rob Austein wrote:

> --------At Fri, 05 Apr 2002 12:05:33 -0800, Joe Touch wrote:
> >
> > See my other post on this, as per RFC1624 section 3, only one state
> > (0x0000) is legal as the complement of the checksum of non-zero data.
> > TCP checksummed data must contain at least one nonzero word (the one
> > with the TCP header length, which must be >=20).
>
> RFC 1624 is (a) Informational,

It was written before BCP came into being with RFC1818. More accurate
to say that it's not standards-track... I imagine any update
today would be BCP.

> and (b) wrong on this point.  RFC 793
> just says that it's a one's complement sum and does not dictate the
> specific method by which it must be calculated.
>
> The implementation is
> free to subtract zero from the sum at any point in the calculation to
> prevent overflow (even if the particular value of zero chosen would
> happen to look like a very large number when considered as an unsigned
> value).  An implementation whose native word size is larger than 16
> bits is also free to first perform the summation then fold the results
> down to 16 bits by applying mod 0xFFFF.
>
> And yes, once upon a time, people wrote checksum code that worked this
> way, at least on PDP-10s at MIT.
>
> The point is not that I'd advise anyone to use these techniques in new
> code, just that they're completely legal given what the standard
> actually says, and that the robustness principle therefore suggests
> that we should accept the checksums they generate.

and RFC791 claims ttl is in seconds, ergo I don't have to decrement
ttl because I know my traffic is on paths less than a second
long.

Cool reasoning.

L.

> > The receiver is entirely justified in considering 0xffff as an error.
>
> I disagree, for the reasons given above.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>





From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 18:05:02 2002
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Date: Fri, 05 Apr 2002 17:56:13 -0500
From: Rob Austein <sra+ietf@hactrn.net>
To: tcp-impl@grc.nasa.gov, ietf@ietf.org
Subject: Re: TCP Checksum Interoperability
In-Reply-To: <Pine.SOL.4.43.0204052248210.5049-100000@phaestos.ee.surrey.ac.uk>
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At Fri, 5 Apr 2002 23:13:47 +0100 (BST), Lloyd Wood <l.wood@eim.surrey.ac.uk> wrote:
> 
> and RFC791 claims ttl is in seconds, ergo I don't have to decrement
> ttl because I know my traffic is on paths less than a second
> long.

Covered by RFCs 1122 and 1812.


From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 18:18:25 2002
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Date: Fri, 05 Apr 2002 17:13:57 -0600
From: Matt Crawford <crawdad@fnal.gov>
Subject: Re: TCP Checksum Interoperability
In-reply-to: "05 Apr 2002 23:13:47 +0100."
 <Pine.SOL.4.43.0204052248210.5049-100000@phaestos.ee.surrey.ac.uk>
To: Lloyd Wood <L.Wood@eim.surrey.ac.uk>
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> and RFC791 claims ttl is in seconds, ergo I don't have to decrement
> ttl because I know my traffic is on paths less than a second
> long.
> 
> Cool reasoning.

You lose -- 791 says you have to subtract at least 1 from TTL even if.

However, I think that (A) most or all extant IPv4 routers violate 791
if they happen hold a packet more than a second, and (B) IPv6
invalidated TCP's correctness by defining the Hop Limit field to be a
hop limit and have no connection to time.  A TCP riding on IPv6 may
receive old segments an unbounded time later without any other
network element breaking a spec.

I said so at the time, but nobody cared.  No doubt Vint will take
care of multi-second hops for us.


From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 18:34:01 2002
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Subject: Re: TCP Checksum Interoperability
To: crawdad@fnal.gov (Matt Crawford)
Date: Sat, 6 Apr 2002 00:44:06 +0100 (BST)
Cc: L.Wood@eim.surrey.ac.uk (Lloyd Wood), tcp-impl@grc.nasa.gov
In-Reply-To: <200204052313.g35NDvZ10445@gungnir.fnal.gov> from "Matt Crawford" at Apr 05, 2002 05:13:57 PM
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> hop limit and have no connection to time.  A TCP riding on IPv6 may
> receive old segments an unbounded time later without any other
> network element breaking a spec.

This was true with IPv4. A satellite link or a store and forward physical
layer can have multi-second timings anyway. Take RFC1149 for an obvious extreme
example. In the experimental study the packet dispatch time was a relatively low
proportion and the flight time is not visible to the router nor was the
large amount of flapping.

But we know TCP is broken. The late Ian Heavans wrote a nice draft on the 
subject.


From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 18:45:28 2002
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Date: Sat, 6 Apr 2002 00:37:35 +0100 (BST)
From: Lloyd Wood <l.wood@eim.surrey.ac.uk>
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Cc: tcp-impl@grc.nasa.gov, <ietf@ietf.org>
Subject: Re: TCP Checksum Interoperability
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On Fri, 5 Apr 2002, Rob Austein wrote:

> At Fri, 5 Apr 2002 23:13:47 +0100 (BST), Lloyd Wood <l.wood@eim.surrey.ac.uk> wrote:
> >
> > and RFC791 claims ttl is in seconds, ergo I don't have to decrement
> > ttl because I know my traffic is on paths less than a second
> > long.
>
> Covered by RFCs 1122 and 1812.

gee, 1812 isn't a standards document, and is updated by 2644, which
isn't a standards document either.

as for 1122, it's requirements for internet hosts, not requirements
for internet gateways... but matt points out,

$ You lose -- 791 says you have to subtract at least 1 from TTL even if.

damn. should have picked an option case instead.

L.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>







From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 18:53:41 2002
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From: Lloyd Wood <l.wood@eim.surrey.ac.uk>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Matt Crawford <crawdad@fnal.gov>, <tcp-impl@grc.nasa.gov>
Subject: Re: TCP Checksum Interoperability
In-Reply-To: <E16tdNG-0000uh-00@the-village.bc.nu>
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On Sat, 6 Apr 2002, Alan Cox wrote:

> > hop limit and have no connection to time.  A TCP riding on IPv6 may
> > receive old segments an unbounded time later without any other
> > network element breaking a spec.
>
> This was true with IPv4. A satellite link or a store and forward physical
> layer can have multi-second timings anyway. Take RFC1149 for an obvious extreme
> example. In the experimental study the packet dispatch time was a relatively low
> proportion and the flight time is not visible to the router nor was the
> large amount of flapping.
>
> But we know TCP is broken. The late Ian Heavans wrote a nice draft on the
> subject.

you mean RFC2525? Not all his work got lost...

http://watersprings.org/cgi-bin/namazu.cgi?query=heavens&idxname=id

L.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>



From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 19:28:55 2002
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From: der Mouse <mouse@Rodents.Montreal.QC.CA>
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To: tcp-impl@grc.nasa.gov
Subject: Re: TCP Checksum Interoperability
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> The TCP (and IP) checksum is defined as "the one's complement of the
> one's-complement sum of the packet contents" [...]

> (The only way to get all 0's as a sum of a one's-complement addition
> process is to to sum a series of zero's - which a real packet will
> never contain.)

...huh?  It depends on how you implement one's-complement arithmetic.

Consider, for example, "do two's-complement adds and reduce the result
mod 0xffff", which may be suitable on a machine with fast hardware mod,
and which can never produce 0xffff.

In 16-bit one's-complement arithmetic, 0x0000 and 0xffff are
equivalent, not only on input but also on output.  Trying to draw an
artificial distinction between them is not only unsupported by the
standard as far as I can tell but liable to break interoperability with
conformant implementations which don't draw that distinction.

> Note that if the packet's check sum (i.e. the sum with the checksum
> field set to zero) happens to come out to zero (i.e. all one's,
> before the complement), then *either* value of zero in the checksum
> field of the packet will result in an all-1's sum when the packet is
> checksummed.

...unless the packet checksumming is done in a way that generates
0x0000 instead of 0xffff when the sum is (one's-complement) zero.

> I honestly don't understand why anyone's code even bothers to look at
> the actual value in the checksum field of the incoming packet; just
> do the checksum of the whole packet, and look at the result.

With that I agree.

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From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 19:36:45 2002
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>> A TCP riding on IPv6 may receive old segments an unbounded time
>> later without any other network element breaking a spec.
> This was true with IPv4.

No; the TTL is specified in seconds, with the additional note that it
must be decremented by at least one per hop even if the hop takes less
than a second.  Hops that take multiple seconds but decrement the TTL
by only one are out of spec for IPv4.

That's not to say that they're nonexistent, uncommon, or even that they
break stuff in practice.  Heck, I've seen ping show me RTTs upwards of
40 seconds, without even having to resort to avian carriers.  But they
_are_ spec violations.

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From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 19:57:00 2002
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Date: Fri, 05 Apr 2002 19:47:57 -0500
From: vint cerf <vinton.g.cerf@wcom.com>
Subject: Re: TCP Checksum Interoperability
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:-)

At 05:13 PM 4/5/2002 -0600, Matt Crawford wrote:
>I said so at the time, but nobody cared.  No doubt Vint will take
>care of multi-second hops for us.



From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 20:25:53 2002
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Date: Fri, 05 Apr 2002 17:17:48 -0800
To: Matt Crawford <crawdad@fnal.gov>
From: Fred Baker <fred@cisco.com>
Subject: Re: TCP Checksum Interoperability
Cc: Lloyd Wood <L.Wood@eim.surrey.ac.uk>, ietf@ietf.org, tcp-impl@grc.nasa.gov
In-Reply-To: <200204052313.g35NDvZ10445@gungnir.fnal.gov>
References: <"05 Apr 2002 23:13:47 +0100." <Pine.SOL.4.43.0204052248210.5049-100000@phaestos.ee.surrey.ac.uk>
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At 03:13 PM 4/5/2002, Matt Crawford wrote:
>I think that (A) most or all extant IPv4 routers violate 791
>if they happen hold a packet more than a second, and (B) IPv6
>invalidated TCP's correctness by defining the Hop Limit field to be a
>hop limit and have no connection to time.  A TCP riding on IPv6 may
>receive old segments an unbounded time later without any other
>network element breaking a spec.

for the record, while IPv4 TTL remains theoretically a time in seconds, it 
effectively became a hop count a long time ago. Thus sayeth RFC 1812:

5.3.1 Time to Live (TTL)

    The Time-to-Live (TTL) field of the IP header is defined to be a
    timer limiting the lifetime of a datagram.  It is an 8-bit field and
    the units are seconds.  Each router (or other module) that handles a
    packet MUST decrement the TTL by at least one, even if the elapsed
    time was much less than a second.  Since this is very often the case,
    the TTL is effectively a hop count limit on how far a datagram can
    propagate through the Internet.

    When a router forwards a packet, it MUST reduce the TTL by at least
    one.  If it holds a packet for more than one second, it MAY decrement
    the TTL by one for each second.

In that it "MAY" decrement the value, it also may choose not to...



From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 20:36:40 2002
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Date: Fri, 05 Apr 2002 17:29:19 -0800
From: Joe Touch <touch@ISI.EDU>
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To: der Mouse <mouse@Rodents.Montreal.QC.CA>
Cc: tcp-impl@grc.nasa.gov
Subject: Re: TCP Checksum Interoperability
References: <200204052209.RAA13008@ginger.lcs.mit.edu> <200204060021.TAA24631@Sparkle.Rodents.Montreal.QC.CA>
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der Mouse wrote:
>>The TCP (and IP) checksum is defined as "the one's complement of the
>>one's-complement sum of the packet contents" [...]
> 
> 
>>(The only way to get all 0's as a sum of a one's-complement addition
>>process is to to sum a series of zero's - which a real packet will
>>never contain.)
>
> ...huh?  It depends on how you implement one's-complement arithmetic.

See RFC1624. The definition of 1's complement arithmetic is not 
implementation dependent.

> Consider, for example, "do two's-complement adds and reduce the result
> mod 0xffff", which may be suitable on a machine with fast hardware mod,
> and which can never produce 0xffff.
> 
> In 16-bit one's-complement arithmetic, 0x0000 and 0xffff are
> equivalent, not only on input but also on output.  Trying to draw an
> artificial distinction between them is not only unsupported by the
> standard as far as I can tell but liable to break interoperability with
> conformant implementations which don't draw that distinction.

That issue is covered in RFC1624 and in RFC768.

>>Note that if the packet's check sum (i.e. the sum with the checksum
>>field set to zero) happens to come out to zero (i.e. all one's,
>>before the complement), then *either* value of zero in the checksum
>>field of the packet will result in an all-1's sum when the packet is
>>checksummed.
>
> ...unless the packet checksumming is done in a way that generates
> 0x0000 instead of 0xffff when the sum is (one's-complement) zero.

Again, see RFC1624.

>>I honestly don't understand why anyone's code even bothers to look at
>>the actual value in the checksum field of the incoming packet; just
>>do the checksum of the whole packet, and look at the result.

Because there's a difference - see RFC768.

Joe




From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 22:11:52 2002
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From: der Mouse <mouse@Rodents.Montreal.QC.CA>
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To: tcp-impl@grc.nasa.gov
Subject: Re: TCP Checksum Interoperability
In-Reply-To: <3CAE4F6F.3090701@isi.edu>
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>> ...huh?  It depends on how you implement one's-complement arithmetic.
> See RFC1624.

I believe 1624 is wrong, because it makes exactly the same mistake
you're making here.  What's more, to quote from it, "This memo does not
specify an Internet standard of any kind".

> The definition of 1's complement arithmetic is not implementation
> dependent.

True as far as it goes.  But in abstract one's-complement binary
arithmetic, all-0-bits and all-1-bits are completely equivalent, both
on input and on output; an implementation may produce either, at whim,
for zero results, and still be computing with one's-complement
arithmetic.

_That_ arithmetic is the one that is "not implementation dependent".  I
believe that's the arithmetic 793 specifies - and in that arithmetic,
the difference between all-0-bits and all-1-bits is a matter of two
completely equivalent representations of a single semantic value;
either may be generated for a zero result, according to convenience of
implementation, the parity of the cycle counter, or whether the CPU
happens to be mounted vertically.

>> Trying to draw an artificial distinction between them is not only
>> unsupported by the standard as far as I can tell but liable to break
>> interoperability with conformant implementations which don't draw
>> that distinction.
> That issue is covered in RFC1624 and in RFC768.

1624, aside from being all about *incremental* computation, is, I
believe, simply wrong; the arithmetic it describes - wherein all-0-bits
and all-1-bits are different - is not one's-complement arithmetic.

768 is irrelevant, since we're discussing TCP, and also because it
specifically goes to the trouble of specifying one of the two otherwise
equivalent representations of zero - it standardizes, for purposes of
UDP, a semantic difference somewhat akin to the one you're trying to
read into 793, which I believe just isn't there.  That is, 768 is
describing not one's-complement arithmetic but a specifically and
narrowly tailored extension of one's-complement arithmetic.

/~\ The ASCII				der Mouse
\ / Ribbon Campaign
 X  Against HTML	       mouse@rodents.montreal.qc.ca
/ \ Email!	     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B


From owner-tcp-impl@grc.nasa.gov  Mon Apr  8 10:43:21 2002
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From: Chris Trobridge <CTrobridge@baltimore.com>
To: Lloyd Wood <L.Wood@eim.surrey.ac.uk>,
        Michael Smith <msmith@corp.iready.com>
Cc: "'CTrobridge@baltimore.com'" <CTrobridge@baltimore.com>,
        "'sra+ietf@hactrn.net'" <sra+ietf@hactrn.net>,
        "'ietf@IETF.ORG'" <ietf@ietf.org>,
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Subject: RE: TCP Checksum Interoperability
Date: Mon, 8 Apr 2002 15:30:18 +0100 
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FYI, The 'offending' stacks are PC/TCP (reception) and in Open VMS
(transmission).

This is an age-old issue; the following dates from 1985(!):

http://www-mice.cs.ucl.ac.uk/multimedia/misc/tcp_ip/8502.mm.www/0389.html

I think RFC 1624 is missing the UDP case, where +0 means "not calculated".
Indeed, RFC 768 asserts that the two values (+0 and -0) are equivalent.

Part of the problem is that there isn't an RFC standard that deals with the
issue of a zero checksum, apart from for UDP.

The protocol RFCs don't specify the details and the implementation RFCs
(1071, 1141, 1624) state explicitly that they are not standards, "It is not
a standard, but a set of useful implementation techniques".

They are a very good idea but not mandatory.

That's why I said I thought the receiver wasn't compliant: it rejects -0 as
invalid.

Chris

> -----Original Message-----
> From: Lloyd Wood [mailto:l.wood@eim.surrey.ac.uk]
> Sent: 05 April 2002 21:45
> To: Michael Smith
> Cc: 'CTrobridge@baltimore.com'; 'sra+ietf@hactrn.net'; 
> 'ietf@IETF.ORG';
> 'tcp-impl@grc.nasa.gov'
> Subject: RE: TCP Checksum Interoperability
> 
> 
> On Fri, 5 Apr 2002, Michael Smith wrote:
> 
> > The last time this came up for a TCP implementation I used to
> > maintain, our interpretation of Robustness Principle applied to this
> > problem dictated that we shouldn't send segments with 
> checksum fields
> > set to all ones (that is, we shouldn't send ~(+0)), but 
> that we had to
> > accept either ~(+0) or ~(-0) in received segments.
> >
> > Strictly speaking, either zero state is completely legal
> 
> Not so. Please read RFC1624 sections 3-5.
> 
> L.
> 
> <L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>
> 
> 


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From owner-tcp-impl@grc.nasa.gov  Mon Apr  8 12:24:01 2002
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From: Bob Braden <braden@ISI.EDU>
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I am sure most people on this list already know this, but maybe it
is worth reviewing.

The story of IP TTL is a tussle between theory and practice.  The
theory says that, in order to create a reliable transport protocol
(i.e., TCP (or, I suppose, SCTP)), you have to be able to absolutely
bound the lifetime of a segment within the network.  The definition of
TTL as time-in-seconds-but-always-decremented-by-1 was crafted (by
Jon Postel) to maintain this lifetime bound while also functioning as a
hop count limit.  The pragmatic world refused to implement it that
way.  This may leave you wondering why TCPs still works.  Presumably,
from the theory viewpoint it doesn't work; somewhere, sometime, in the
Internet an old duplicate packet screws up a connection, and (even more
rarely) happens to create a error in the received data.  In practice,
packets are very, very seldom delayed long enough for this to happen,
so it (mostly) works.

Bob Braden


From owner-tcp-impl@grc.nasa.gov  Mon Apr  8 12:48:52 2002
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I have filed this conversation away in my "cksum" folder.  The
previous messages in the folder are from 1988-1990 (I surely
must have missed some in between!).  For those with a nostalgic
bent, the earlier messages were sent to the tcp-ip mailing list.

Bob Braden


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Date: Mon, 08 Apr 2002 14:38:06 -0700
From: Murali Bashyam <mbashyam@cisco.com>
Organization: Cisco Systems Inc
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Murali Bashyam wrote:

> Hi
>
> In SYN_RECEIVED state after sending a SYN-ACK to the peer, when TCP
> receives a unacceptable ACK
> i.e the ACK lies outside the receive window, it is supposed to drop the
> incoming ACK and respond with a pure ACK as it should for any packet
> that is completely outside the receive window. This is reqd as per RFC
> 793.
>
> In BSD TCP code (FREEBSD/NETBSD) i notice that in SYN-RECEIVED state any
>
> outgoing segment generated would carry the SYN bit as well as the ACK
> bit set. So BSD code, when it responds with a ACK in the above scenario
> also has the SYN bit set. Is this acceptable behaviour? Linux responds
> with a pure ACK in this scenario.
>
> Murali



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Message-Id: <200204082145.VAA04951@gra.isi.edu>
To: tcp-impl@grc.nasa.gov, mbashyam@cisco.com
Subject: Re: Unacceptable ACK in SYN_RCVD state handling
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  *> From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 11:22:21 2002
  *> Date: Fri, 05 Apr 2002 11:14:22 -0800
  *> From: Murali Bashyam <mbashyam@cisco.com>
  *> X-Accept-Language: en
  *> MIME-Version: 1.0
  *> To: tcp-impl@grc.nasa.gov
  *> Subject: Unacceptable ACK in SYN_RCVD state handling
  *> Content-Transfer-Encoding: 7bit
  *> X-AntiVirus: scanned by AMaViS 0.2.1
  *> 
  *> Hi
  *> 
  *> In SYN_RECEIVED state after sending a SYN-ACK to the peer, when TCP
  *> receives a unacceptable ACK
  *> i.e the ACK lies outside the receive window, it is supposed to drop the
  *> incoming ACK and respond with a pure ACK as it should for any packet
  *> that is completely outside the receive window. This is reqd as per RFC
  *> 793.
  *> 
  *> In BSD TCP code (FREEBSD/NETBSD) i notice that in SYN-RECEIVED state any
  *> 
  *> outgoing segment generated would carry the SYN bit as well as the ACK
  *> bit set. So BSD code, when it responds with a ACK in the above scenario
  *> also has the SYN bit set. Is this acceptable behaviour? Linux responds
  *> with a pure ACK in this scenario.
  *> 
  *> Murali
  *> 
  *> 
  *> 

Hmmm.  I was about to say that:

	The TCP has sent a SYN,ACK and its SYN has not been acknowledged.  It
	is still in SYN RECEIVED state, so retransmitting the SYN seems to me
	to be acceptable behavior in this situation.

But glancing at RFC 793, it appears that it says to send a RST segment
at that point (ACK bit on and unacceptable ACK in SYN RECEIVED state,
page 72 of RFC 793.)

Bob Braden



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From: Murali Bashyam <mbashyam@cisco.com>
Organization: Cisco Systems Inc
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Bob Braden wrote:

>   *> From owner-tcp-impl@grc.nasa.gov  Fri Apr  5 11:22:21 2002
>   *> Date: Fri, 05 Apr 2002 11:14:22 -0800
>   *> From: Murali Bashyam <mbashyam@cisco.com>
>   *> X-Accept-Language: en
>   *> MIME-Version: 1.0
>   *> To: tcp-impl@grc.nasa.gov
>   *> Subject: Unacceptable ACK in SYN_RCVD state handling
>   *> Content-Transfer-Encoding: 7bit
>   *> X-AntiVirus: scanned by AMaViS 0.2.1
>   *>
>   *> Hi
>   *>
>   *> In SYN_RECEIVED state after sending a SYN-ACK to the peer, when TCP
>   *> receives a unacceptable ACK
>   *> i.e the ACK lies outside the receive window, it is supposed to drop the
>   *> incoming ACK and respond with a pure ACK as it should for any packet
>   *> that is completely outside the receive window. This is reqd as per RFC
>   *> 793.
>   *>
>   *> In BSD TCP code (FREEBSD/NETBSD) i notice that in SYN-RECEIVED state any
>   *>
>   *> outgoing segment generated would carry the SYN bit as well as the ACK
>   *> bit set. So BSD code, when it responds with a ACK in the above scenario
>   *> also has the SYN bit set. Is this acceptable behaviour? Linux responds
>   *> with a pure ACK in this scenario.
>   *>
>   *> Murali
>   *>
>   *>
>   *>
>
> Hmmm.  I was about to say that:
>
>         The TCP has sent a SYN,ACK and its SYN has not been acknowledged.  It
>         is still in SYN RECEIVED state, so retransmitting the SYN seems to me
>         to be acceptable behavior in this situation.

>
>
> But glancing at RFC 793, it appears that it says to send a RST segment
> at that point (ACK bit on and unacceptable ACK in SYN RECEIVED state,
> page 72 of RFC 793.)

No, the scenario that applies is described on page 68 (sequence number check),
in this
case the ACK carries a sequence number that lies outside the receive window and
hence
the action recommended on page 68 is the following

        If an incoming segment is not acceptable, an acknowledgment
        should be sent in reply (unless the RST bit is set, if so drop
        the segment and return):

          <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>

        After sending the acknowledgment, drop the unacceptable segment
        and return.

The point u mentioned above is the conflict i am having as well, it seems to me
that retransmitting
a SYN-ACK seems the right thing to do. But the BSD stack doesn't seem to be
doing that.

Murali




>
>
> Bob Braden



From owner-tcp-impl@grc.nasa.gov  Mon Apr  8 18:18:51 2002
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  *> 
  *> No, the scenario that applies is described on page 68 (sequence number check),

Yes, sorry, I misinterpreted what you were asking (ACK field as opposed
to sequence field of ACK segment (But the man DID say "receive window"...
mumble).

  *> 
  *> The point u mentioned above is the conflict i am having as well, it seems to me
  *> that retransmitting
  *> a SYN-ACK seems the right thing to do. But the BSD stack doesn't seem to be
  *> doing that.

I thought you said earlier that the BSD DOES retransmit the SYN.  In
any case, I would agree that the text of RFC 793 seems to say
otherwise.  This particular test is one that has caused a great deal of
confusion over the years.  From the underlying logic of TCP,  I believe
that retransmitting the SYN is OK.  So it seems you can choose either
interpretation you want (unless there is some  subtle security
implication.)

Bob Braden

  *> 
  *> Murali
  *> 
  *> 
  *> 
  *> 
  *> >
  *> >
  *> > Bob Braden
  *> 


From owner-tcp-impl@grc.nasa.gov  Mon Apr  8 19:00:19 2002
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Bob Braden wrote:

>   *>
>   *> No, the scenario that applies is described on page 68 (sequence number check),
>
> Yes, sorry, I misinterpreted what you were asking (ACK field as opposed
> to sequence field of ACK segment (But the man DID say "receive window"...
> mumble).
>
>   *>
>   *> The point u mentioned above is the conflict i am having as well, it seems to me
>   *> that retransmitting
>   *> a SYN-ACK seems the right thing to do. But the BSD stack doesn't seem to be
>   *> doing that.
>
> I thought you said earlier that the BSD DOES retransmit the SYN.  In

Sorry, the BSD stack does retransmit the SYN. Linux sends a pure ACK in response.

Murali

>
> any case, I would agree that the text of RFC 793 seems to say
> otherwise.  This particular test is one that has caused a great deal of
> confusion over the years.  From the underlying logic of TCP,  I believe
> that retransmitting the SYN is OK.  So it seems you can choose either
> interpretation you want (unless there is some  subtle security
> implication.)

>
> Bob Braden
>
>   *>
>   *> Murali
>   *>
>   *>
>   *>
>   *>
>   *> >
>   *> >
>   *> > Bob Braden
>   *>



From owner-tcp-impl@grc.nasa.gov  Mon Apr  8 19:13:43 2002
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To: "'Bob Braden'" <braden@ISI.EDU>, mbashyam@cisco.com
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I'm confused.  The stuff on page 68 (69?) seems to contradict the following
from page 36, under the Reset Generation heading, at least for SYN-RECEIVED:

    2.  If the connection is in any non-synchronized state (LISTEN,
    SYN-SENT, SYN-RECEIVED), and the incoming segment acknowledges
    something not yet sent (the segment carries an unacceptable ACK), or
    if an incoming segment has a security level or compartment which
    does not exactly match the level and compartment requested for the
    connection, a reset is sent.

Page 68/69 appears to count SYN-RECEIVED as a synchronized state.

-----Original Message-----
From: Bob Braden [mailto:braden@ISI.EDU]
Sent: Monday, April 08, 2002 12:14 PM
To: braden@ISI.EDU; mbashyam@cisco.com
Cc: tcp-impl@grc.nasa.gov
Subject: Re: Unacceptable ACK in SYN_RCVD state handling


  *> 
  *> No, the scenario that applies is described on page 68 (sequence number
check),

Yes, sorry, I misinterpreted what you were asking (ACK field as opposed
to sequence field of ACK segment (But the man DID say "receive window"...
mumble).

  *> 
  *> The point u mentioned above is the conflict i am having as well, it
seems to me
  *> that retransmitting
  *> a SYN-ACK seems the right thing to do. But the BSD stack doesn't seem
to be
  *> doing that.

I thought you said earlier that the BSD DOES retransmit the SYN.  In
any case, I would agree that the text of RFC 793 seems to say
otherwise.  This particular test is one that has caused a great deal of
confusion over the years.  From the underlying logic of TCP,  I believe
that retransmitting the SYN is OK.  So it seems you can choose either
interpretation you want (unless there is some  subtle security
implication.)

Bob Braden

  *> 
  *> Murali
  *> 
  *> 
  *> 
  *> 
  *> >
  *> >
  *> > Bob Braden
  *> 

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	charset="iso-8859-1"
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<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
charset=3Diso-8859-1">
<META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
5.5.2653.12">
<TITLE>RE: Unacceptable ACK in SYN_RCVD state handling</TITLE>
</HEAD>
<BODY>

<P><FONT SIZE=3D2>I'm confused.&nbsp; The stuff on page 68 (69?) seems =
to contradict the following from page 36, under the Reset Generation =
heading, at least for SYN-RECEIVED:</FONT></P>

<P><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; 2.&nbsp; If the connection is in =
any non-synchronized state (LISTEN,</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; SYN-SENT, SYN-RECEIVED), and the =
incoming segment acknowledges</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; something not yet sent (the =
segment carries an unacceptable ACK), or</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; if an incoming segment has a =
security level or compartment which</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; does not exactly match the level =
and compartment requested for the</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; connection, a reset is =
sent.</FONT>
</P>

<P><FONT SIZE=3D2>Page 68/69 appears to count SYN-RECEIVED as a =
synchronized state.</FONT>
</P>

<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Bob Braden [<A =
HREF=3D"mailto:braden@ISI.EDU">mailto:braden@ISI.EDU</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Monday, April 08, 2002 12:14 PM</FONT>
<BR><FONT SIZE=3D2>To: braden@ISI.EDU; mbashyam@cisco.com</FONT>
<BR><FONT SIZE=3D2>Cc: tcp-impl@grc.nasa.gov</FONT>
<BR><FONT SIZE=3D2>Subject: Re: Unacceptable ACK in SYN_RCVD state =
handling</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>&nbsp; *&gt; </FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; No, the scenario that applies is =
described on page 68 (sequence number check),</FONT>
</P>

<P><FONT SIZE=3D2>Yes, sorry, I misinterpreted what you were asking =
(ACK field as opposed</FONT>
<BR><FONT SIZE=3D2>to sequence field of ACK segment (But the man DID =
say &quot;receive window&quot;...</FONT>
<BR><FONT SIZE=3D2>mumble).</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp; *&gt; </FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; The point u mentioned above is the =
conflict i am having as well, it seems to me</FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; that retransmitting</FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; a SYN-ACK seems the right thing to do. =
But the BSD stack doesn't seem to be</FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; doing that.</FONT>
</P>

<P><FONT SIZE=3D2>I thought you said earlier that the BSD DOES =
retransmit the SYN.&nbsp; In</FONT>
<BR><FONT SIZE=3D2>any case, I would agree that the text of RFC 793 =
seems to say</FONT>
<BR><FONT SIZE=3D2>otherwise.&nbsp; This particular test is one that =
has caused a great deal of</FONT>
<BR><FONT SIZE=3D2>confusion over the years.&nbsp; From the underlying =
logic of TCP,&nbsp; I believe</FONT>
<BR><FONT SIZE=3D2>that retransmitting the SYN is OK.&nbsp; So it seems =
you can choose either</FONT>
<BR><FONT SIZE=3D2>interpretation you want (unless there is some&nbsp; =
subtle security</FONT>
<BR><FONT SIZE=3D2>implication.)</FONT>
</P>

<P><FONT SIZE=3D2>Bob Braden</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp; *&gt; </FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; Murali</FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; </FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; </FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; </FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; </FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; &gt;</FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; &gt; Bob Braden</FONT>
<BR><FONT SIZE=3D2>&nbsp; *&gt; </FONT>
</P>

</BODY>
</HTML>
------_=_NextPart_001_01C1DF51.FF1D7470--


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Message-ID: <3CB226F4.F05F97D4@cisco.com>
Date: Mon, 08 Apr 2002 16:25:40 -0700
From: Murali Bashyam <mbashyam@cisco.com>
Organization: Cisco Systems Inc
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To: Robin Uyeshiro <ruyeshiro@iready.com>
Cc: "'Bob Braden'" <braden@ISI.EDU>, tcp-impl@grc.nasa.gov
Subject: Re: Unacceptable ACK in SYN_RCVD state handling
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Robin Uyeshiro wrote:

>
>
> I'm confused.  The stuff on page 68 (69?) seems to contradict the
> following from page 36, under the Reset Generation heading, at least
> for SYN-RECEIVED:
>
>     2.  If the connection is in any non-synchronized state (LISTEN,
>     SYN-SENT, SYN-RECEIVED), and the incoming segment acknowledges
>     something not yet sent (the segment carries an unacceptable ACK),
> or
>     if an incoming segment has a security level or compartment which
>     does not exactly match the level and compartment requested for the
>
>     connection, a reset is sent.

This is when the incoming ACK is unacceptable because the ack number is
greater than snd_una,
the scenario under consideration has to the seq number of the ACK being
greater than (rcv_nxt + rcv_win)
i.e the incoming ACK lies complete outside the receive window.

Murali

>
>
> Page 68/69 appears to count SYN-RECEIVED as a synchronized state.
>
> -----Original Message-----
> From: Bob Braden [mailto:braden@ISI.EDU]
> Sent: Monday, April 08, 2002 12:14 PM
> To: braden@ISI.EDU; mbashyam@cisco.com
> Cc: tcp-impl@grc.nasa.gov
> Subject: Re: Unacceptable ACK in SYN_RCVD state handling
>
>   *>
>   *> No, the scenario that applies is described on page 68 (sequence
> number check),
>
> Yes, sorry, I misinterpreted what you were asking (ACK field as
> opposed
> to sequence field of ACK segment (But the man DID say "receive
> window"...
> mumble).
>
>   *>
>   *> The point u mentioned above is the conflict i am having as well,
> it seems to me
>   *> that retransmitting
>   *> a SYN-ACK seems the right thing to do. But the BSD stack doesn't
> seem to be
>   *> doing that.
>
> I thought you said earlier that the BSD DOES retransmit the SYN.  In
> any case, I would agree that the text of RFC 793 seems to say
> otherwise.  This particular test is one that has caused a great deal
> of
> confusion over the years.  From the underlying logic of TCP,  I
> believe
> that retransmitting the SYN is OK.  So it seems you can choose either
> interpretation you want (unless there is some  subtle security
> implication.)
>
> Bob Braden
>
>   *>
>   *> Murali
>   *>
>   *>
>   *>
>   *>
>   *> >
>   *> >
>   *> > Bob Braden
>   *>

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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
Robin Uyeshiro wrote:
<blockquote TYPE=CITE>&nbsp;
<p><font size=-1>I'm confused.&nbsp; The stuff on page 68 (69?) seems to
contradict the following from page 36, under the Reset Generation heading,
at least for SYN-RECEIVED:</font>
<p><font size=-1>&nbsp;&nbsp;&nbsp; 2.&nbsp; If the connection is in any
non-synchronized state (LISTEN,</font>
<br><font size=-1>&nbsp;&nbsp;&nbsp; SYN-SENT, SYN-RECEIVED), and the incoming
segment acknowledges</font>
<br><font size=-1>&nbsp;&nbsp;&nbsp; something not yet sent (the segment
carries an unacceptable ACK), or</font>
<br><font size=-1>&nbsp;&nbsp;&nbsp; if an incoming segment has a security
level or compartment which</font>
<br><font size=-1>&nbsp;&nbsp;&nbsp; does not exactly match the level and
compartment requested for the</font>
<br><font size=-1>&nbsp;&nbsp;&nbsp; connection, a reset is sent.</font></blockquote>

<p><br>This is when the incoming ACK is unacceptable because the ack number
is greater than snd_una,
<br>the scenario under consideration has to the seq number of the ACK being
greater than (rcv_nxt + rcv_win)
<br>i.e the incoming ACK lies complete outside the receive window.
<p>Murali
<blockquote TYPE=CITE><font size=-1></font>&nbsp;
<p><font size=-1>Page 68/69 appears to count SYN-RECEIVED as a synchronized
state.</font>
<p><font size=-1>-----Original Message-----</font>
<br><font size=-1>From: Bob Braden [<a href="mailto:braden@ISI.EDU">mailto:braden@ISI.EDU</a>]</font>
<br><font size=-1>Sent: Monday, April 08, 2002 12:14 PM</font>
<br><font size=-1>To: braden@ISI.EDU; mbashyam@cisco.com</font>
<br><font size=-1>Cc: tcp-impl@grc.nasa.gov</font>
<br><font size=-1>Subject: Re: Unacceptable ACK in SYN_RCVD state handling</font>
<p><font size=-1>&nbsp; *></font>
<br><font size=-1>&nbsp; *> No, the scenario that applies is described
on page 68 (sequence number check),</font>
<p><font size=-1>Yes, sorry, I misinterpreted what you were asking (ACK
field as opposed</font>
<br><font size=-1>to sequence field of ACK segment (But the man DID say
"receive window"...</font>
<br><font size=-1>mumble).</font>
<p><font size=-1>&nbsp; *></font>
<br><font size=-1>&nbsp; *> The point u mentioned above is the conflict
i am having as well, it seems to me</font>
<br><font size=-1>&nbsp; *> that retransmitting</font>
<br><font size=-1>&nbsp; *> a SYN-ACK seems the right thing to do. But
the BSD stack doesn't seem to be</font>
<br><font size=-1>&nbsp; *> doing that.</font>
<p><font size=-1>I thought you said earlier that the BSD DOES retransmit
the SYN.&nbsp; In</font>
<br><font size=-1>any case, I would agree that the text of RFC 793 seems
to say</font>
<br><font size=-1>otherwise.&nbsp; This particular test is one that has
caused a great deal of</font>
<br><font size=-1>confusion over the years.&nbsp; From the underlying logic
of TCP,&nbsp; I believe</font>
<br><font size=-1>that retransmitting the SYN is OK.&nbsp; So it seems
you can choose either</font>
<br><font size=-1>interpretation you want (unless there is some&nbsp; subtle
security</font>
<br><font size=-1>implication.)</font>
<p><font size=-1>Bob Braden</font>
<p><font size=-1>&nbsp; *></font>
<br><font size=-1>&nbsp; *> Murali</font>
<br><font size=-1>&nbsp; *></font>
<br><font size=-1>&nbsp; *></font>
<br><font size=-1>&nbsp; *></font>
<br><font size=-1>&nbsp; *></font>
<br><font size=-1>&nbsp; *> ></font>
<br><font size=-1>&nbsp; *> ></font>
<br><font size=-1>&nbsp; *> > Bob Braden</font>
<br><font size=-1>&nbsp; *></font></blockquote>
</html>

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From owner-tcp-impl@grc.nasa.gov  Tue Apr  9 00:52:15 2002
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Date: Tue, 09 Apr 2002 10:09:47 +0530
From: Arun Prasad <arun@netlab.hcltech.com>
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To: tsvwg <tsvwg@ietf.org>
Cc: tcp-impl@grc.nasa.gov, sctp <sctpimp@netlab.hcltech.com>
Subject: ECN & PMTU
References: <3CADF78E.D9E24D26@cisco.com> <3CB20DBE.3B687309@cisco.com>
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Hi all,
    Some doubts on the procedure followed for PMTU (Path mtu) discovery and
ECN method.....
    The doubt is not related to the procedure as such, but the relation between the
two procedures stated above......
Tcp and Sctp uses ICMP message to handle the PMTU discovery procedure....
ie., the intermediate router will send an ICMP messge of "Message too Long"
to the end point sending the data packet of size greater than the MTU size of some
intermediate path to the destination.....

For ECN, the intermediate router should set the appropriate bits in the IP header
(if it supports ECN ....) whenever there is congestion and risk of packet drops
is high....... The endpoints then correct their Congestion window accordingly and
help in reducing the Congestion in the intermediate router.....

Why, we adopt two different methods to carry out similar (in the sense, both are
related to the Intermediate routers....)?????
    Why cant we generalise this stuff.... ie.,  the need here is some way to
communicate between the intermediate router and the endpoint.... Not sure
which of the two ways is advantageous, but cant we use the same method for
both..... ie.,
As for the PMTU discovery, the intermediate router can send an ICMP message
to the endpoint carrying a message "CONGESTION", by receiving this the
endpoint will do all appropriate actions as it does when it receives the packet set
with ECN-ECHO flag (as in present ECN procedure...)

or vice versa ( ie., adopt the method followed by ECN  for PMTU discovery aslo,
that might be slighly tough, considering the Backward compatibility....)

    What we can achieve by this is the simplicity  in the router implementation,
which doesnt need to do different procedure for different features of the Transport
layer..... and by maintaining this uniformity, the future extentions which demands a
similar requirement can use the same way......

I could have missed some points....

Any comments on this????


Thanks
-arun
--
****************************************************************
V.Arun Prasad
HCL Technologies Ltd.
51, Jawaharlal Nehru Road,
Ekkattuthangal,
Guindy Industrial Estate,
Chennai - 600097.

Contact # : 9144 - 2334174
            9144 - 2334181
            extn : 233
****************************************************************




From owner-tcp-impl@grc.nasa.gov  Tue Apr  9 02:19:33 2002
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 Alameda
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Subject: Re: [Tsvwg] ECN & PMTU
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One reason: sending extra packets in the face
of congestion will worsen the congestion.
Congestion collapse could be a very serious possible
consequence of sending extra packets.
Notice the ECN does not go towards the sender,
but in the other direction. I think the intention
is to have the upper layer (transport) in the
receiver withhold acknowledgements to cause the
sender to back off. I'm making this up, so please
correct me if I'm wrong.

PMTU discovery does not face this problem. It's ok to send
an extra packet back to the sender in this case.

Arun Prasad wrote:
> 
> Hi all,
>     Some doubts on the procedure followed for PMTU (Path mtu) discovery and
> ECN method.....
>     The doubt is not related to the procedure as such, but the relation between the
> two procedures stated above......
> Tcp and Sctp uses ICMP message to handle the PMTU discovery procedure....
> ie., the intermediate router will send an ICMP messge of "Message too Long"
> to the end point sending the data packet of size greater than the MTU size of some
> intermediate path to the destination.....
> 
> For ECN, the intermediate router should set the appropriate bits in the IP header
> (if it supports ECN ....) whenever there is congestion and risk of packet drops
> is high....... The endpoints then correct their Congestion window accordingly and
> help in reducing the Congestion in the intermediate router.....
> 
> Why, we adopt two different methods to carry out similar (in the sense, both are
> related to the Intermediate routers....)?????
>     Why cant we generalise this stuff.... ie.,  the need here is some way to
> communicate between the intermediate router and the endpoint.... Not sure
> which of the two ways is advantageous, but cant we use the same method for
> both..... ie.,
> As for the PMTU discovery, the intermediate router can send an ICMP message
> to the endpoint carrying a message "CONGESTION", by receiving this the
> endpoint will do all appropriate actions as it does when it receives the packet set
> with ECN-ECHO flag (as in present ECN procedure...)
> 
> or vice versa ( ie., adopt the method followed by ECN  for PMTU discovery aslo,
> that might be slighly tough, considering the Backward compatibility....)
> 
>     What we can achieve by this is the simplicity  in the router implementation,
> which doesnt need to do different procedure for different features of the Transport
> layer..... and by maintaining this uniformity, the future extentions which demands a
> similar requirement can use the same way......
> 
> I could have missed some points....
> 
> Any comments on this????
> 
> Thanks
> -arun
> --
> ****************************************************************
> V.Arun Prasad
> HCL Technologies Ltd.
> 51, Jawaharlal Nehru Road,
> Ekkattuthangal,
> Guindy Industrial Estate,
> Chennai - 600097.
> 
> Contact # : 9144 - 2334174
>             9144 - 2334181
>             extn : 233
> ****************************************************************
> 
> _______________________________________________
> tsvwg mailing list
> tsvwg@ietf.org
> https://www1.ietf.org/mailman/listinfo/tsvwg

-- 
// Jacob Heitz. Tel:510-747-2917


From owner-tcp-impl@grc.nasa.gov  Tue Apr  9 05:11:12 2002
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To: Jacob Heitz <jheitz@lucent.com>
Cc: Arun Prasad <arun@netlab.hcltech.com>, tsvwg <tsvwg@ietf.org>,
        tcp-impl@grc.nasa.gov, sctp <sctpimp@netlab.hcltech.com>
From: "La Monte Henry Piggy Yarroll" <piggy@baqaqi.chi.il.us>
Subject: Re: [Tsvwg] ECN & PMTU 
In-reply-to: Your message of Mon, 08 Apr 2002 23:09:56 -0700.
             <3CB285B4.9E8FBBA4@lucent.com> 
Date: Tue, 09 Apr 2002 04:01:26 -0500
Sender: owner-tcp-impl@grc.nasa.gov
Precedence: bulk

Jacob's comments are roughly correct.  Bits in the IP header are very
precious so we expend them only for a REALLY good reason, e.g. ECN.

Jacob Heitz <jheitz@lucent.com> writes:
> One reason: sending extra packets in the face
> of congestion will worsen the congestion.
> Congestion collapse could be a very serious possible
> consequence of sending extra packets.
> Notice the ECN does not go towards the sender,
> but in the other direction. I think the intention
> is to have the upper layer (transport) in the
> receiver withhold acknowledgements to cause the
> sender to back off. I'm making this up, so please
> correct me if I'm wrong.

You are correct that the transport layer is supposed to handle the
Congestion Experienced (CE) bits in the IP header.  In the case of
both SCTP and TCP the reaction is to include a transport-specific
congestion notification in the next ACK.  This allows the sending side
to back off just like normal congestion detection, but without losing
a packet.

> PMTU discovery does not face this problem. It's ok to send
> an extra packet back to the sender in this case.

I.e. there is no need to spend IP header bits on this function.

> Arun Prasad wrote:
> > 
> > Hi all,
> >     Some doubts on the procedure followed for PMTU (Path mtu) discovery and
> > ECN method.....
> >     The doubt is not related to the procedure as such, but the relation bet
ween the
> > two procedures stated above......
> > Tcp and Sctp uses ICMP message to handle the PMTU discovery procedure....
> > ie., the intermediate router will send an ICMP messge of "Message too Long"
> > to the end point sending the data packet of size greater than the MTU size 
of some
> > intermediate path to the destination.....
> > 
> > For ECN, the intermediate router should set the appropriate bits in the IP 
header
> > (if it supports ECN ....) whenever there is congestion and risk of packet d
rops
> > is high....... The endpoints then correct their Congestion window according
ly and
> > help in reducing the Congestion in the intermediate router.....
> > 
> > Why, we adopt two different methods to carry out similar (in the sense, bot
h are
> > related to the Intermediate routers....)?????
> >     Why cant we generalise this stuff.... ie.,  the need here is some way t
o
> > communicate between the intermediate router and the endpoint.... Not sure
> > which of the two ways is advantageous, but cant we use the same method for
> > both..... ie.,
> > As for the PMTU discovery, the intermediate router can send an ICMP message
> > to the endpoint carrying a message "CONGESTION", by receiving this the
> > endpoint will do all appropriate actions as it does when it receives the pa
cket set
> > with ECN-ECHO flag (as in present ECN procedure...)
> > 
> > or vice versa ( ie., adopt the method followed by ECN  for PMTU discovery a
slo,
> > that might be slighly tough, considering the Backward compatibility....)
> > 
> >     What we can achieve by this is the simplicity  in the router implementa
tion,
> > which doesnt need to do different procedure for different features of the T
ransport
> > layer..... and by maintaining this uniformity, the future extentions which 
demands a
> > similar requirement can use the same way......
> > 
> > I could have missed some points....
> > 
> > Any comments on this????
> > 
> > Thanks
> > -arun
> > --
> > ****************************************************************
> > V.Arun Prasad
> > HCL Technologies Ltd.
> > 51, Jawaharlal Nehru Road,
> > Ekkattuthangal,
> > Guindy Industrial Estate,
> > Chennai - 600097.
> > 
> > Contact # : 9144 - 2334174
> >             9144 - 2334181
> >             extn : 233
> > ****************************************************************
> > 
> > _______________________________________________
> > tsvwg mailing list
> > tsvwg@ietf.org
> > https://www1.ietf.org/mailman/listinfo/tsvwg
> 
> -- 
> // Jacob Heitz. Tel:510-747-2917
> 
> _______________________________________________
> tsvwg mailing list
> tsvwg@ietf.org
> https://www1.ietf.org/mailman/listinfo/tsvwg


From owner-tcp-impl@grc.nasa.gov  Tue Apr  9 06:05:38 2002
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        sctp <sctpimp@netlab.hcltech.com>
Subject: Re: [Tsvwg] ECN & PMTU
References: <3CADF78E.D9E24D26@cisco.com> <3CB20DBE.3B687309@cisco.com> <3CB27092.7680BC16@netlab.hcltech.com> <3CB285B4.9E8FBBA4@lucent.com>
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hi jacob,

Jacob Heitz wrote:

> One reason: sending extra packets in the face
> of congestion will worsen the congestion.
> Congestion collapse could be a very serious possible
> consequence of sending extra packets.

         I couldnt get the point of, sending extra packets during congestion.....
Say if a Router decides that there will be congestion ( its not in congestion now...)
then it decides to set the ECN bit in the IP header of certain packets in the Queue...
These packets should reach the receiver endpoint.... then the receiver will
send a ACK to the sender to indicate there is a congestion..... Doesnt this too
long a process.... ie., anyway a SACK is to be sent from the Receiver to the
sender....  In that case why not an ICMP packet from the router to the sender???

And also, since the extra packets are going to flow in the opposite direction
of the actual congestion, I couldnt see any harm .... (I know this might be a
wrong statemnent.... but I dont have the right justification...)

Atleast in Source Quenching method, the flooding of Data by the Sender can be
controlled fast than the current ECN method...right!!


>
> Notice the ECN does not go towards the sender,
> but in the other direction. I think the intention
> is to have the upper layer (transport) in the
> receiver withhold acknowledgements to cause the
> sender to back off. I'm making this up, so please

        Why at all a receiver bother about the Congetion....  I see no reasons for the
receiver to know about the congestion in the path.... because he cant do anything
about that...
And also by doing this by Source Quenching method.... its not mandatory that
both the source and destination Transport layers support the ECN capability..
If only sender is supporting, its more than enough... and there will be no necessity
to negotiate the support of this feature, end to end....
Router  also doesnt bother  whether an Endpoint is supporting  ECN or not...
he can just send an ICMP message to the sender, whether he supports ECN or not...
(slightly costly operation but thought its ok...)

Thanks
-arun

>
> correct me if I'm wrong.
>
> PMTU discovery does not face this problem. It's ok to send
> an extra packet back to the sender in this case.
>
> Arun Prasad wrote:
> >
> > Hi all,
> >     Some doubts on the procedure followed for PMTU (Path mtu) discovery and
> > ECN method.....
> >     The doubt is not related to the procedure as such, but the relation between the
> > two procedures stated above......
> > Tcp and Sctp uses ICMP message to handle the PMTU discovery procedure....
> > ie., the intermediate router will send an ICMP messge of "Message too Long"
> > to the end point sending the data packet of size greater than the MTU size of some
> > intermediate path to the destination.....
> >
> > For ECN, the intermediate router should set the appropriate bits in the IP header
> > (if it supports ECN ....) whenever there is congestion and risk of packet drops
> > is high....... The endpoints then correct their Congestion window accordingly and
> > help in reducing the Congestion in the intermediate router.....
> >
> > Why, we adopt two different methods to carry out similar (in the sense, both are
> > related to the Intermediate routers....)?????
> >     Why cant we generalise this stuff.... ie.,  the need here is some way to
> > communicate between the intermediate router and the endpoint.... Not sure
> > which of the two ways is advantageous, but cant we use the same method for
> > both..... ie.,
> > As for the PMTU discovery, the intermediate router can send an ICMP message
> > to the endpoint carrying a message "CONGESTION", by receiving this the
> > endpoint will do all appropriate actions as it does when it receives the packet set
> > with ECN-ECHO flag (as in present ECN procedure...)
> >
> > or vice versa ( ie., adopt the method followed by ECN  for PMTU discovery aslo,
> > that might be slighly tough, considering the Backward compatibility....)
> >
> >     What we can achieve by this is the simplicity  in the router implementation,
> > which doesnt need to do different procedure for different features of the Transport
> > layer..... and by maintaining this uniformity, the future extentions which demands a
> > similar requirement can use the same way......
> >
> > I could have missed some points....
> >
> > Any comments on this????
> >
> > Thanks
> > -arun
> > --
> > ****************************************************************
> > V.Arun Prasad
> > HCL Technologies Ltd.
> > 51, Jawaharlal Nehru Road,
> > Ekkattuthangal,
> > Guindy Industrial Estate,
> > Chennai - 600097.
> >
> > Contact # : 9144 - 2334174
> >             9144 - 2334181
> >             extn : 233
> > ****************************************************************
> >
> > _______________________________________________
> > tsvwg mailing list
> > tsvwg@ietf.org
> > https://www1.ietf.org/mailman/listinfo/tsvwg
>
> --
> // Jacob Heitz. Tel:510-747-2917

--
****************************************************************
V.Arun Prasad
HCL Technologies Ltd.
51, Jawaharlal Nehru Road,
Ekkattuthangal,
Guindy Industrial Estate,
Chennai - 600097.

Contact # : 9144 - 2334174
            9144 - 2334181
            extn : 233
****************************************************************




From owner-tcp-impl@grc.nasa.gov  Tue Apr  9 06:32:54 2002
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Message-ID: <3CB2C285.FA4806AB@lucent.com>
Date: Tue, 09 Apr 2002 03:29:25 -0700
From: Jacob Heitz <jheitz@lucent.com>
Organization: Lucent Technologies, Internetworking Systems, Software Engineering, 
 Alameda
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        sctp <sctpimp@netlab.hcltech.com>
Subject: Re: [Tsvwg] ECN & PMTU
References: <3CADF78E.D9E24D26@cisco.com> <3CB20DBE.3B687309@cisco.com> <3CB27092.7680BC16@netlab.hcltech.com> <3CB285B4.9E8FBBA4@lucent.com> <3CB2BB02.21AA779C@netlab.hcltech.com>
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First of all, I gave a reason why it is so.
If you think another way is better,
that's nice, but you won't change anything.

Source quenching was always controversial.
It is considered higher impact, because it adds
an extra packet to the network. Setting a CE
bit adds nothing that was not there before anyway,
so is considered to be safer, or lower impact.

Yes, it's slower than having the congested router
send an ICMP.

The end receiver sends an ACK anyway. Let it modify
or withhold that ACK. This is what the receiver can
do. It would send the ACK anyway, thus nothing
extra is added to the network.

But consider these points:

A network is made of different makes/models of routers.
A router may consider itself congested in all
directions at once when it runs low on buffer memory.
Then it may send ICMPs every which way.

If a path is congested at many routers, each may send
an ICMP in the reverse direction, resulting in a
multitude of ICMPs reaching the sender.

When congestion collapse looms, safety first is the
golden rule: add nothing more that was not already
there anyway.

Arun Prasad wrote:
> 
> hi jacob,
> 
> Jacob Heitz wrote:
> 
> > One reason: sending extra packets in the face
> > of congestion will worsen the congestion.
> > Congestion collapse could be a very serious possible
> > consequence of sending extra packets.
> 
>          I couldnt get the point of, sending extra packets during congestion.....
> Say if a Router decides that there will be congestion ( its not in congestion now...)
> then it decides to set the ECN bit in the IP header of certain packets in the Queue...
> These packets should reach the receiver endpoint.... then the receiver will
> send a ACK to the sender to indicate there is a congestion..... Doesnt this too
> long a process.... ie., anyway a SACK is to be sent from the Receiver to the
> sender....  In that case why not an ICMP packet from the router to the sender???
> 
> And also, since the extra packets are going to flow in the opposite direction
> of the actual congestion, I couldnt see any harm .... (I know this might be a
> wrong statemnent.... but I dont have the right justification...)
> 
> Atleast in Source Quenching method, the flooding of Data by the Sender can be
> controlled fast than the current ECN method...right!!
> 
> >
> > Notice the ECN does not go towards the sender,
> > but in the other direction. I think the intention
> > is to have the upper layer (transport) in the
> > receiver withhold acknowledgements to cause the
> > sender to back off. I'm making this up, so please
> 
>         Why at all a receiver bother about the Congetion....  I see no reasons for the
> receiver to know about the congestion in the path.... because he cant do anything
> about that...
> And also by doing this by Source Quenching method.... its not mandatory that
> both the source and destination Transport layers support the ECN capability..
> If only sender is supporting, its more than enough... and there will be no necessity
> to negotiate the support of this feature, end to end....
> Router  also doesnt bother  whether an Endpoint is supporting  ECN or not...
> he can just send an ICMP message to the sender, whether he supports ECN or not...
> (slightly costly operation but thought its ok...)
> 
> Thanks
> -arun
> 
> >
> > correct me if I'm wrong.
> >
> > PMTU discovery does not face this problem. It's ok to send
> > an extra packet back to the sender in this case.
> >
> > Arun Prasad wrote:
> > >
> > > Hi all,
> > >     Some doubts on the procedure followed for PMTU (Path mtu) discovery and
> > > ECN method.....
> > >     The doubt is not related to the procedure as such, but the relation between the
> > > two procedures stated above......
> > > Tcp and Sctp uses ICMP message to handle the PMTU discovery procedure....
> > > ie., the intermediate router will send an ICMP messge of "Message too Long"
> > > to the end point sending the data packet of size greater than the MTU size of some
> > > intermediate path to the destination.....
> > >
> > > For ECN, the intermediate router should set the appropriate bits in the IP header
> > > (if it supports ECN ....) whenever there is congestion and risk of packet drops
> > > is high....... The endpoints then correct their Congestion window accordingly and
> > > help in reducing the Congestion in the intermediate router.....
> > >
> > > Why, we adopt two different methods to carry out similar (in the sense, both are
> > > related to the Intermediate routers....)?????
> > >     Why cant we generalise this stuff.... ie.,  the need here is some way to
> > > communicate between the intermediate router and the endpoint.... Not sure
> > > which of the two ways is advantageous, but cant we use the same method for
> > > both..... ie.,
> > > As for the PMTU discovery, the intermediate router can send an ICMP message
> > > to the endpoint carrying a message "CONGESTION", by receiving this the
> > > endpoint will do all appropriate actions as it does when it receives the packet set
> > > with ECN-ECHO flag (as in present ECN procedure...)
> > >
> > > or vice versa ( ie., adopt the method followed by ECN  for PMTU discovery aslo,
> > > that might be slighly tough, considering the Backward compatibility....)
> > >
> > >     What we can achieve by this is the simplicity  in the router implementation,
> > > which doesnt need to do different procedure for different features of the Transport
> > > layer..... and by maintaining this uniformity, the future extentions which demands a
> > > similar requirement can use the same way......
> > >
> > > I could have missed some points....
> > >
> > > Any comments on this????
> > >
> > > Thanks
> > > -arun
> > > --
> > > ****************************************************************
> > > V.Arun Prasad
> > > HCL Technologies Ltd.
> > > 51, Jawaharlal Nehru Road,
> > > Ekkattuthangal,
> > > Guindy Industrial Estate,
> > > Chennai - 600097.
> > >
> > > Contact # : 9144 - 2334174
> > >             9144 - 2334181
> > >             extn : 233
> > > ****************************************************************
> > >
> > > _______________________________________________
> > > tsvwg mailing list
> > > tsvwg@ietf.org
> > > https://www1.ietf.org/mailman/listinfo/tsvwg
> >
> > --
> > // Jacob Heitz. Tel:510-747-2917
> 
> --
> ****************************************************************
> V.Arun Prasad
> HCL Technologies Ltd.
> 51, Jawaharlal Nehru Road,
> Ekkattuthangal,
> Guindy Industrial Estate,
> Chennai - 600097.
> 
> Contact # : 9144 - 2334174
>             9144 - 2334181
>             extn : 233
> ****************************************************************

-- 
// Jacob Heitz. Tel:510-747-2917


From owner-tcp-impl@grc.nasa.gov  Tue Apr  9 07:26:07 2002
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Subject: Re: [Tsvwg] ECN & PMTU
References: <3CADF78E.D9E24D26@cisco.com> <3CB20DBE.3B687309@cisco.com> <3CB27092.7680BC16@netlab.hcltech.com> <3CB285B4.9E8FBBA4@lucent.com> <3CB2BB02.21AA779C@netlab.hcltech.com> <3CB2C285.FA4806AB@lucent.com>
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hi jacob,


Jacob Heitz wrote:

> First of all, I gave a reason why it is so.
> If you think another way is better,
> that's nice, but you won't change anything.
>

    thats slightly harsh.....

>
> Source quenching was always controversial.
> It is considered higher impact, because it adds
> an extra packet to the network. Setting a CE
> bit adds nothing that was not there before anyway,
> so is considered to be safer, or lower impact.
>
> Yes, it's slower than having the congested router
> send an ICMP.
>
> The end receiver sends an ACK anyway. Let it modify
> or withhold that ACK. This is what the receiver can
> do. It would send the ACK anyway, thus nothing
> extra is added to the network.
>
> But consider these points:
>
> A network is made of different makes/models of routers.
> A router may consider itself congested in all
> directions at once when it runs low on buffer memory.
> Then it may send ICMPs every which way.
>
> If a path is congested at many routers, each may send
> an ICMP in the reverse direction, resulting in a
> multitude of ICMPs reaching the sender.
>

    Ya, I got the point.... The above point really justifies the reason of not
selecting Source Quenching for ECN..... ( That may be obvious, but I missed
it....).. Thanks for this...

>
> When congestion collapse looms, safety first is the
> golden rule: add nothing more that was not already
> there anyway.
>


Thanks
-arun

>
> Arun Prasad wrote:
> >
> > hi jacob,
> >
> > Jacob Heitz wrote:
> >
> > > One reason: sending extra packets in the face
> > > of congestion will worsen the congestion.
> > > Congestion collapse could be a very serious possible
> > > consequence of sending extra packets.
> >
> >          I couldnt get the point of, sending extra packets during congestion.....
> > Say if a Router decides that there will be congestion ( its not in congestion now...)
> > then it decides to set the ECN bit in the IP header of certain packets in the Queue...
> > These packets should reach the receiver endpoint.... then the receiver will
> > send a ACK to the sender to indicate there is a congestion..... Doesnt this too
> > long a process.... ie., anyway a SACK is to be sent from the Receiver to the
> > sender....  In that case why not an ICMP packet from the router to the sender???
> >
> > And also, since the extra packets are going to flow in the opposite direction
> > of the actual congestion, I couldnt see any harm .... (I know this might be a
> > wrong statemnent.... but I dont have the right justification...)
> >
> > Atleast in Source Quenching method, the flooding of Data by the Sender can be
> > controlled fast than the current ECN method...right!!
> >
> > >
> > > Notice the ECN does not go towards the sender,
> > > but in the other direction. I think the intention
> > > is to have the upper layer (transport) in the
> > > receiver withhold acknowledgements to cause the
> > > sender to back off. I'm making this up, so please
> >
> >         Why at all a receiver bother about the Congetion....  I see no reasons for the
> > receiver to know about the congestion in the path.... because he cant do anything
> > about that...
> > And also by doing this by Source Quenching method.... its not mandatory that
> > both the source and destination Transport layers support the ECN capability..
> > If only sender is supporting, its more than enough... and there will be no necessity
> > to negotiate the support of this feature, end to end....
> > Router  also doesnt bother  whether an Endpoint is supporting  ECN or not...
> > he can just send an ICMP message to the sender, whether he supports ECN or not...
> > (slightly costly operation but thought its ok...)
> >
> > Thanks
> > -arun
> >
> > >
> > > correct me if I'm wrong.
> > >
> > > PMTU discovery does not face this problem. It's ok to send
> > > an extra packet back to the sender in this case.
> > >
> > > Arun Prasad wrote:
> > > >
> > > > Hi all,
> > > >     Some doubts on the procedure followed for PMTU (Path mtu) discovery and
> > > > ECN method.....
> > > >     The doubt is not related to the procedure as such, but the relation between the
> > > > two procedures stated above......
> > > > Tcp and Sctp uses ICMP message to handle the PMTU discovery procedure....
> > > > ie., the intermediate router will send an ICMP messge of "Message too Long"
> > > > to the end point sending the data packet of size greater than the MTU size of some
> > > > intermediate path to the destination.....
> > > >
> > > > For ECN, the intermediate router should set the appropriate bits in the IP header
> > > > (if it supports ECN ....) whenever there is congestion and risk of packet drops
> > > > is high....... The endpoints then correct their Congestion window accordingly and
> > > > help in reducing the Congestion in the intermediate router.....
> > > >
> > > > Why, we adopt two different methods to carry out similar (in the sense, both are
> > > > related to the Intermediate routers....)?????
> > > >     Why cant we generalise this stuff.... ie.,  the need here is some way to
> > > > communicate between the intermediate router and the endpoint.... Not sure
> > > > which of the two ways is advantageous, but cant we use the same method for
> > > > both..... ie.,
> > > > As for the PMTU discovery, the intermediate router can send an ICMP message
> > > > to the endpoint carrying a message "CONGESTION", by receiving this the
> > > > endpoint will do all appropriate actions as it does when it receives the packet set
> > > > with ECN-ECHO flag (as in present ECN procedure...)
> > > >
> > > > or vice versa ( ie., adopt the method followed by ECN  for PMTU discovery aslo,
> > > > that might be slighly tough, considering the Backward compatibility....)
> > > >
> > > >     What we can achieve by this is the simplicity  in the router implementation,
> > > > which doesnt need to do different procedure for different features of the Transport
> > > > layer..... and by maintaining this uniformity, the future extentions which demands a
> > > > similar requirement can use the same way......
> > > >
> > > > I could have missed some points....
> > > >
> > > > Any comments on this????
> > > >
> > > > Thanks
> > > > -arun
> > > > --
> > > > ****************************************************************
> > > > V.Arun Prasad
> > > > HCL Technologies Ltd.
> > > > 51, Jawaharlal Nehru Road,
> > > > Ekkattuthangal,
> > > > Guindy Industrial Estate,
> > > > Chennai - 600097.
> > > >
> > > > Contact # : 9144 - 2334174
> > > >             9144 - 2334181
> > > >             extn : 233
> > > > ****************************************************************
> > > >
> > > > _______________________________________________
> > > > tsvwg mailing list
> > > > tsvwg@ietf.org
> > > > https://www1.ietf.org/mailman/listinfo/tsvwg
> > >
> > > --
> > > // Jacob Heitz. Tel:510-747-2917
> >
> > --
> > ****************************************************************
> > V.Arun Prasad
> > HCL Technologies Ltd.
> > 51, Jawaharlal Nehru Road,
> > Ekkattuthangal,
> > Guindy Industrial Estate,
> > Chennai - 600097.
> >
> > Contact # : 9144 - 2334174
> >             9144 - 2334181
> >             extn : 233
> > ****************************************************************
>
> --
> // Jacob Heitz. Tel:510-747-2917

--
****************************************************************
V.Arun Prasad
HCL Technologies Ltd.
51, Jawaharlal Nehru Road,
Ekkattuthangal,
Guindy Industrial Estate,
Chennai - 600097.

Contact # : 9144 - 2334174
            9144 - 2334181
            extn : 233
****************************************************************




From owner-tcp-impl@grc.nasa.gov  Tue Apr  9 13:20:48 2002
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Subject: Re: [Tsvwg] ECN & PMTU
References: <3CADF78E.D9E24D26@cisco.com> <3CB20DBE.3B687309@cisco.com> <3CB27092.7680BC16@netlab.hcltech.com> <3CB285B4.9E8FBBA4@lucent.com> <3CB2BB02.21AA779C@netlab.hcltech.com> <3CB2C285.FA4806AB@lucent.com>
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[I promise not to get sucked into this again, but a few clarifications are
in order.]

Jacob Heitz wrote:

> Source quenching was always controversial.
> It is considered higher impact, because it adds
> an extra packet to the network. Setting a CE
> bit adds nothing that was not there before anyway,
> so is considered to be safer, or lower impact.

...unless you also consider the TCP retransmissions to be expensive.

> Yes, it's slower than having the congested router
> send an ICMP.

> The end receiver sends an ACK anyway. Let it modify
> or withhold that ACK. This is what the receiver can
> do. It would send the ACK anyway, thus nothing
> extra is added to the network.
> 
> But consider these points:
> 
> A network is made of different makes/models of routers.
> A router may consider itself congested in all
> directions at once when it runs low on buffer memory.
> Then it may send ICMPs every which way.

Is it going to start dropping packets anyway?

> If a path is congested at many routers, each may send
> an ICMP in the reverse direction, resulting in a
> multitude of ICMPs reaching the sender.

Good point.

> When congestion collapse looms, safety first is the
> golden rule: add nothing more that was not already
> there anyway.

On half-duplex links, that is a good idea.

-- 
Eric A. Hall                                        http://www.ehsco.com/
Internet Core Protocols          http://www.oreilly.com/catalog/coreprot/


From owner-tcp-impl@grc.nasa.gov  Tue Apr  9 16:18:52 2002
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From: Srivathsa <sriva@lucent.com>
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        sctp <sctpimp@netlab.hcltech.com>
Subject: Re: ECN & PMTU
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Arun Prasad wrote:
> 
> Hi all,
>     Some doubts on the procedure followed for PMTU (Path mtu) discovery and
> ECN method.....
>     The doubt is not related to the procedure as such, but the relation between the
> two procedures stated above......
> Tcp and Sctp uses ICMP message to handle the PMTU discovery procedure....
> ie., the intermediate router will send an ICMP messge of "Message too Long"
> to the end point sending the data packet of size greater than the MTU size of some
> intermediate path to the destination.....
> 
> For ECN, the intermediate router should set the appropriate bits in the IP header
> (if it supports ECN ....) whenever there is congestion and risk of packet drops
> is high....... The endpoints then correct their Congestion window accordingly and
> help in reducing the Congestion in the intermediate router.....
> 
> Why, we adopt two different methods to carry out similar (in the sense, both are
> related to the Intermediate routers....)?????

Arun,
   I dont really see how the 2 situations are similar.
In the PMTU case,  the network is in normal state.

In the ECN case, there is a congestion at the router. The router cant
afford to pump more packets into the network.  In the earlier internet,
the source quench mechanism was used to combat congestion  (i.e router
sends an ICMP to the source).  In a quick evolution, routers started
using a packet-drop mechanism to combat congestion (It didnt make sense
to pump more packets into a congested network).  Now, ECN is being
recommended to combat congestion VERY EARLY. 
  i.e PMTU-like-mechanism cant be used for ECN.


>     Why cant we generalise this stuff.... ie.,  the need here is some way to
> communicate between the intermediate router and the endpoint.... Not sure
> which of the two ways is advantageous, but cant we use the same method for
> both..... ie.,
> As for the PMTU discovery, the intermediate router can send an ICMP message
> to the endpoint carrying a message "CONGESTION", by receiving this the
> endpoint will do all appropriate actions as it does when it receives the packet set
> with ECN-ECHO flag (as in present ECN procedure...)
> 
> or vice versa ( ie., adopt the method followed by ECN  for PMTU discovery aslo,
> that might be slighly tough, considering the Backward compatibility....)
> 


You cant use a ECN-like-mechanism for PMTU discovery.   As soon as an
intermediate router discovers that the packet (with DontFragment bit set
) is too large for one of its outbound interfaces,   it will have to
discard the packet.  I.e it cant relay the packet to the
destination.      In ECN scenario,  packet can still be relayed further.

-Srivathsa


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Srivathsa wrote:

> >     Why cant we generalise this stuff.... ie.,  the need here is some way to
> > communicate between the intermediate router and the endpoint.... Not sure
> > which of the two ways is advantageous, but cant we use the same method for
> > both..... ie.,
> > As for the PMTU discovery, the intermediate router can send an ICMP message
> > to the endpoint carrying a message "CONGESTION", by receiving this the
> > endpoint will do all appropriate actions as it does when it receives the packet set
> > with ECN-ECHO flag (as in present ECN procedure...)
> >
> > or vice versa ( ie., adopt the method followed by ECN  for PMTU discovery aslo,
> > that might be slighly tough, considering the Backward compatibility....)
> >
>
> You cant use a ECN-like-mechanism for PMTU discovery.   As soon as an
> intermediate router discovers that the packet (with DontFragment bit set
> ) is too large for one of its outbound interfaces,   it will have to
> discard the packet.  I.e it cant relay the packet to the
> destination.      In ECN scenario,  packet can still be relayed further.
>

            Ya, I agree that......  But the  method by which PMTU discovery is done
can be changed to avoid packet drops (if dropping a packet is costly... I think
yes, because it triggers Retransmissions....). We might rethink about implementing PMTU
discovery like the ECN like mechanism, with this new proposal..... The idea is

there should be  someother bit like the DF bit, say IF bit (Inform on Fragmentation) in the
IP header..... This IF bit will be set by the Transport layers if it is planning to do the PMTU
discovery.....  The router upon receiving a packet of size greater than the MTU size of the
Egress interface and the IF bit is set in the IP header... then IP layer there will go ahead
 fragmenting the packet and sending it to the destination..., but also send an ICMP
"Message too Long" message to the Sender.....  The router also sets the DF bit, and
unsets the IF bit in the IP header of the fragment packets (which ensure no more
fragmentation is done on the packet....)  ..................The sender upon receiving the ICMP
packet will just update his PMTU... Thus there is no Packet drops... so the procedure of
PMTU discovery will not  trigger any Retransmissions.... (which is expensive, because
the transport layer shrinks the Congestion window if it senses that a packe is dropped...)


Not sure whether this is already discussed or proposed etc...


Thanks
-arun

>
> -Srivathsa

--
****************************************************************
V.Arun Prasad
HCL Technologies Ltd.
51, Jawaharlal Nehru Road,
Ekkattuthangal,
Guindy Industrial Estate,
Chennai - 600097.

Contact # : 9144 - 2334174
            9144 - 2334181
            extn : 233
****************************************************************




From owner-tcp-impl@grc.nasa.gov  Wed Apr 10 01:59:25 2002
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To: Arun Prasad <arun@netlab.hcltech.com>
Cc: Srivathsa <sriva@lucent.com>, tsvwg <tsvwg@ietf.org>,
        tcp-impl@grc.nasa.gov, e2e <end2end-interest@postel.org>,
        sctp <sctpimp@netlab.hcltech.com>
Subject: Re: [Tsvwg] Re: ECN & PMTU
References: <3CADF78E.D9E24D26@cisco.com> <3CB20DBE.3B687309@cisco.com> <3CB27092.7680BC16@netlab.hcltech.com> <3CB3585A.7E7C670C@lucent.com> <3CB3BE57.2655E29C@netlab.hcltech.com>
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Arun Prasad wrote:

> Srivathsa wrote:
>
> > >     Why cant we generalise this stuff.... ie.,  the need here is some way to
> > > communicate between the intermediate router and the endpoint.... Not sure
> > > which of the two ways is advantageous, but cant we use the same method for
> > > both..... ie.,
> > > As for the PMTU discovery, the intermediate router can send an ICMP message
> > > to the endpoint carrying a message "CONGESTION", by receiving this the
> > > endpoint will do all appropriate actions as it does when it receives the packet set
> > > with ECN-ECHO flag (as in present ECN procedure...)
> > >
> > > or vice versa ( ie., adopt the method followed by ECN  for PMTU discovery aslo,
> > > that might be slighly tough, considering the Backward compatibility....)
> > >
> >
> > You cant use a ECN-like-mechanism for PMTU discovery.   As soon as an
> > intermediate router discovers that the packet (with DontFragment bit set
> > ) is too large for one of its outbound interfaces,   it will have to
> > discard the packet.  I.e it cant relay the packet to the
> > destination.      In ECN scenario,  packet can still be relayed further.
> >
>
>             Ya, I agree that......  But the  method by which PMTU discovery is done
> can be changed to avoid packet drops (if dropping a packet is costly... I think
> yes, because it triggers Retransmissions....). We might rethink about implementing PMTU
> discovery like the ECN like mechanism, with this new proposal..... The idea is
>
> there should be  someother bit like the DF bit, say IF bit (Inform on Fragmentation) in the
> IP header..... This IF bit will be set by the Transport layers if it is planning to do the PMTU
> discovery.....  The router upon receiving a packet of size greater than the MTU size of the
> Egress interface and the IF bit is set in the IP header... then IP layer there will go ahead
>  fragmenting the packet and sending it to the destination..., but also send an ICMP
> "Message too Long" message to the Sender.....  The router also sets the DF bit, and
> unsets the IF bit in the IP header of the fragment packets (which ensure no more
> fragmentation is done on the packet....)  ..................The sender upon receiving the ICMP
> packet will just update his PMTU... Thus there is no Packet drops... so the procedure of
> PMTU discovery will not  trigger any Retransmissions.... (which is expensive, because
> the transport layer shrinks the Congestion window if it senses that a packe is dropped...)

I dont understand, PMTU discovery requires that TCP go into a retransmission of all its
unacknowledged packets if there is a change in MSS.

Also in ur scheme by forwarding the fragments with DF bit on won't u  be triggering
drops in a downstream router with a smaller next hop MTU than the just announced
PMTU ?

Murali

>
>
> Not sure whether this is already discussed or proposed etc...
>
> Thanks
> -arun
>
> >
> > -Srivathsa
>
> --
> ****************************************************************
> V.Arun Prasad
> HCL Technologies Ltd.
> 51, Jawaharlal Nehru Road,
> Ekkattuthangal,
> Guindy Industrial Estate,
> Chennai - 600097.
>
> Contact # : 9144 - 2334174
>             9144 - 2334181
>             extn : 233
> ****************************************************************
>
> _______________________________________________
> tsvwg mailing list
> tsvwg@ietf.org
> https://www1.ietf.org/mailman/listinfo/tsvwg



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Date: Wed, 10 Apr 2002 10:04:42 +0200
From: Marcel Waldvogel <marcel@news.m.wanda.ch>
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To: Arun Prasad <arun@netlab.hcltech.com>
Cc: Srivathsa <sriva@lucent.com>, tsvwg <tsvwg@ietf.org>,
        tcp-impl@grc.nasa.gov, e2e <end2end-interest@postel.org>,
        sctp <sctpimp@netlab.hcltech.com>
Subject: Re: [e2e] ECN & PMTU
References: <3CADF78E.D9E24D26@cisco.com> <3CB20DBE.3B687309@cisco.com> <3CB27092.7680BC16@netlab.hcltech.com> <3CB3585A.7E7C670C@lucent.com> <3CB3BE57.2655E29C@netlab.hcltech.com>
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Arun Prasad wrote:
 > Ya, I agree that...... But the method by which PMTU discovery is done
 > can be changed to avoid packet drops (if dropping a packet is
 > costly... I think yes, because it triggers Retransmissions....). We
 > might rethink about implementing PMTU discovery like the ECN like
 > mechanism, with this new proposal..... The idea is there should be
 > someother bit like the DF bit, say IF bit (Inform on Fragmentation) in
 > the IP header..... This IF bit will be set by the Transport layers if
 > it is planning to do the PMTU discovery..... The router upon receiving
 > a packet of size greater than the MTU size of the Egress interface and
 > the IF bit is set in the IP header... then IP layer there will go
 > ahead fragmenting the packet and sending it to the destination..., but
 > also send an ICMP "Message too Long" message to the Sender..... The
 > router also sets the DF bit, and unsets the IF bit in the IP header of
 > the fragment packets (which ensure no more fragmentation is done on
 > the packet....) ..................The sender upon receiving the ICMP
 > packet will just update his PMTU... Thus there is no Packet drops...
 > so the procedure of PMTU discovery will not trigger any
 > Retransmissions.... (which is expensive, because the transport layer
 > shrinks the Congestion window if it senses that a packe is dropped...)

I like the idea of an "Inform-on-Fragmentation" bit, as this would get
the PMTU right within one RTT *and* not require any retransmits. I do
not agree with your DF/IF interaction, instead I propose my own rules
(downward compatible, single RTT, no retransmit (exception below)):

* IF overrides DF.
  Any IF-capable router will ignore DF on packets that have IF set. IF
  is more powerful than DF, but DF will be needed during a transition
  period.
* Routers do not modify the IF/DF bits.
  When the sender sets IF and DF (probably the common case), there is
  no need for that.
* Routers send back an "ICMP Fragmentation needed," indicating it was
  due to IF.
  This is preferably done only on the first fragment (i.e., offset=0).
* IF-capable routers that don't want to/can't fully perform
  fragmentation (e.g., IPv6) shorten the packet into the first
  fragment.
  The "Fragmentation needed" message then contains the information
  that the packet needs to be resent.

-Marcel




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              target=3D_blank><FONT color=3D#0000ff>2nd WSEAS Int. Conf. =
on=20
              ROBOTICS, DISTANCE LEARNING and INTELLIGENT COMMUNICATION =
SYSTEMS=20
              (ICRODIC 2002)</FONT></A></LI></UL>
            <P align=3Dcenter><BR>
            <CENTER><A=20
            =
href=3D"http://www.wseas.org/conferences/2002/skiathos/447-Skiathos.doc">=
CALL=20
            FOR PAPERS (.doc file. Print out, distribute, put in your=20
            announcement board. Size: 97.5 Kb)</A><BR></CENTER><BR>
            <DIV align=3Dcenter><IMG=20
            =
src=3D"http://www.wseas.org/conferences/2002/skiathos/0sk01.jpg"=20
            width=3D432></DIV><BR>
            <DIV align=3Dcenter>CONFERENCE PLACE: Skiathos Island,=20
            Greece<BR></BIG>&nbsp; </DIV></TD></TR></TBODY></TABLE></P>
      <P align=3Dcenter><A><STRONG><FONT color=3D#0000ff>Deadline for =
paper=20
      submission,</FONT><FONT color=3D#0000ff face=3D"Times New Roman"> =
APRIL=20
      30,&nbsp; =
2002<BR></P></FONT></STRONG></A></TD></TR></TBODY></TABLE>
<TABLE bgColor=3D#ffffff border=3D0 height=3D60 width=3D610>
  <TBODY>
  <TR>
    <TD width=3D602>
      <CENTER><BR><FONT size=3D2><A href=3D"http://www.wseas.org/wseas/" =

      target=3D_blank>Sponsored by: The World Scientific and Engineering =
Society=20
      (WSES)</A></FONT><A href=3D"http://www.wseas.org/wseas/"=20
      target=3D_blank><BR></A><FONT size=3D2><A=20
      href=3D"http://www.wseas.org/wseas/wses7.htm" target=3D_blank>WSES =
Sector of=20
      Electrical Engineering, WSES Sector of Mechanical Engineering, =
WSES Sector=20
      of Chemical Engineering, WSES Sector of Oceanic Engineering, WSES =
Sector=20
      of Aerospace Engineering, WSES Soft Computing Technical Committee, =
WSES=20
      Automatic Control Technical Committee, WSES Instrumentation and=20
      Measurement Technical Committee. WSES Electronics Technical =
Committee,=20
      WSES Circuits and Systems Committee,</A><BR></FONT></CENTER><FONT=20
      size=3D2><BR><BR><B><FONT color=3D#ff0000><BIG>FOUR IMPORTANT =
POINTS THAT YOU=20
      MUST NOTE! ! ! <BR></BIG></FONT></B><BIG><FONT=20
      =
color=3D#000000>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D<BR><B><FONT=20
      color=3D#ff0000>((</FONT></B></FONT></BIG><B><FONT=20
      color=3D#ff0000><BIG>1</BIG></FONT><FONT color=3D#000000><FONT=20
      color=3D#ff0000><BIG>)) </BIG></FONT></FONT></B><FONT =
color=3D#000000><FONT=20
      color=3D#ff0000><BIG><FONT color=3D#000000>In WSEAS Conferences =
all the=20
      accepted papers are simultaneously published in two different=20
      international fora:<BR>in<B><BR>Proceedings + Luxurious =
International=20
      Post-Conference Books<BR>&nbsp;or</B></FONT>=20
      </BIG></FONT><B><BIG>&nbsp;</BIG><BIG><FONT=20
      =
color=3D#ff0000><BR></FONT></BIG></B></FONT><B><BIG>in<BR>Proceedings +=20
      WSEAS Transactions:<BR></BIG></B><BIG><FONT =
color=3D#000000><B>WSEAS=20
      TRANSACTIONS ON </B><B>CIRCUITS<BR>WSEAS TRANSACTIONS ON =
SYSTEMS<BR>WSEAS=20
      TRANSACTIONS ON COMMUNICATIONS<BR>WSEAS TRANSACTIONS ON COMPUTERS=20
      <BR>WSEAS TRANSACTIONS ON MATHEMATICS <BR></B><BR><BR><B><FONT=20
      color=3D#ff0000>((</FONT></FONT></BIG><FONT=20
      color=3D#ff0000><BIG>2</BIG></FONT><FONT =
color=3D#000000><BIG><FONT=20
      color=3D#ff0000>))</FONT></BIG></FONT></B> </FONT><FONT=20
      size=3D3><B>Skiathos</B>. Skiathos is a beautiful, wooded island, =
far=20
      greener than one would expect a Greek island to be, which has =
between 60=20
      &amp; 70 fine sandy beaches, many of which have not become =
overcrowded=20
      &amp; some of which can be virtually empty, even in the height of =
summer.=20
      The environment is incredibly varied &amp; can range from hidden, =
wooded=20
      valleys (like our own in Zorbathes) to Monasteries set against a =
backdrop=20
      of barren rock, from shallow beaches with pastures behind to =
plunging=20
      cliffs with beaches nestling below them, only accessible by boat. =
There=20
      are several offshore islands which are worth visiting and where =
you will=20
      find beaches with less people on them than the main island =
ones.</FONT>=20
      <FONT size=3D2><BR><FONT color=3D#000000><BIG><BR>More =
Description? See the=20
      web site </BIG></FONT></FONT><STRONG><FONT color=3D#0000ff=20
      face=3D"Times New Roman"><A=20
      =
href=3D"http://www.wseas.org">http://www.wseas.org</A></FONT></STRONG> =
<A>
      <P><FONT size=3D2><BIG><FONT color=3D#000000><BR><B><FONT=20
      color=3D#ff0000>((</FONT></FONT></BIG><FONT=20
      color=3D#ff0000><BIG>3</BIG></FONT><BIG><FONT =
color=3D#000000><FONT=20
      color=3D#ff0000>)) </FONT><FONT color=3D#000000>SOCIAL AND =
CULTURAL PART OF=20
      THE CONFERENCE</FONT></FONT></BIG></B> <FONT =
color=3D#000000><BIG><FONT=20
      color=3D#000000>of high standards <BR><BR><B>FOR MORE INFORMATION =
SEE THE=20
      WEB SITE. </B></P>
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------=_NextPart_000_0014_01C1E160.2637B6A0--



From owner-tcp-impl@grc.nasa.gov  Mon Apr 15 16:44:58 2002
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From: Bob Braden <braden@ISI.EDU>
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Date: Mon, 15 Apr 2002 20:17:07 GMT
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To: tcp-impl@grc.nasa.gov
Subject: XXX-implementors?
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I have an organizational question.  This mailing list concerns the
implementation of TCP.  Is there another mailing list for implementation
issues of SCTP?  I can imagine that there might be some overlap, e.g.,
in congestion control issues; should this mailing list be tsv-impl
instead of tcp-impl??

Bob Braden



From owner-tcp-impl@grc.nasa.gov  Mon Apr 15 17:40:10 2002
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From: "Vishnepolsky, Oleg" <ovishnepolsky@doubleclick.net>
To: "'tcp-impl@grc.nasa.gov'" <tcp-impl@grc.nasa.gov>
Subject: Summary of differences between MS TCP/IP stack and BSD
Date: Mon, 15 Apr 2002 17:30:28 -0400
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I am looking for a summary of major differences between MS TCP/IP stack and
BSD. For example, MS sends a RST when its connection queue gets full. Many
thanks in advance.

Oleg Vishnepolsky


From owner-tcp-impl@grc.nasa.gov  Mon Apr 15 18:13:38 2002
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From: "Douglas Otis" <dotis@sanlight.net>
To: <tcp-impl@grc.nasa.gov>
Subject: RE: XXX-implementors?
Date: Mon, 15 Apr 2002 15:05:13 -0700
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Bob,

The tsvwg reflector (tsvwg@ietf.org) actively provides feedback on SCTP as
there are several outstanding related documents still in process.  There
appears to be a desire to introduce many of the framing like features of
SCTP into TCP by those wishing to incorporate in high level NICs either
iSCSI or iWARP applications.  This may suggest a common reflector would be
desired.  SCTP and TCP should ensure network fairness if algorithms change.

These TCP (SCTP like) features are:

 - Aligned placement headers with isolated verification/placement/integrity
checks used to handle internal routing of data payloads checked on the fly.

 - Implied TCP framing verification.  (Would a dual CRC (header/payload)
provide needed error checks against framing loss?)

 - TLV bundling of objects for maximal packet size, or will small packets at
> 1Gb/s data rates not be a concern?

If modifications of TCP move forward, then the difference between TCP and
SCTP grows small and yet differences in implementation may provide
justification such as:

 - Should TCP be optimized for Ethernet or InfiniBand for future data rates.

Doug


On April 15, 2002 1:17 PM Bob Braden (braden@ISI.EDU) wrote:
>
> I have an organizational question.  This mailing list concerns the
> implementation of TCP.  Is there another mailing list for implementation
> issues of SCTP?  I can imagine that there might be some overlap, e.g.,
> in congestion control issues; should this mailing list be tsv-impl
> instead of tcp-impl??
>
> Bob Braden
>



From owner-tcp-impl@grc.nasa.gov  Tue Apr 16 16:44:48 2002
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Date: Tue, 16 Apr 2002 16:28:24 -0400 (EDT)
From: Kostas Pentikousis <kostas@cs.sunysb.edu>
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To: Jacob Heitz <jheitz@lucent.com>
Cc: Arun Prasad <arun@netlab.hcltech.com>, tsvwg <tsvwg@ietf.org>,
        <tcp-impl@grc.nasa.gov>
Subject: Re: [Tsvwg] ECN & PMTU
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On Tue, 9 Apr 2002, Jacob Heitz wrote:

[...]
  | Source quenching was always controversial.
  | It is considered higher impact, because it adds
  | an extra packet to the network. Setting a CE
  | bit adds nothing that was not there before anyway,
  | so is considered to be safer, or lower impact.
  |
  | Yes, it's slower than having the congested router
  | send an ICMP.

I'm not sure that's really true. In fact, I've heard several times that Source
Quench (SQ) via ICMP is more expensive for current generation routers than
setting a bit. I remember reading that any packets needing "special" treatment
are placed in a separate (lower priority) queue and are dealt with when the
router load drops (a bit). Setting a bit is not considered "special" treatment
but creating a packet (setting source and destination addresses, etc.) is. If
this is true, and ECN was spec'ed so that the router would send an SQ ICMP
packet back to the sender instead of setting a bit (RFC 3168), then in most
cases the congestion notification would actually arrive later than an RTT.

Just my $0.02,

Kostas
______________________________________________________________________
Kostas Pentikousis @ CS Stony Brook @ http://www.cs.sunysb.edu/~kostas



From owner-tcp-impl@grc.nasa.gov  Wed Apr 17 14:16:15 2002
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Message-ID: <03E81ABDC8C2D31192C9009027D5B86E08ADB6CD@NYC-EX03>
From: "Vishnepolsky, Oleg" <ovishnepolsky@doubleclick.net>
To: "'tcp-impl@grc.nasa.gov'" <tcp-impl@grc.nasa.gov>
Subject: linear search of TCP control blocks on demultiplexing of an incom
	ing IP datagram
Date: Wed, 17 Apr 2002 14:06:10 -0400
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Which TCP implementations do a hash lookup ? I know that most BSD
derivatives do a linear search, except for the freebsd stack which does a
hash. What about MS stacks ? My stacks (OS/2, FlexOS) being BSD derivatives
used linear search except I used a one control block cache lookup since most
of the TCP packets come in "trains". I had a 70% hit ration in my
experiments.
Is there a study/comparison of various TCP stacks re this and many other
characteristics ? I am aware of external TCP fingerprinting  but that does
not reveal the internals that much. Any help will be appreciated.
Oleg Vishnepolsky



From owner-tcp-impl@grc.nasa.gov  Wed Apr 17 14:27:29 2002
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Date: Wed, 17 Apr 2002 11:18:16 -0700
From: Rick Jones <rick_jones2@hp.com>
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I thought that the rise in the web pretty much obsoleted any stack that
still used a linear search.

rick jones
-- 
Wisdom Teeth are impacted, people are affected by the effects of events.
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to raj in cup.hp.com  but NOT BOTH...


From owner-tcp-impl@grc.nasa.gov  Wed Apr 17 14:39:21 2002
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	(envelope-from rizzo)
Date: Wed, 17 Apr 2002 11:29:24 -0700
From: Luigi Rizzo <rizzo@icir.org>
To: "Vishnepolsky, Oleg" <ovishnepolsky@doubleclick.net>
Cc: "'tcp-impl@grc.nasa.gov'" <tcp-impl@grc.nasa.gov>
Subject: Re: linear search of TCP control blocks on demultiplexing of an incom ing IP datagram
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On Wed, Apr 17, 2002 at 02:06:10PM -0400, Vishnepolsky, Oleg wrote:
...
> used linear search except I used a one control block cache lookup since most
> of the TCP packets come in "trains".

well, this seems to be more a feature of your test environment than
a general property. It may be true on a workstation-type of system,
where there are only very few active connections at once (but then
the PCB lookup load is probably negligible compared to the cycles
spent doing DCT and XML parsing and bytecode interpretation), but
certainly not in a server-type of system with hundreds of active
sessions.

	cheers
	luigi
-----------------------------------+-------------------------------------
  Luigi RIZZO, luigi@iet.unipi.it  . Dip. di Ing. dell'Informazione
  http://www.iet.unipi.it/~luigi/  . Universita` di Pisa
  TEL/FAX: +39-050-568.533/522     . via Diotisalvi 2, 56126 PISA (Italy)
  Mobile   +39-347-0373137
-----------------------------------+-------------------------------------


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To: "Vishnepolsky, Oleg" <ovishnepolsky@doubleclick.net>
Cc: "'tcp-impl@grc.nasa.gov'" <tcp-impl@grc.nasa.gov>
Subject: Re: linear search of TCP control blocks on demultiplexing of an incoming 
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"Vishnepolsky, Oleg" wrote:

> Which TCP implementations do a hash lookup ? I know that most BSD
> derivatives do a linear search, except for the freebsd stack which does a
> hash. What about MS stacks ? My stacks (OS/2, FlexOS) being BSD derivatives
> used linear search except I used a one control block cache lookup since most
> of the TCP packets come in "trains". I had a 70% hit ration in my
> experiments.

Actually the NetBSD implementation another BSD derivative also hashes the five
tuple, i'm sure
even the Linux implementation does.

Murali

>
> Is there a study/comparison of various TCP stacks re this and many other
> characteristics ? I am aware of external TCP fingerprinting  but that does
> not reveal the internals that much. Any help will be appreciated.
> Oleg Vishnepolsky



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To: ovishnepolsky@doubleclick.net, tcp-impl@grc.nasa.gov
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> From: "Vishnepolsky, Oleg" <ovishnepolsky@doubleclick.net>
> Subject: linear search of TCP control blocks on demultiplexing of an incom
> 	ing IP datagram
> Date: Wed, 17 Apr 2002 14:06:10 -0400
>
> Which TCP implementations do a hash lookup ? I know that most BSD
> derivatives do a linear search, except for the freebsd stack which does a
> hash. What about MS stacks ? My stacks (OS/2, FlexOS) being BSD derivatives
...

BSD/OS has done hashed pcb lookups for over 6 years now (since BSD/OS 3.0).

		-David Borman


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Subject: Re: linear search of TCP control blocks on demultiplexing of an incoming
To: mbashyam@cisco.com (Murali Bashyam)
Date: Wed, 17 Apr 2002 21:18:33 +0100 (BST)
Cc: ovishnepolsky@doubleclick.net (Vishnepolsky Oleg),
        tcp-impl@grc.nasa.gov ('tcp-impl@grc.nasa.gov')
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> Actually the NetBSD implementation another BSD derivative also hashes the five
> tuple, i'm sure
> even the Linux implementation does.

Linux has had hashed lookups since before 1.0. I don't believe it ever
had straight lists in any incarnation. The size and sophistication of the
hash has increased massively over time, as things like big porn sites
pretty much demand nowdays.

Alan


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Date: Thu, 18 Apr 2002 07:17:26 -0400 (EDT)
From: Brian Levine <brian@cs.umass.edu>
Subject: Networked Group Communication 2002 (Call for Papers)
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My apologies if you receive multiple copies of this CFP.

-------------------------------------------------------------


 Fourth International Workshop on Networked Group Communication

			 October 23-25, 2002
		      Boston, Massachusetts, USA
		    Organized in cooperation with
		       ACM SIGCOMM and COST 264

		  http://signl.cs.umass.edu/ngc2002

   The aim of NGC is to allow researchers and practitioners to present
   the design and implementation techniques for networked group
   communication. The focus of the workshop is on peer-to-peer,
   multicast, and networked group communication, ranging from the link
   layer, through routing, and reliability and traffic control, right
   up to session and application level control mechanisms. This
   workshop is the fourth of this international event. The first
   workshop was in Pisa, Italy, in November 1999; the second was in
   Stanford, USA, in November 2000; the third was in London, UK,
   in November 2001.

   We wish to distinguish NGC as a forum for novel and creative
   research projects and discussions on the future of networked group
   communication in academia and industry. To this end, NGC invites
   you to submit five-page extended abstracts. Authors of accepted
   papers will be invited to present at the workshop and publish
   full-length versions of their papers in the workshop
   proceedings. The extended abstract abstract should represent the
   paper in "short form."  Authors should include full references,
   figures and significant results when available. The submissions
   will be judged on significance, originality, clarity, relevance,
   and correctness.

   The conference will be held at Holiday Inn, Brookline in Boston,
   MA.  It will start with two half-day tutorials on October 23,
   2002. The technical program will include a keynote and invited
   talks on October 24-25, 2002. Depending on interest level, and
   suitable proposed topics, there may also be a panel discussion as
   well as a poster session. Authors are invited to submit papers on
   any issue related to networked group communication, including:

     * peer-to-peer applications
     * applications and services enabled through multicast
     * wireless and mobile communication
     * multiplayer games
     * measurement studies
     * content distribution
     * network security
     * application layer multicast
     * economic models
     * novel group communication architectures
     * routing, naming, address allocation
     * group and session management techniques
     * QoS and network engineering
     * scalability: overheads, stability, analysis, experiments
     * adaption and congestion control for group communication
     * heterogeneous group communication
     * reliable and semi-reliable protocols

Important Dates:

   Paper Registration and Submission: May 17, 2002
   Notification: July 24, 2002
   Camera Ready copy: August 15, 2002
   Conference Dates: October 23-25, 2002

Committee:

   Technical Co-Chairs:
   Mostafa Ammar (Georgia Tech)
   Brian Neil Levine (University of Massachusetts Amherst)

   General Chair:
   John Byers (Boston University)

Technical Committee:

   Kevin Almeroth          UC Santa Barbara
   Samrat Bhattacharjee    Univ. Maryland
   Supratik Bhattacharyya  Sprint Advanced Technology Labs
   Ernst Biersak           Institut Eurecom
   John Byers              Boston University
   Jon Crowcroft           University of Cambridge
   Christophe Diot         Sprint Advanced Technology Labs
   Constantinos Dovrolis   University of Delaware
   Jordi Domingo-Pascual   Universitat Politecnica de Catalunya
   Derek Eager             University of Saskatchewan
   Wolfgang Effelsberg     University of Mannheim
   Serge Fdida             Laboratoire LIP6-CNRS
   Lixin Gao               University of Massachusetts
   J.J. Garcia-Luna-Aceves University of California, Santa Cruz
   Mark Handley            ICSI Center for Internet Research
   Markus Hoffman          Lucent Technologies
   David Hutchison         Lancaster University
   Sugih Jamin             University of Michigan
   Jim Kurose              University of Massachus
   Guy Leduc               universite de Liege
   Jorg Liebeherr          University of Virginia
   Peter Parnes            Lulea University of Technology
   Sanjoy Paul             Lucent Technologies
   Christos Papadopoulos   Univerity of Southern California
   Colin Perkins           Information Sciences Institute
   Luigi Rizzo             ICSI Center for Internet Research
   Elizabeth Royer         University of California, Santa Barbara
   Dan Rubenstein          Columbia University
   Thierry Turletti        INRIA-Sophia Antipolis
   Clay Shields            Georgetown University
   Burkhard Stiller	   ETH Zuerich
   Ellen Zegura            Georgia Tech







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Date: Fri, 19 Apr 2002 16:58:28 +0200
From: Lanc2002 <lanc2002@uib.es>
Subject: Call for papers Lanc2002
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Dear Friends:
Attached you will find the last version of call for papers in .doc, .pdf,
and .txt
formats.

Best regards.


-----------------------------
Organizing Committee Lanc2002
Facultad Regional de Santa Fe,
Universidad Tecnológica Nacional
September 9-11,2002
Santa Fe, Argentina
-----------------------------

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SUBMISSION DEADLINE EXTENDED UNTIL APRIL 28

Latin America Networking Conference 2002

Toward the Internet Next Generation

IFIP - TC6 and ACM _ SIGCOMM

Santa Fe, Argentina
Facultad Regional de Santa Fe, Universidad Tecnol=F3gica Nacional
September 9 - 11, 2002

http://www.uib.es/congres/lanc2002

Sponsored by
IFIP TC6 and ACM SIGCOMM

Organized by
SADIO, Sociedad Argentina de Inform=E1tica e Investigaci=F3n Operativa

Organizing Committee
Carlos Giorgetti, U. Tecnol=F3gica Nacional, Facultad Regional Santa Fe =
(AR)
Javier Ouret, Pontificia U. Cat=F3lica Argentina (AR)

Programme committee chair
Ramon Puigjaner, U. de les Illes Balears (ES)

Programme committee members
Benjam=EDn Bar=E1n, U. Nacional de Asunci=F3n (PY)
Abdelmalek Benzekri, U. Paul Sabatier (FR)
Raouf Boutaba, U. Waterloo (CA)
Augusto Casaca, INESC (PT)
Lyman Chapin, Nexthop (US)
Patricia Corbo, UORT (UY)
Javier D=EDaz, U. Nacional de La Plata (AR)
Christophe Diot, Sprint (US)
Yesid Donoso, U. del Norte (CO)
Julio Escobar, Centauri Consultor=EDa Tecnol=F3gica (PA)
G=FCnter Haring, Wien U. (AT)
Germinal Isern, U. Central de Venezuela (VE)
Farouk Kamoun, ENSI (TU)
Koos Koen, U. Wittwatersrand (ZA)
Dipak Khakhar, Lund U. (SE)
Jacques Labetoulle, IAAI (FR)
Jose Neuman de Sousa, U. Federal de Ceara (BR)
Luis Olsina, U. Nacional de La Pampa (AR)
Craig Partirdge, BBN (US)
Jos=E9 M. Piquer, U. de Chile (CL)
Guy Pujolle, LIP6 (FR)
Daniela Rosu, IBM (US)
Bartomeu Serra, U. de les Illes Balears (ES)
Otto Spaniol, RWTH (DE)
Yutaka Takahashi, Kyoto U. (JP)
Liane Tarouco, U. Federal de Rio Grande do Sur (BR)

Publicity Committee Chair
Bartomeu Serra, U. de les Illes Balears (ES)
Tomeu.Serra@uib.es

Latin America Networking 2002 Conference
Latin America Networking 2002 Conference will provide an international =
technical forum for experts from=20
industry and academia from everywhere in the world but especially from =
the Latin America countries to exchange=20
ideas and present results of ongoing research in networking mainly =
oriented to solve the Latin America=20
networking problems.

Topics

They include but are not restricted to:
-	Access Networks
-	Active Networks
-	Control and Optimisation of Communication Systems
-	High Performance Networking and Protocols
-	Internet Services and Applications
-	Intelligent Networks
-	Internet/Intranet
-	LAN, WAN Global Network Interconnection
-	Low Earth Orbit Satellite Communication Systems
-	Multicast
-	Network Design Problems in Gigabit
-	Network Operations and Management=20
-	Network Reliability, Availability and Survivability
-	Networks for Sparse Populations
-	Object Orientation
-	Optical Communications=20
-	Performance Evaluation of Telecommunication Systems
-	Photonic Networks
-	Quality of Service
-	Routing Design
-	Satellite and Space Communications=20
-	Service Provider Interworking
-	Services for Sparse Populations
-	Signalling
-	Switching and Routing
-	Switching Design=20
-	Tariffying
-	Terabit Networks
-	Terrestrial Radio Systems=20
-	Traffic and Congestion Control
-	Traffic Models and Measurements
-	Video Coding and Distribution
-	Wireless Networks
-	Wireless and Mobile Communications=20

Papers should cover not only general network solutions but also =
solutions oriented to the specific network=20
problems of this region of the world.

KEY DATES=20
* April 28, 2002	Deadline for submitting tutorial proposals=09
* April 28, 2002 	Deadline for submitting papers 	=09
* June 15, 2002	Notification of acceptance of papers
* July 15, 2002	Papers received in camera ready form
* September 7-8, 2002 	Tutorials
* September 9-11, 2002 	Latin American Networking 2002 Conference

SUBMISSION OF PAPERS
Paper should be uploaded electronically to the web site of the =
conference: http://www.uib.es/congres/lanc2002,=20
preferably in .pdf format. For any doubt, contact lanc2002@uib.es .

Papers are invited on the conference theme and related topics. Authors =
must state that their paper have neither=20
been published before nor currently being submitted elsewhere.
Full papers should:
-	be no longer than 15 single spaced pages, including tables, diagrams =
and pictures using a font size of 12=20
points or larger, or=20
-	follow the styles shown at the conference URL: =
http://www.uib.es/congres/lanc2002.=20
The first page must contain an abstract of about 150 words, name and =
affiliation of author(s) as well as the lead=20
author's postal address, telephone number, fax number and e-mail.
Accepted papers will be included in the conference proceedings and will =
be distributed to the attendees at the=20
conference.
The language of the conference is English and papers must be in this =
language.

TUTORIALS=20
We solicit proposals for half/full day tutorial courses outlining the =
subject area, describing level, goal and=20
orientation and a short biography of the speaker(s).
Proposals should be submitted by email to the chairman of the Programme =
Committee

Ramon Puigjamer
Email: putxi@uib.es=20

MINI CONFERENCES, WORKSHOPS AND SPECIAL SESSIONS.
Proposals should be sent to the chairman of the Program Committee =
(putxi@uib.es) with indication of the aims,=20
scope, and call for papers of the event and a short CV of the =
organizer(s) before March 1, 2002.
Specific call for papers will be provided.
Till now two special sessions have been suggested:
-	Poster session for student works coming from Latin American =
Universities
-	On-going networking research session


--Boundary_(ID_sbfO582a/exUUqY+G3cahw)--


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To: tcp-impl@lerc.nasa.gov
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[Many appologies if you receive this announcement more than once]

            *************************************************
            ******  Preliminary CALL FOR PAPERS     *********
            *************************************************
            *               IEEE INFOCOM 2003               *
            *   The Conference on Computer Communications   *
            *                                               *
            *    March 30 - April 3, 2003, San Francisco    *
            *                                               *
            *    The 22nd Annual Joint Conference of the    *
            *   IEEE Computer and Communications Societies  *
            *                                               *
            *       http://www.ieee-infocom.org/2003        *
            *************************************************

SCOPE
=====

The major conference on computer communications and networking is
celebrating its 22nd anniversary in San Francisco, California,
during the week of March 30 - April 3, 2003. The conference will 
bring researchers and practitioners of every aspect of data
communications and networks together to present the most
up-to-date results and achievements in the field.

Original papers are invited on recent advances in computer
communications and networking. Topics of interest include,
but are not limited to, the following:

        * Ad hoc & sensor networks
        * Addressing & location management
        * Admission control
        * Cellular networks
        * Content distribution & web caching
        * Flow & congestion control
        * Multicast
        * Network applications & services
        * Network architectures
        * Network control by pricing
        * Network design & planning
        * Network management & control
        * Optical networks
        * Power control
        * Pricing & billing mechanisms
        * Quality of service
        * Queueing/performance evaluation
        * Resource allocation
        * Routing algorithms
        * Scheduling & buffer management
        * Security & denial of service
        * Switches & switching
        * Topology inference 
        * Traffic & performance measurement
        * Traffic engineering
        * Web performance
        * Wireless LANs

SCHEDULE (STRICTLY ENFORCED)
        Full paper due                   July 10, 2002
        Notification of acceptance       October 25, 2002
        Final version due                December 19, 2002

CONFERENCE SCHEDULE
        Tutorials                        March 30-31, 2003
        Conference                       April 1-3, 2003

INFORMATION ON:
    * Submission instructions        * Program and registration
    * Tutorials                      * Workshops
    * Local arrangements             * Student and travel grants

    appears at http://www.ieee-infocom.org/2003 


For general information please contact the Genaral Chair, Fred Bauer
(fredbauer@ieee.org)

PROGRAM COMMITTEE CO-CHAIRS
===========================
Jim Roberts, France Telecom R&D, France (james.roberts@francetelecom.com)
Ness Shroff, Purdue University, USA (shroff@ecn.purdue.edu)




From owner-tcp-impl@grc.nasa.gov  Sat Apr 20 11:38:34 2002
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Date: Sat, 20 Apr 2002 10:44:38 -0400
To: christen@csee.usf.edu
From: Ken Christensen <christen@csee.usf.edu>
Subject: Call for Papers - Workshop on High-Speed Local Networks (HSLN)
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                            CALL FOR PAPERS
              Workshop on High-Speed Local Networks (HSLN)
                   as part of the IEEE LCN conference
                      http://www.hcs.ufl.edu/hsln
                        http://www.ieeelcn.org

                          November 6 - 8, 2002
                   Embassy Suites USF, Tampa, Florida

Important dates and contact:
----------------------------
   Paper submission: June 10, 2002
   Notification of acceptance: July 15, 2002
   Camera-ready copy due: August 16, 2002
   General Chair: Alan D. George (george@hcs.ufl.edu)

General Information:
--------------------
The High-Speed Local Networks (HSLN) workshop, within the 27th IEEE
Conference on Local Computer Networks (LCN), focuses on the design,
analysis, implementation, and exploitation of new concepts, techno-
logies, and applications related to high-performance networks on a
local scale.  This workshop will bring together networking researchers,
engineers, and practitioners from across the spectrum of high-speed
local networks, with participants from industry, academia, and
government.  Original papers that present research results, case
studies, technology development or deployment experience, work in
progress, etc. are solicited, as are survey articles.

Specific areas of interest include (but are not limited to):
- High-speed LANs (e.g. Gigabit Ethernet, 10 Gigabit Ethernet)
- System-area networks (e.g. SCI, Myrinet, ServerNet)
- Storage-area networks (e.g. Fibre Channel) and I/O interconnects
- High-speed networks in embedded systems (e.g. avionics, space systems)
- Protocols, services, and topologies for high-speed local networks
- Routing and switch architectures for high-speed local networks
- Quality of Service (QoS) in high-speed local networks
- Performance analysis of high-speed local networks and systems
- Modeling and simulation of high-speed local networks
- Middleware for high-speed local network communication
- Applications for high-speed local networks (e.g. video on demand)

Paper Submission Instructions:
------------------------------
Authors are invited to submit papers of up to ten camera-ready pages,
in PDF or Postscript format, for presentation at the workshop and
publication in the conference proceedings.  Papers should be
submitted by email to the workshop at hsln@hcs.ufl.edu on or before
June 10, 2002.  Alternatively, send five hard copies via postal mail
to:

   Dr. Alan D. George
   HSLN General Chair
   Department of Electrical and Computer Engineering
   University of Florida
   PO Box 116200, 327 Larsen Hall
   Gainesville, FL 32611-6200

HSLN Organizing Committee:
--------------------------
Workshop Chair:      Industry Chair:               Program Chair:
A.D. George          J.L. Meier                    K.J. Christensen
ECE Department       Advanced Technology Center    CSE Department
Univ of Florida      Rockwell Collins, Inc.        Univ of South Florida
george@hcs.ufl.edu   jlmeier@rockwellcollins.com   christen@csee.usf.edu

HSLN Program Committee:
-----------------------

Jay Bragg (awbragg@yahoo.com)
Consultant

Ron Brightwell (bright@cs.sandia.gov)
Sandia National Labs, NM

Wayne Chang (wchang@arl.army.mil)
Army Research Laboratory

Helen Chen (hycsw@california.sandia.gov)
Sandia National Labs, CA

Patrick W. Dowd (dowd@lts.ncsc.mil)
University of Maryland at College Park and U.S. Department of Defense
College Park, MD

Mike Foster (michael.s.foster@boeing.com)
Boeing Corporation

Michael A. Hoard (hoardm@us.ibm.com)
IBM
Beaverton, OR

Cynthia S. Hood (hood@iit.edu)
Illinois Institute of Technology
Chicago, IL

Anestis Karasaridis (karasaridis@att.com)
Network Design and Performance Analysis Dept.
AT&T Labs, Middletown, NJ

Fred Kuhns (fredk@arl.wustl.edu)
Washington University
St. Louis, MO

Michael McKee (mckee026@umn.edu)
University of Minnesota, Rochester
Rochester, MN

Knut Omang (knuto@fast.no)
University of Oslo
Oslo, Norway

Sarp Oral (oral@hcs.ufl.edu)
University of Florida
Gainesville, FL

D. K. Panda (panda@cis.ohio-state.edu)
Ohio State University
Columbus, OH

Anthony Skjellum (tony@MPI-SoftTech.Com)
Mississippi State University
Starkville, MS

Norm Strole (ncstrole@us.ibm.com)
IBM
Research Triangle Park, NC

Rollins Turner (rturner@paradyne.com)
Paradyne Corporation
Largo, FL

William White (wwhite@siue.edu)
Southern Illinois University
Edwardsville, IL

Tim Wilcox (tim.wilcox@dolphinics.com)
Technical Director, Dolphin Interconnect

---




From owner-tcp-impl@grc.nasa.gov  Mon Apr 22 01:09:11 2002
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From: "Udaya kumar" <uday@qpackets.com>
To: <tcp-impl@grc.nasa.gov>
Subject: Simultaneous Open - Reg
Date: Mon, 22 Apr 2002 10:13:26 +0530
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------=_NextPart_000_00E9_01C1E9E6.57E04530
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	charset="iso-8859-1"
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Hi

    I have a query regarding simultaneous open in TCP.

    The response to a SYN segment in the SYN_SENT state is to send a =
SYN,ACK carrying the old sequence number(i.e seq. no of the SYN segment =
sent earlier). Ref -> rfc793 &&  rfc1122. If the response is such,  then =
the SYN,ACK segment would be dropped at the receving side due to =
sequence number check. Hence connection cannot be established.


In our imlpementation it is noted that the TCP stack sends a simple ACK =
segment with the next sequence number instead of the SYN,ACK mentioned =
above. This simple ACK with incremented seq. number would definetly be =
accepted at the other end and the two sides will go to established =
state.

I request for a clarification in this regard as to which approach is =
correct and is there any reference to this issue in the rfcs other than =
793 and 1122.

thanks
uday
=20

------=_NextPart_000_00E9_01C1E9E6.57E04530
Content-Type: text/html;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META content=3D"MSHTML 5.00.2919.6307" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#c0dcc0>
<DIV><FONT face=3DArial size=3D2>Hi</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp;&nbsp; I have a query =
regarding=20
simultaneous open in TCP.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp;&nbsp; The response to a =
SYN segment in=20
the SYN_SENT state is to send a SYN,ACK carrying&nbsp;the old sequence=20
number(i.e seq. no of the SYN segment sent earlier). Ref -&gt; rfc793=20
&amp;&amp;&nbsp; rfc1122. </FONT><FONT face=3DArial size=3D2>If the =
response is=20
such,  then the SYN,ACK segment would be dropped at the receving side =
due to=20
sequence number check. Hence connection cannot be =
established.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>In our imlpementation&nbsp;it is =
noted&nbsp;that=20
the TCP stack sends a simple ACK segment with the next sequence number =
instead=20
of the SYN,ACK mentioned above. This simple ACK with incremented seq. =
number=20
would definetly be accepted at the other end and the two sides will go =
to=20
established state.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I request for a clarification in this =
regard as to=20
which approach is correct and is there any reference to this issue in =
the rfcs=20
other than 793 and 1122.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>thanks</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>uday</FONT></DIV>
<DIV>&nbsp;</DIV></BODY></HTML>

------=_NextPart_000_00E9_01C1E9E6.57E04530--



From owner-tcp-impl@grc.nasa.gov  Mon Apr 22 03:29:18 2002
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Date: Mon, 22 Apr 2002 00:20:06 -0700
From: Neil Spring <nspring@cs.washington.edu>
To: tcp-impl@grc.nasa.gov
Subject: Re: Simultaneous Open - Reg
Message-ID: <20020422071954.GA8098@cs.washington.edu>
References: <00ec01c1e9b8$52938b60$fc0f10ac@roc.com>
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On Mon, Apr 22, 2002 at 10:13:26AM +0530, Udaya kumar wrote:
>     The response to a SYN segment in the SYN_SENT state
> is to send a SYN,ACK carrying the old sequence number(i.e
> seq. no of the SYN segment sent earlier). Ref -> rfc793 &&
> rfc1122. If the response is such,  then the SYN,ACK segment
> would be dropped at the receving side due to sequence
> number check. Hence connection cannot be established.

which sequence number check?  it seems like a receiver
that would discard the syn/ack packet it needs to make
progress is not correct.  The syn/ack packet looks just
like a retransmitted syn, with the extra ack information,
so I'm surprised it would be dropped.

The only relevant sequence number check I found in linux:
  if (th->syn && !before(TCP_SKB_CB(skb)->seq, tp->rcv_nxt)) {
    tcp_reset(sk);
    return 1;
  }
seems like it should let such a syn/ack (syn as in the
previous packet, is before the next byte expected) through,
unless I misread the code.

-neil


From owner-tcp-impl@grc.nasa.gov  Mon Apr 22 14:08:41 2002
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From: Bob Braden <braden@ISI.EDU>
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Date: Mon, 22 Apr 2002 17:53:06 GMT
Message-Id: <200204221753.RAA13275@gra.isi.edu>
To: tcp-impl@grc.nasa.gov, uday@qpackets.com
Subject: Re: Simultaneous Open - Reg
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  *> From owner-tcp-impl@grc.nasa.gov  Sun Apr 21 22:07:54 2002
  *> From: "Udaya kumar" <uday@qpackets.com>
  *> To: <tcp-impl@grc.nasa.gov>
  *> Subject: Simultaneous Open - Reg
  *> Date: Mon, 22 Apr 2002 10:13:26 +0530
  *> MIME-Version: 1.0
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  *> X-MSMail-Priority: Normal
  *> X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600
  *> X-AntiVirus: scanned by AMaViS 0.2.1
  *> 
  *> Hi
  *> 
  *>     I have a query regarding simultaneous open in TCP.
  *> 
  *>     The response to a SYN segment in the SYN_SENT state is to send a SYN,ACK carrying the old sequence number(i.e seq. no of the SYN segment sent earlier). Ref -> rfc793 &&  rfc1122. If the response is such,  then the SYN,ACK segment would be dropped at the receving side due to sequence number check. Hence connection cannot be established.

No.  It will be accepted and the "receiving" side will go from SYN_SENT
state to ESTABLISHED.

Bob Braden


From owner-tcp-impl@grc.nasa.gov  Mon Apr 22 19:14:40 2002
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From: Bikram Bakshi <BBakshi@bionetrix.com>
To: Bikram Bakshi <BBakshi@bionetrix.com>
Subject: Call For Papers: LCN  2002 - The 27th Annual IEEE Local Computer 
	Networks Conference
Date: Mon, 22 Apr 2002 18:52:58 -0400
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------------------------------------------------------
 Our apologies if you have received multiple copies.
------------------------------------------------------

                             LCN 2002
                 The 27th Annual IEEE Conference on
                   Local Computer Networks (LCN)
                       http://www.ieeelcn.org

                          Tampa, Florida
                        November 6-8, 2002

               Sponsored by the IEEE Computer Society
                with support from the University of 
               South Florida College of Engineering.

                         CALL FOR PAPERS

The IEEE LCN conference is the premier conference on leading
edge and practical computer networking. We encourage
you to submit original papers describing research results or
practical solutions. Paper topics include, but are not limited
to:

Personal Area Networks           High Speed Networks
Wearable Networks                Network Management
Wireless Networks                Network Security
Always On / Always Connected     Network Reliability
Mobility Management              Network to the Home
Location-dependant services      QOS/Congestion Control
Local Area Networks              Adaptive Applications
Home Networks                    Anything-over-IP
Small Office Networks            IP-over-Anything
Storage Area Networks            Performance Eval./Measurements
Optical Networks                 Protocol Design and Validation

Authors are invited to submit full or short papers for
presentation at the conference. Full papers (no more than 10
camera-ready pages) should present novel perspectives within
the general scope of the conference. Short papers are an
opportunity to present preliminary or interim results and are
limited to 2 camera-ready pages in length. A best paper will
be selected based on the quality of research and results, as
well as on the quality of presentation by the primary author.
Several student travel scholarships may be available courtesy
of the LCN corporate supporters.  All papers must include title,
complete contact information for all authors, abstract, and
keywords on the cover page. The correspondence author must be
clearly identified.

PAPER SUBMISSION:
Papers must be submitted electronically. Manuscript submission
instructions can be found at http://lcn2002.cs.bonn.edu/.
Authors for whom electronic submission presents a severe
problem should contact the program chair or co-chair:

Bikram Bakshi                    Prof. Dr. Burkhard Stiller
BioNetrix Systems Inc.           ETH Zurich, TIK
1953 Gallows Road                Gloriastrasse 35
Vienna, VA 22182                 CH-8092 Zurich, Switzerland
E-mail: bbakshi@bionetrix.com    E-mail: stiller@tik.ee.ethz.ch

IMPORTANT DATES:
Paper submission deadline: May 17, 2002
Notification of acceptance: July 15, 2002
Camera-ready paper due: August 16, 2002
Author registration deadline: August 16, 2002

FOR MORE INFORMATION:
Please visit the conference website http://www.ieeelcn.org


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Date: Fri, 19 Apr 2002 16:58:28 +0200
From: Lanc2002 <lanc2002@uib.es>
Subject: Call for papers Lanc2002
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Dear Friends:
Attached you will find the last version of call for papers in .doc, .pdf,
and .txt
formats.

Best regards.


-----------------------------
Organizing Committee Lanc2002
Facultad Regional de Santa Fe,
Universidad Tecnológica Nacional
September 9-11,2002
Santa Fe, Argentina
-----------------------------

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--Boundary_(ID_M+dsj/a8rWwCBYs6H/SpBQ)
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SUBMISSION DEADLINE EXTENDED UNTIL APRIL 28

Latin America Networking Conference 2002

Toward the Internet Next Generation

IFIP - TC6 and ACM _ SIGCOMM

Santa Fe, Argentina
Facultad Regional de Santa Fe, Universidad Tecnol=F3gica Nacional
September 9 - 11, 2002

http://www.uib.es/congres/lanc2002

Sponsored by
IFIP TC6 and ACM SIGCOMM

Organized by
SADIO, Sociedad Argentina de Inform=E1tica e Investigaci=F3n Operativa

Organizing Committee
Carlos Giorgetti, U. Tecnol=F3gica Nacional, Facultad Regional Santa Fe =
(AR)
Javier Ouret, Pontificia U. Cat=F3lica Argentina (AR)

Programme committee chair
Ramon Puigjaner, U. de les Illes Balears (ES)

Programme committee members
Benjam=EDn Bar=E1n, U. Nacional de Asunci=F3n (PY)
Abdelmalek Benzekri, U. Paul Sabatier (FR)
Raouf Boutaba, U. Waterloo (CA)
Augusto Casaca, INESC (PT)
Lyman Chapin, Nexthop (US)
Patricia Corbo, UORT (UY)
Javier D=EDaz, U. Nacional de La Plata (AR)
Christophe Diot, Sprint (US)
Yesid Donoso, U. del Norte (CO)
Julio Escobar, Centauri Consultor=EDa Tecnol=F3gica (PA)
G=FCnter Haring, Wien U. (AT)
Germinal Isern, U. Central de Venezuela (VE)
Farouk Kamoun, ENSI (TU)
Koos Koen, U. Wittwatersrand (ZA)
Dipak Khakhar, Lund U. (SE)
Jacques Labetoulle, IAAI (FR)
Jose Neuman de Sousa, U. Federal de Ceara (BR)
Luis Olsina, U. Nacional de La Pampa (AR)
Craig Partirdge, BBN (US)
Jos=E9 M. Piquer, U. de Chile (CL)
Guy Pujolle, LIP6 (FR)
Daniela Rosu, IBM (US)
Bartomeu Serra, U. de les Illes Balears (ES)
Otto Spaniol, RWTH (DE)
Yutaka Takahashi, Kyoto U. (JP)
Liane Tarouco, U. Federal de Rio Grande do Sur (BR)

Publicity Committee Chair
Bartomeu Serra, U. de les Illes Balears (ES)
Tomeu.Serra@uib.es

Latin America Networking 2002 Conference
Latin America Networking 2002 Conference will provide an international =
technical forum for experts from=20
industry and academia from everywhere in the world but especially from =
the Latin America countries to exchange=20
ideas and present results of ongoing research in networking mainly =
oriented to solve the Latin America=20
networking problems.

Topics

They include but are not restricted to:
-	Access Networks
-	Active Networks
-	Control and Optimisation of Communication Systems
-	High Performance Networking and Protocols
-	Internet Services and Applications
-	Intelligent Networks
-	Internet/Intranet
-	LAN, WAN Global Network Interconnection
-	Low Earth Orbit Satellite Communication Systems
-	Multicast
-	Network Design Problems in Gigabit
-	Network Operations and Management=20
-	Network Reliability, Availability and Survivability
-	Networks for Sparse Populations
-	Object Orientation
-	Optical Communications=20
-	Performance Evaluation of Telecommunication Systems
-	Photonic Networks
-	Quality of Service
-	Routing Design
-	Satellite and Space Communications=20
-	Service Provider Interworking
-	Services for Sparse Populations
-	Signalling
-	Switching and Routing
-	Switching Design=20
-	Tariffying
-	Terabit Networks
-	Terrestrial Radio Systems=20
-	Traffic and Congestion Control
-	Traffic Models and Measurements
-	Video Coding and Distribution
-	Wireless Networks
-	Wireless and Mobile Communications=20

Papers should cover not only general network solutions but also =
solutions oriented to the specific network=20
problems of this region of the world.

KEY DATES=20
* April 28, 2002	Deadline for submitting tutorial proposals=09
* April 28, 2002 	Deadline for submitting papers 	=09
* June 15, 2002	Notification of acceptance of papers
* July 15, 2002	Papers received in camera ready form
* September 7-8, 2002 	Tutorials
* September 9-11, 2002 	Latin American Networking 2002 Conference

SUBMISSION OF PAPERS
Paper should be uploaded electronically to the web site of the =
conference: http://www.uib.es/congres/lanc2002,=20
preferably in .pdf format. For any doubt, contact lanc2002@uib.es .

Papers are invited on the conference theme and related topics. Authors =
must state that their paper have neither=20
been published before nor currently being submitted elsewhere.
Full papers should:
-	be no longer than 15 single spaced pages, including tables, diagrams =
and pictures using a font size of 12=20
points or larger, or=20
-	follow the styles shown at the conference URL: =
http://www.uib.es/congres/lanc2002.=20
The first page must contain an abstract of about 150 words, name and =
affiliation of author(s) as well as the lead=20
author's postal address, telephone number, fax number and e-mail.
Accepted papers will be included in the conference proceedings and will =
be distributed to the attendees at the=20
conference.
The language of the conference is English and papers must be in this =
language.

TUTORIALS=20
We solicit proposals for half/full day tutorial courses outlining the =
subject area, describing level, goal and=20
orientation and a short biography of the speaker(s).
Proposals should be submitted by email to the chairman of the Programme =
Committee

Ramon Puigjamer
Email: putxi@uib.es=20

MINI CONFERENCES, WORKSHOPS AND SPECIAL SESSIONS.
Proposals should be sent to the chairman of the Program Committee =
(putxi@uib.es) with indication of the aims,=20
scope, and call for papers of the event and a short CV of the =
organizer(s) before March 1, 2002.
Specific call for papers will be provided.
Till now two special sessions have been suggested:
-	Poster session for student works coming from Latin American =
Universities
-	On-going networking research session


--Boundary_(ID_M+dsj/a8rWwCBYs6H/SpBQ)--



From owner-tcp-impl@grc.nasa.gov  Wed Apr 24 09:19:49 2002
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Subject: Update of smoothed RTT in case of retransmitted segments
From: Sebastian Zimmermann <S.Zimmermann@tu-harburg.de>
To: tcp-impl@lerc.nasa.gov
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Hello,

I need some help with the implementation of the smoothed RTT calculation
in TCP in case of retransmitted segments:

Assume that segment 9 is the one being timed. However, segment 8 is
lost, so an acknowledgement for segment 9 cannot be generated by the
receiver.
The sender detects a timeout for segment 8 and retransmits it. Karn's
algorithm only says that retransmitted segments may not be timed, but -
in this case - segment 9 never was retransmitted, so the timer is not
stopped. After the receiver receives the retransmitted segment 8, it
will ack segment 9.

The problem: the measured RTT is completely wrong, because it still
contains the retransmission of segment 8.

Since Karn's algorithm doesn't avoid this problem, which one does?

Thanks,
 Sebastian



From owner-tcp-impl@grc.nasa.gov  Wed Apr 24 13:15:31 2002
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        SIGCOMM-MEMBERS@acm.org, sigmetrics-bb@haven.epm.ornl.gov,
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From: Tom Chen <tchen@engr.smu.edu>
Subject: CFP: IP Operations and Management (IPOM 2002)
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        * Apologies if you receive multiple copies of this *


                        CALL FOR PAPERS

      2002 IEEE Workshop on IP Operations & Management (IPOM 2002)

                      Octiber 29-31, 2002
                       Dallas, Texas USA
              http://snoopy.seas.smu.edu/ipom2002/

           Sponsored by the IEEE Communications Society

The 2002 IEEE Workshop on IP Operations and Management will
be held in Dallas, Texas, near the "Telecom Corridor" constituted by
Nortel Networks, Ericsson, Alcatel, Nokia, Cisco Systems, and other
major industry leaders.  The workshop will include a day of
tutorials and two days of presentations on original research.
The purpose of the workshop is to share research, experiences, and ideas
among researchers, engineers, and service providers involved in
IP-oriented network management and operations.  As IP-based networks
continue to expand from traditional data services to new real-time
and multimedia services, they become more difficult to manage.
At the same time, their proper operation is more important to maintain
for business.  It is vital to find both theoretical and practical
solutions to address these challenges.

Original papers are invited on such topics as (but not limited to):

* Using SNMP to manage networks
* Web-based network management
* Operations of IP networks
* SNMP versus TMN-based approaches
* Integrated management of multilayer networks
* Management of IP over SONET/SDH or WDM networks
* Management of IP over ATM
* Network management platforms
* Management of QoS in IP networks
* Security management for IP networks
* Mobility management, eg, mobile IP
* Management of Voice over IP
* Accounting, tariffing, and billing
* Network monitoring and diagnostics
* Deployment of new IP services, eg, diffserv, multicast, IPv6, etc.
* CORBA/Java-based network management
* Distributed network management and mobile agents
* IP traffic modeling and management
* Network planning and dimensioning
* Policy driven networks
* Scalability issues
* Case studies and experiments

Instructions for Authors:

Full paper submissions should be submitted electronically to one of
the technical program co-chairs in postscript, PDF, or Microsoft Word
format.  Submissions should be limited to 5 pages (standard double-column
IEEE conference format).  An additional title page should contain the
title of the paper, the authors' name(s), affiliation, address, telephone
and fax numbers, and e-mail of the corresponding author.

Questions and submissions may be directed to either of the
technical program co-chairs:

Tom Chen                         Salah Aidarous
SMU, Dept of EE                  NEC America
PO Box 750338                    6555 N State Highway 161
Dallas, Texas 75275-0338 USA     Irving, Texas 75039 USA
Tel: +1 214 768 8541             Tel:  +1 214 262 3230
Fax: +1 214 768 3573             Fax:  +1 214 262 3225
Email: tchen@engr.smu.edu        Email: saidarous@necam.com

Important dates:

Deadline for submissions:   May 10, 2002
Authors notifications:      August 9, 2002
Final manuscripts due:      September 6, 2002

General chair:

G-S Kuo, National Chengchi University, Taiwan
Email: gskuo@ieee.org




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Date: Thu, 25 Apr 2002 04:34:58 +0800
From: "Geng-Sheng (G.S.) Kuo" <gskuo@ieee.nccu.edu.tw>
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bwBsAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAFgABAP//
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AAA=
--------------0E03FC87A085336DDD13C3D4--



From owner-tcp-impl@grc.nasa.gov  Thu Apr 25 10:33:22 2002
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Message-ID: <3028394DED16D6118EAE00508BE3BA98809AE3@lotis>
From: Tom Mchugh <Tom_Mchugh@inmarsat.com>
To: tcp-impl@lerc.nasa.gov
Subject: TcpGraph for windows (2.2.5)
Date: Thu, 25 Apr 2002 15:10:54 +0100
MIME-Version: 1.0
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Ouch sorry.
If anyone is interested, this is a wee .exe for reading dumps.
If it doesnt work, send me the trace. I'll try and fix it.
(be gentle - it's new)
http://apps.inmarsat.com/tom/tcpgraph.htm
TcpGraph ver 2.2.5   expires 2 June 2002:   tcpgraph225.zip
Contains:  exe,  legal.txt and an example trace file
Size:      <600kBytes
OS:        Windows
Registry alterations none
Run from:  anywhere

User Commands:
  F2: parse (a previously opened file)\n \
  F3: draw (a previously parsed file)\n \
  F4: step mode (a previously parsed file)\n \
  F5: step (a previously parsed file)\n \
  Ctrl-A: clear chart
  Ctrl-B: clear console
  Ctrl-C: stop
  Ctrl-O: goto options dialogue
  Click on the graph and:
  i: zoom in
  o: zoom out

regards
 tom_mchugh@inmarsat.com


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From owner-tcp-impl@grc.nasa.gov  Thu Apr 25 15:21:08 2002
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Message-ID: <E4AAC34FE3CF564D8AE89EB8AC333FD7031F650F@XMB03CRDGE>
From: "Bush, Stephen F (Research)" <bushsf@crd.ge.com>
To: "'ipgroup@sprintlabs.com'" <ipgroup@sprintlabs.com>,
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        "'salah@rss.dl.nec.com'" <salah@rss.dl.nec.com>,
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        "'stds-802-wpan@ieee.org'" <stds-802-wpan@ieee.org>,
        "'swim99@silo.csci.unt.edu'" <swim99@cs.unt.edu>,
        "'tccc@cosmos.cs.columbia.edu'" <tccc@cosmos.cs.columbia.edu>,
        "'tccc@ieee.org'" <tccc@ieee.org>, "'tcgn@ieee.org'" <tcgn@ieee.org>,
        "'tci-announce@computer.org'" <tci-announce@computer.org>,
        "'tcii@ain3.kyungpook.ac.kr'" <tcii@ain3.kyungpook.ac.kr>,
        "'tcp-impl@lerc.nasa.gov'" <tcp-impl@lerc.nasa.gov>,
        "'tcpsat@lerc.nasa.gov'" <tcpsat@lerc.nasa.gov>,
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Subject: CFP: Complexity Theory and its Applications to Systems, Networks 
	and Information Assurance
Date: Thu, 25 Apr 2002 14:52:23 -0400
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Apologies for multiple copies...

Final Call for Papers - Systemics, Cybernetics and Informatics (SCI) 2002

	COMPLEXITY AND ALGORITHMIC INFORMATION THEORY WITH APPLICATION TO SYSTEMS, NETWORKS, 
						AND INFORMATION ASSURANCE

Amit B. Kulkarni and Stephen F. Bush (General Electric Global Research Center) are organizing 
a special session for SCI-2002 titled "Complexity Theory and its Applications to Systems, 
Networks and Information Assurance".

This session seeks to consolidate research in the areas of modeling, management, and security in
systems and networks with the large and growing body of work in Complexity and Algorithmic
Information 
Theory. The goal of this session is to compare traditional state-of-the-art methods with new advances

incorporating Complexity-based or Algorithmic Information methods and discuss their applications to
the 
health, management, and security of information systems. We invite you to submit papers to the
session 
on topics that can include, but are not limited to, the following:

EXAMPLE OF RELEVANT SESSION TOPICS:

*	Fundamental Relationships between Computation and Communication 
*	Controlled Access of Information, System Vulnerability Detection and Policy Enforcement
*	Quantification and Security Metrics
*	Self-Organization and Composition of System Solutions 
*	Applications of 'Physics Of Information' to Information Systems 
*	Case Studies Involving the Use of Complexity in Information Systems
*	Advances in Estimation and Measurement of Complexity
*	Novel Definitions of Complexity with Emphasis on Implementation Feasibility and Facilitation
	of System Health
*	Quantitative Comparison and Contrast of Complexity Estimators

If you are interested in contributing a paper to the session, please email kulkarni@crd.ge.com
<mailto:kulkarni@crd.ge.com> or bushsf@crd.ge.com <mailto:bushsf@crd.ge.com> the full paper or 
extended abstract by midnight June 30. [Note: new deadline]

The main conference call for papers follows:

THE 6th WORLD MULTI CONFERENCE ON SYSTEMICS, CYBERNETICS AND INFORMATICS SCI 2002

July 14 - 18, 2002

Orlando, Florida, USA
Sheraton World

http://www.iiis.org/sci2002/

Honorary Presidents: Bela Banathy, Stafford Beer and George Klir
Program Committee Chair: William Lesso
General Chair: Nagib Callaos
Organizing Committee Chair: Belkis Sanchez

Stephen F Bush (http://www.crd.ge.com/~bushsf/ftn)


From owner-tcp-impl@grc.nasa.gov  Fri Apr 26 04:12:02 2002
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From: Coordinador General <coordinador@citel.ispjae.edu.cu>
To: tcp-impl@lerc.nasa.gov
Subject: Congreso Internacional de Telemática, CITEL 2002
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="====================54535pbtbpb===="
Message-Id: <200204260037804.SM00348@>
Date: Fri, 26 Apr 2002 03:29:56 -0400
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--====================54535pbtbpb====
Content-Type: text/plain; charset=us-ascii

Dear colleague:

We are sending to you the Second International Announcement of the Second International Congress of Telematic to be held in Havana, CUBA next month of November with the central topic "The role of Telematics in Distance Education and in the Computerization of the Society". Several activities of special importance and relevancy are being planned during the Congress.

We hope this information may be of your personal interest and we would like to thank you if you might forward and advertized it among friends you may consider of interest .

Willing to clarify any doubt or solicitude of information you may need, receive warm regards from Cuba.

Sincerely

Organizing Committee
Second International Congress of Telematic

PD: Your name was recommended as a person interested in the proposed topics, if you don't want to receive any further information in this matter , please, let us know by doing reply to this message with the note: I AM NOT INTEREST IN FURTHER INFORMATION
---

Estimado Colega:

Adjunto le enviamos el Segundo Anuncio Internacional del II Congreso Internacional de Telemática a desarrollarse en la Habana el próximo mes de noviembre con tema central "El papel de la telemática en la educación a distancia y la informatización de la sociedad" donde se incluyen varias actividades centrales de especial importancia y trascendencia.

Esperando que esta comunicación sea de su interés personal, a tiempo que agradecemos cualquier reenvío que realice con las personas que considere oportuno.

Dispuestos a aclarar cualquier duda o solicitud de información, reciba un cálido saludo desde Cuba.

Atentamente

Comité Organizador
II Congreso Internacional de Telemática

PD: Su dirección fue recomendada como perteneciente a una persona interesada en los temas propuestos, si no desea recibir estas comunicaciones, por favor, hágaselo saber al Comité Organizador en la respuesta de este correo.
---

Alejandro G. Machado Cento
Coordinador General
II Congreso Internacional de Telemática

Teléfono: +53 (7) 2606279 /  2679880
Fax: +53 (7) 2671576
ICQ: 279233323
E-mail: coordinador@citel.ispjae.edu.cu
URL: http://www.ispjae.cu/eventos/citel
--====================54535pbtbpb====
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Date: Fri, 19 Apr 2002 16:58:28 +0200
From: Lanc2002 <lanc2002@uib.es>
Subject: Call for papers Lanc2002
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Dear Friends:
Attached you will find the last version of call for papers in .doc, .pdf,
and .txt
formats.

Best regards.


-----------------------------
Organizing Committee Lanc2002
Facultad Regional de Santa Fe,
Universidad Tecnológica Nacional
September 9-11,2002
Santa Fe, Argentina
-----------------------------

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SUBMISSION DEADLINE EXTENDED UNTIL APRIL 28

Latin America Networking Conference 2002

Toward the Internet Next Generation

IFIP - TC6 and ACM _ SIGCOMM

Santa Fe, Argentina
Facultad Regional de Santa Fe, Universidad Tecnol=F3gica Nacional
September 9 - 11, 2002

http://www.uib.es/congres/lanc2002

Sponsored by
IFIP TC6 and ACM SIGCOMM

Organized by
SADIO, Sociedad Argentina de Inform=E1tica e Investigaci=F3n Operativa

Organizing Committee
Carlos Giorgetti, U. Tecnol=F3gica Nacional, Facultad Regional Santa Fe =
(AR)
Javier Ouret, Pontificia U. Cat=F3lica Argentina (AR)

Programme committee chair
Ramon Puigjaner, U. de les Illes Balears (ES)

Programme committee members
Benjam=EDn Bar=E1n, U. Nacional de Asunci=F3n (PY)
Abdelmalek Benzekri, U. Paul Sabatier (FR)
Raouf Boutaba, U. Waterloo (CA)
Augusto Casaca, INESC (PT)
Lyman Chapin, Nexthop (US)
Patricia Corbo, UORT (UY)
Javier D=EDaz, U. Nacional de La Plata (AR)
Christophe Diot, Sprint (US)
Yesid Donoso, U. del Norte (CO)
Julio Escobar, Centauri Consultor=EDa Tecnol=F3gica (PA)
G=FCnter Haring, Wien U. (AT)
Germinal Isern, U. Central de Venezuela (VE)
Farouk Kamoun, ENSI (TU)
Koos Koen, U. Wittwatersrand (ZA)
Dipak Khakhar, Lund U. (SE)
Jacques Labetoulle, IAAI (FR)
Jose Neuman de Sousa, U. Federal de Ceara (BR)
Luis Olsina, U. Nacional de La Pampa (AR)
Craig Partirdge, BBN (US)
Jos=E9 M. Piquer, U. de Chile (CL)
Guy Pujolle, LIP6 (FR)
Daniela Rosu, IBM (US)
Bartomeu Serra, U. de les Illes Balears (ES)
Otto Spaniol, RWTH (DE)
Yutaka Takahashi, Kyoto U. (JP)
Liane Tarouco, U. Federal de Rio Grande do Sur (BR)

Publicity Committee Chair
Bartomeu Serra, U. de les Illes Balears (ES)
Tomeu.Serra@uib.es

Latin America Networking 2002 Conference
Latin America Networking 2002 Conference will provide an international =
technical forum for experts from=20
industry and academia from everywhere in the world but especially from =
the Latin America countries to exchange=20
ideas and present results of ongoing research in networking mainly =
oriented to solve the Latin America=20
networking problems.

Topics

They include but are not restricted to:
-	Access Networks
-	Active Networks
-	Control and Optimisation of Communication Systems
-	High Performance Networking and Protocols
-	Internet Services and Applications
-	Intelligent Networks
-	Internet/Intranet
-	LAN, WAN Global Network Interconnection
-	Low Earth Orbit Satellite Communication Systems
-	Multicast
-	Network Design Problems in Gigabit
-	Network Operations and Management=20
-	Network Reliability, Availability and Survivability
-	Networks for Sparse Populations
-	Object Orientation
-	Optical Communications=20
-	Performance Evaluation of Telecommunication Systems
-	Photonic Networks
-	Quality of Service
-	Routing Design
-	Satellite and Space Communications=20
-	Service Provider Interworking
-	Services for Sparse Populations
-	Signalling
-	Switching and Routing
-	Switching Design=20
-	Tariffying
-	Terabit Networks
-	Terrestrial Radio Systems=20
-	Traffic and Congestion Control
-	Traffic Models and Measurements
-	Video Coding and Distribution
-	Wireless Networks
-	Wireless and Mobile Communications=20

Papers should cover not only general network solutions but also =
solutions oriented to the specific network=20
problems of this region of the world.

KEY DATES=20
* April 28, 2002	Deadline for submitting tutorial proposals=09
* April 28, 2002 	Deadline for submitting papers 	=09
* June 15, 2002	Notification of acceptance of papers
* July 15, 2002	Papers received in camera ready form
* September 7-8, 2002 	Tutorials
* September 9-11, 2002 	Latin American Networking 2002 Conference

SUBMISSION OF PAPERS
Paper should be uploaded electronically to the web site of the =
conference: http://www.uib.es/congres/lanc2002,=20
preferably in .pdf format. For any doubt, contact lanc2002@uib.es .

Papers are invited on the conference theme and related topics. Authors =
must state that their paper have neither=20
been published before nor currently being submitted elsewhere.
Full papers should:
-	be no longer than 15 single spaced pages, including tables, diagrams =
and pictures using a font size of 12=20
points or larger, or=20
-	follow the styles shown at the conference URL: =
http://www.uib.es/congres/lanc2002.=20
The first page must contain an abstract of about 150 words, name and =
affiliation of author(s) as well as the lead=20
author's postal address, telephone number, fax number and e-mail.
Accepted papers will be included in the conference proceedings and will =
be distributed to the attendees at the=20
conference.
The language of the conference is English and papers must be in this =
language.

TUTORIALS=20
We solicit proposals for half/full day tutorial courses outlining the =
subject area, describing level, goal and=20
orientation and a short biography of the speaker(s).
Proposals should be submitted by email to the chairman of the Programme =
Committee

Ramon Puigjamer
Email: putxi@uib.es=20

MINI CONFERENCES, WORKSHOPS AND SPECIAL SESSIONS.
Proposals should be sent to the chairman of the Program Committee =
(putxi@uib.es) with indication of the aims,=20
scope, and call for papers of the event and a short CV of the =
organizer(s) before March 1, 2002.
Specific call for papers will be provided.
Till now two special sessions have been suggested:
-	Poster session for student works coming from Latin American =
Universities
-	On-going networking research session


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Date: Fri, 19 Apr 2002 16:58:28 +0200
From: Lanc2002 <lanc2002@uib.es>
Subject: Call for papers Lanc2002
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Dear Friends:
Attached you will find the last version of call for papers in .doc, .pdf,
and .txt
formats.

Best regards.


-----------------------------
Organizing Committee Lanc2002
Facultad Regional de Santa Fe,
Universidad Tecnológica Nacional
September 9-11,2002
Santa Fe, Argentina
-----------------------------

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--Boundary_(ID_M+dsj/a8rWwCBYs6H/SpBQ)
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SUBMISSION DEADLINE EXTENDED UNTIL APRIL 28

Latin America Networking Conference 2002

Toward the Internet Next Generation

IFIP - TC6 and ACM _ SIGCOMM

Santa Fe, Argentina
Facultad Regional de Santa Fe, Universidad Tecnol=F3gica Nacional
September 9 - 11, 2002

http://www.uib.es/congres/lanc2002

Sponsored by
IFIP TC6 and ACM SIGCOMM

Organized by
SADIO, Sociedad Argentina de Inform=E1tica e Investigaci=F3n Operativa

Organizing Committee
Carlos Giorgetti, U. Tecnol=F3gica Nacional, Facultad Regional Santa Fe =
(AR)
Javier Ouret, Pontificia U. Cat=F3lica Argentina (AR)

Programme committee chair
Ramon Puigjaner, U. de les Illes Balears (ES)

Programme committee members
Benjam=EDn Bar=E1n, U. Nacional de Asunci=F3n (PY)
Abdelmalek Benzekri, U. Paul Sabatier (FR)
Raouf Boutaba, U. Waterloo (CA)
Augusto Casaca, INESC (PT)
Lyman Chapin, Nexthop (US)
Patricia Corbo, UORT (UY)
Javier D=EDaz, U. Nacional de La Plata (AR)
Christophe Diot, Sprint (US)
Yesid Donoso, U. del Norte (CO)
Julio Escobar, Centauri Consultor=EDa Tecnol=F3gica (PA)
G=FCnter Haring, Wien U. (AT)
Germinal Isern, U. Central de Venezuela (VE)
Farouk Kamoun, ENSI (TU)
Koos Koen, U. Wittwatersrand (ZA)
Dipak Khakhar, Lund U. (SE)
Jacques Labetoulle, IAAI (FR)
Jose Neuman de Sousa, U. Federal de Ceara (BR)
Luis Olsina, U. Nacional de La Pampa (AR)
Craig Partirdge, BBN (US)
Jos=E9 M. Piquer, U. de Chile (CL)
Guy Pujolle, LIP6 (FR)
Daniela Rosu, IBM (US)
Bartomeu Serra, U. de les Illes Balears (ES)
Otto Spaniol, RWTH (DE)
Yutaka Takahashi, Kyoto U. (JP)
Liane Tarouco, U. Federal de Rio Grande do Sur (BR)

Publicity Committee Chair
Bartomeu Serra, U. de les Illes Balears (ES)
Tomeu.Serra@uib.es

Latin America Networking 2002 Conference
Latin America Networking 2002 Conference will provide an international =
technical forum for experts from=20
industry and academia from everywhere in the world but especially from =
the Latin America countries to exchange=20
ideas and present results of ongoing research in networking mainly =
oriented to solve the Latin America=20
networking problems.

Topics

They include but are not restricted to:
-	Access Networks
-	Active Networks
-	Control and Optimisation of Communication Systems
-	High Performance Networking and Protocols
-	Internet Services and Applications
-	Intelligent Networks
-	Internet/Intranet
-	LAN, WAN Global Network Interconnection
-	Low Earth Orbit Satellite Communication Systems
-	Multicast
-	Network Design Problems in Gigabit
-	Network Operations and Management=20
-	Network Reliability, Availability and Survivability
-	Networks for Sparse Populations
-	Object Orientation
-	Optical Communications=20
-	Performance Evaluation of Telecommunication Systems
-	Photonic Networks
-	Quality of Service
-	Routing Design
-	Satellite and Space Communications=20
-	Service Provider Interworking
-	Services for Sparse Populations
-	Signalling
-	Switching and Routing
-	Switching Design=20
-	Tariffying
-	Terabit Networks
-	Terrestrial Radio Systems=20
-	Traffic and Congestion Control
-	Traffic Models and Measurements
-	Video Coding and Distribution
-	Wireless Networks
-	Wireless and Mobile Communications=20

Papers should cover not only general network solutions but also =
solutions oriented to the specific network=20
problems of this region of the world.

KEY DATES=20
* April 28, 2002	Deadline for submitting tutorial proposals=09
* April 28, 2002 	Deadline for submitting papers 	=09
* June 15, 2002	Notification of acceptance of papers
* July 15, 2002	Papers received in camera ready form
* September 7-8, 2002 	Tutorials
* September 9-11, 2002 	Latin American Networking 2002 Conference

SUBMISSION OF PAPERS
Paper should be uploaded electronically to the web site of the =
conference: http://www.uib.es/congres/lanc2002,=20
preferably in .pdf format. For any doubt, contact lanc2002@uib.es .

Papers are invited on the conference theme and related topics. Authors =
must state that their paper have neither=20
been published before nor currently being submitted elsewhere.
Full papers should:
-	be no longer than 15 single spaced pages, including tables, diagrams =
and pictures using a font size of 12=20
points or larger, or=20
-	follow the styles shown at the conference URL: =
http://www.uib.es/congres/lanc2002.=20
The first page must contain an abstract of about 150 words, name and =
affiliation of author(s) as well as the lead=20
author's postal address, telephone number, fax number and e-mail.
Accepted papers will be included in the conference proceedings and will =
be distributed to the attendees at the=20
conference.
The language of the conference is English and papers must be in this =
language.

TUTORIALS=20
We solicit proposals for half/full day tutorial courses outlining the =
subject area, describing level, goal and=20
orientation and a short biography of the speaker(s).
Proposals should be submitted by email to the chairman of the Programme =
Committee

Ramon Puigjamer
Email: putxi@uib.es=20

MINI CONFERENCES, WORKSHOPS AND SPECIAL SESSIONS.
Proposals should be sent to the chairman of the Program Committee =
(putxi@uib.es) with indication of the aims,=20
scope, and call for papers of the event and a short CV of the =
organizer(s) before March 1, 2002.
Specific call for papers will be provided.
Till now two special sessions have been suggested:
-	Poster session for student works coming from Latin American =
Universities
-	On-going networking research session


--Boundary_(ID_M+dsj/a8rWwCBYs6H/SpBQ)--




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From: Tom Chen <tchen@engr.smu.edu>
Subject: CFP: IP Operations and Management (IPOM 2002)
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        * Apologies if you receive multiple copies of this *


                        CALL FOR PAPERS

      2002 IEEE Workshop on IP Operations & Management (IPOM 2002)

                      Octiber 29-31, 2002
                       Dallas, Texas USA
              http://snoopy.seas.smu.edu/ipom2002/

           Sponsored by the IEEE Communications Society

The 2002 IEEE Workshop on IP Operations and Management will
be held in Dallas, Texas, near the "Telecom Corridor" constituted by
Nortel Networks, Ericsson, Alcatel, Nokia, Cisco Systems, and other
major industry leaders.  The workshop will include a day of
tutorials and two days of presentations on original research.
The purpose of the workshop is to share research, experiences, and ideas
among researchers, engineers, and service providers involved in
IP-oriented network management and operations.  As IP-based networks
continue to expand from traditional data services to new real-time
and multimedia services, they become more difficult to manage.
At the same time, their proper operation is more important to maintain
for business.  It is vital to find both theoretical and practical
solutions to address these challenges.

Original papers are invited on such topics as (but not limited to):

* Using SNMP to manage networks
* Web-based network management
* Operations of IP networks
* SNMP versus TMN-based approaches
* Integrated management of multilayer networks
* Management of IP over SONET/SDH or WDM networks
* Management of IP over ATM
* Network management platforms
* Management of QoS in IP networks
* Security management for IP networks
* Mobility management, eg, mobile IP
* Management of Voice over IP
* Accounting, tariffing, and billing
* Network monitoring and diagnostics
* Deployment of new IP services, eg, diffserv, multicast, IPv6, etc.
* CORBA/Java-based network management
* Distributed network management and mobile agents
* IP traffic modeling and management
* Network planning and dimensioning
* Policy driven networks
* Scalability issues
* Case studies and experiments

Instructions for Authors:

Full paper submissions should be submitted electronically to one of
the technical program co-chairs in postscript, PDF, or Microsoft Word
format.  Submissions should be limited to 5 pages (standard double-column
IEEE conference format).  An additional title page should contain the
title of the paper, the authors' name(s), affiliation, address, telephone
and fax numbers, and e-mail of the corresponding author.

Questions and submissions may be directed to either of the
technical program co-chairs:

Tom Chen                         Salah Aidarous
SMU, Dept of EE                  NEC America
PO Box 750338                    6555 N State Highway 161
Dallas, Texas 75275-0338 USA     Irving, Texas 75039 USA
Tel: +1 214 768 8541             Tel:  +1 214 262 3230
Fax: +1 214 768 3573             Fax:  +1 214 262 3225
Email: tchen@engr.smu.edu        Email: saidarous@necam.com

Important dates:

Deadline for submissions:   May 10, 2002
Authors notifications:      August 9, 2002
Final manuscripts due:      September 6, 2002

General chair:

G-S Kuo, National Chengchi University, Taiwan
Email: gskuo@ieee.org





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From: Tom Chen <tchen@engr.smu.edu>
Subject: CFP: IP Operations and Management (IPOM 2002)
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        * Apologies if you receive multiple copies of this *


                        CALL FOR PAPERS

      2002 IEEE Workshop on IP Operations & Management (IPOM 2002)

                      Octiber 29-31, 2002
                       Dallas, Texas USA
              http://snoopy.seas.smu.edu/ipom2002/

           Sponsored by the IEEE Communications Society

The 2002 IEEE Workshop on IP Operations and Management will
be held in Dallas, Texas, near the "Telecom Corridor" constituted by
Nortel Networks, Ericsson, Alcatel, Nokia, Cisco Systems, and other
major industry leaders.  The workshop will include a day of
tutorials and two days of presentations on original research.
The purpose of the workshop is to share research, experiences, and ideas
among researchers, engineers, and service providers involved in
IP-oriented network management and operations.  As IP-based networks
continue to expand from traditional data services to new real-time
and multimedia services, they become more difficult to manage.
At the same time, their proper operation is more important to maintain
for business.  It is vital to find both theoretical and practical
solutions to address these challenges.

Original papers are invited on such topics as (but not limited to):

* Using SNMP to manage networks
* Web-based network management
* Operations of IP networks
* SNMP versus TMN-based approaches
* Integrated management of multilayer networks
* Management of IP over SONET/SDH or WDM networks
* Management of IP over ATM
* Network management platforms
* Management of QoS in IP networks
* Security management for IP networks
* Mobility management, eg, mobile IP
* Management of Voice over IP
* Accounting, tariffing, and billing
* Network monitoring and diagnostics
* Deployment of new IP services, eg, diffserv, multicast, IPv6, etc.
* CORBA/Java-based network management
* Distributed network management and mobile agents
* IP traffic modeling and management
* Network planning and dimensioning
* Policy driven networks
* Scalability issues
* Case studies and experiments

Instructions for Authors:

Full paper submissions should be submitted electronically to one of
the technical program co-chairs in postscript, PDF, or Microsoft Word
format.  Submissions should be limited to 5 pages (standard double-column
IEEE conference format).  An additional title page should contain the
title of the paper, the authors' name(s), affiliation, address, telephone
and fax numbers, and e-mail of the corresponding author.

Questions and submissions may be directed to either of the
technical program co-chairs:

Tom Chen                         Salah Aidarous
SMU, Dept of EE                  NEC America
PO Box 750338                    6555 N State Highway 161
Dallas, Texas 75275-0338 USA     Irving, Texas 75039 USA
Tel: +1 214 768 8541             Tel:  +1 214 262 3230
Fax: +1 214 768 3573             Fax:  +1 214 262 3225
Email: tchen@engr.smu.edu        Email: saidarous@necam.com

Important dates:

Deadline for submissions:   May 10, 2002
Authors notifications:      August 9, 2002
Final manuscripts due:      September 6, 2002

General chair:

G-S Kuo, National Chengchi University, Taiwan
Email: gskuo@ieee.org





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From: Tom Chen <tchen@engr.smu.edu>
Subject: CFP: IP Operations and Management (IPOM 2002)
Content-Type: text/plain; charset="us-ascii" ; format="flowed"
Sender: owner-tcp-impl@grc.nasa.gov
Precedence: bulk

        * Apologies if you receive multiple copies of this *


                        CALL FOR PAPERS

      2002 IEEE Workshop on IP Operations & Management (IPOM 2002)

                      Octiber 29-31, 2002
                       Dallas, Texas USA
              http://snoopy.seas.smu.edu/ipom2002/

           Sponsored by the IEEE Communications Society

The 2002 IEEE Workshop on IP Operations and Management will
be held in Dallas, Texas, near the "Telecom Corridor" constituted by
Nortel Networks, Ericsson, Alcatel, Nokia, Cisco Systems, and other
major industry leaders.  The workshop will include a day of
tutorials and two days of presentations on original research.
The purpose of the workshop is to share research, experiences, and ideas
among researchers, engineers, and service providers involved in
IP-oriented network management and operations.  As IP-based networks
continue to expand from traditional data services to new real-time
and multimedia services, they become more difficult to manage.
At the same time, their proper operation is more important to maintain
for business.  It is vital to find both theoretical and practical
solutions to address these challenges.

Original papers are invited on such topics as (but not limited to):

* Using SNMP to manage networks
* Web-based network management
* Operations of IP networks
* SNMP versus TMN-based approaches
* Integrated management of multilayer networks
* Management of IP over SONET/SDH or WDM networks
* Management of IP over ATM
* Network management platforms
* Management of QoS in IP networks
* Security management for IP networks
* Mobility management, eg, mobile IP
* Management of Voice over IP
* Accounting, tariffing, and billing
* Network monitoring and diagnostics
* Deployment of new IP services, eg, diffserv, multicast, IPv6, etc.
* CORBA/Java-based network management
* Distributed network management and mobile agents
* IP traffic modeling and management
* Network planning and dimensioning
* Policy driven networks
* Scalability issues
* Case studies and experiments

Instructions for Authors:

Full paper submissions should be submitted electronically to one of
the technical program co-chairs in postscript, PDF, or Microsoft Word
format.  Submissions should be limited to 5 pages (standard double-column
IEEE conference format).  An additional title page should contain the
title of the paper, the authors' name(s), affiliation, address, telephone
and fax numbers, and e-mail of the corresponding author.

Questions and submissions may be directed to either of the
technical program co-chairs:

Tom Chen                         Salah Aidarous
SMU, Dept of EE                  NEC America
PO Box 750338                    6555 N State Highway 161
Dallas, Texas 75275-0338 USA     Irving, Texas 75039 USA
Tel: +1 214 768 8541             Tel:  +1 214 262 3230
Fax: +1 214 768 3573             Fax:  +1 214 262 3225
Email: tchen@engr.smu.edu        Email: saidarous@necam.com

Important dates:

Deadline for submissions:   May 10, 2002
Authors notifications:      August 9, 2002
Final manuscripts due:      September 6, 2002

General chair:

G-S Kuo, National Chengchi University, Taiwan
Email: gskuo@ieee.org





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        SIGCOMM-MEMBERS@acm.org, sigmetrics-bb@haven.epm.ornl.gov,
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        tcpsat@lerc.nasa.gov, webrepl@cs.utk.edu, xtp-relay@cs.concordia.ca
From: Tom Chen <tchen@engr.smu.edu>
Subject: CFP: IP Operations and Management (IPOM 2002)
Content-Type: text/plain; charset="us-ascii" ; format="flowed"
Sender: owner-tcp-impl@grc.nasa.gov
Precedence: bulk

        * Apologies if you receive multiple copies of this *


                        CALL FOR PAPERS

      2002 IEEE Workshop on IP Operations & Management (IPOM 2002)

                      Octiber 29-31, 2002
                       Dallas, Texas USA
              http://snoopy.seas.smu.edu/ipom2002/

           Sponsored by the IEEE Communications Society

The 2002 IEEE Workshop on IP Operations and Management will
be held in Dallas, Texas, near the "Telecom Corridor" constituted by
Nortel Networks, Ericsson, Alcatel, Nokia, Cisco Systems, and other
major industry leaders.  The workshop will include a day of
tutorials and two days of presentations on original research.
The purpose of the workshop is to share research, experiences, and ideas
among researchers, engineers, and service providers involved in
IP-oriented network management and operations.  As IP-based networks
continue to expand from traditional data services to new real-time
and multimedia services, they become more difficult to manage.
At the same time, their proper operation is more important to maintain
for business.  It is vital to find both theoretical and practical
solutions to address these challenges.

Original papers are invited on such topics as (but not limited to):

* Using SNMP to manage networks
* Web-based network management
* Operations of IP networks
* SNMP versus TMN-based approaches
* Integrated management of multilayer networks
* Management of IP over SONET/SDH or WDM networks
* Management of IP over ATM
* Network management platforms
* Management of QoS in IP networks
* Security management for IP networks
* Mobility management, eg, mobile IP
* Management of Voice over IP
* Accounting, tariffing, and billing
* Network monitoring and diagnostics
* Deployment of new IP services, eg, diffserv, multicast, IPv6, etc.
* CORBA/Java-based network management
* Distributed network management and mobile agents
* IP traffic modeling and management
* Network planning and dimensioning
* Policy driven networks
* Scalability issues
* Case studies and experiments

Instructions for Authors:

Full paper submissions should be submitted electronically to one of
the technical program co-chairs in postscript, PDF, or Microsoft Word
format.  Submissions should be limited to 5 pages (standard double-column
IEEE conference format).  An additional title page should contain the
title of the paper, the authors' name(s), affiliation, address, telephone
and fax numbers, and e-mail of the corresponding author.

Questions and submissions may be directed to either of the
technical program co-chairs:

Tom Chen                         Salah Aidarous
SMU, Dept of EE                  NEC America
PO Box 750338                    6555 N State Highway 161
Dallas, Texas 75275-0338 USA     Irving, Texas 75039 USA
Tel: +1 214 768 8541             Tel:  +1 214 262 3230
Fax: +1 214 768 3573             Fax:  +1 214 262 3225
Email: tchen@engr.smu.edu        Email: saidarous@necam.com

Important dates:

Deadline for submissions:   May 10, 2002
Authors notifications:      August 9, 2002
Final manuscripts due:      September 6, 2002

General chair:

G-S Kuo, National Chengchi University, Taiwan
Email: gskuo@ieee.org





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From: Tom Chen <tchen@engr.smu.edu>
Subject: CFP: IP Operations and Management (IPOM 2002)
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        * Apologies if you receive multiple copies of this *


                        CALL FOR PAPERS

      2002 IEEE Workshop on IP Operations & Management (IPOM 2002)

                      Octiber 29-31, 2002
                       Dallas, Texas USA
              http://snoopy.seas.smu.edu/ipom2002/

           Sponsored by the IEEE Communications Society

The 2002 IEEE Workshop on IP Operations and Management will
be held in Dallas, Texas, near the "Telecom Corridor" constituted by
Nortel Networks, Ericsson, Alcatel, Nokia, Cisco Systems, and other
major industry leaders.  The workshop will include a day of
tutorials and two days of presentations on original research.
The purpose of the workshop is to share research, experiences, and ideas
among researchers, engineers, and service providers involved in
IP-oriented network management and operations.  As IP-based networks
continue to expand from traditional data services to new real-time
and multimedia services, they become more difficult to manage.
At the same time, their proper operation is more important to maintain
for business.  It is vital to find both theoretical and practical
solutions to address these challenges.

Original papers are invited on such topics as (but not limited to):

* Using SNMP to manage networks
* Web-based network management
* Operations of IP networks
* SNMP versus TMN-based approaches
* Integrated management of multilayer networks
* Management of IP over SONET/SDH or WDM networks
* Management of IP over ATM
* Network management platforms
* Management of QoS in IP networks
* Security management for IP networks
* Mobility management, eg, mobile IP
* Management of Voice over IP
* Accounting, tariffing, and billing
* Network monitoring and diagnostics
* Deployment of new IP services, eg, diffserv, multicast, IPv6, etc.
* CORBA/Java-based network management
* Distributed network management and mobile agents
* IP traffic modeling and management
* Network planning and dimensioning
* Policy driven networks
* Scalability issues
* Case studies and experiments

Instructions for Authors:

Full paper submissions should be submitted electronically to one of
the technical program co-chairs in postscript, PDF, or Microsoft Word
format.  Submissions should be limited to 5 pages (standard double-column
IEEE conference format).  An additional title page should contain the
title of the paper, the authors' name(s), affiliation, address, telephone
and fax numbers, and e-mail of the corresponding author.

Questions and submissions may be directed to either of the
technical program co-chairs:

Tom Chen                         Salah Aidarous
SMU, Dept of EE                  NEC America
PO Box 750338                    6555 N State Highway 161
Dallas, Texas 75275-0338 USA     Irving, Texas 75039 USA
Tel: +1 214 768 8541             Tel:  +1 214 262 3230
Fax: +1 214 768 3573             Fax:  +1 214 262 3225
Email: tchen@engr.smu.edu        Email: saidarous@necam.com

Important dates:

Deadline for submissions:   May 10, 2002
Authors notifications:      August 9, 2002
Final manuscripts due:      September 6, 2002

General chair:

G-S Kuo, National Chengchi University, Taiwan
Email: gskuo@ieee.org





From owner-tcp-impl@grc.nasa.gov  Tue Apr 30 10:11:46 2002
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To: Sebastian Zimmermann <S.Zimmermann@tu-harburg.de>
Cc: tcp-impl@lerc.nasa.gov
Subject: Re: Update of smoothed RTT in case of retransmitted segments 
In-Reply-To: Your message of "24 Apr 2002 15:09:22 +0200."
             <1019653762.7923.30.camel@antares> 
Date: Tue, 30 Apr 2002 09:59:46 -0400
From: Craig Partridge <craig@aland.bbn.com>
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In message <1019653762.7923.30.camel@antares>, Sebastian Zimmermann writes:

>Hello,
>
>I need some help with the implementation of the smoothed RTT calculation
>in TCP in case of retransmitted segments:
>
>Assume that segment 9 is the one being timed. However, segment 8 is
>lost, so an acknowledgement for segment 9 cannot be generated by the
>receiver.
>The sender detects a timeout for segment 8 and retransmits it. Karn's
>algorithm only says that retransmitted segments may not be timed, but -
>in this case - segment 9 never was retransmitted, so the timer is not
>stopped. After the receiver receives the retransmitted segment 8, it
>will ack segment 9.
>
>The problem: the measured RTT is completely wrong, because it still
>contains the retransmission of segment 8.
>
>Since Karn's algorithm doesn't avoid this problem, which one does?

I haven't gone back to re-read our paper, but clearly Phil and I intended
that the ack be ignored, as it may implicitly contain the RTT feedback.

Craig