From mailman-owner@ietf.org Mon May 1 05:03:10 2000 Received: from optimus.ietf.org (ietf.org [132.151.1.19] (may be forged)) by ietf.org (8.9.1a/8.9.1a) with ESMTP id FAA22432 for ; Mon, 1 May 2000 05:03:10 -0400 (EDT) Received: from optimus.ietf.org (localhost [127.0.0.1]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id FAA12097 for ; Mon, 1 May 2000 05:03:11 -0400 (EDT) Date: Mon, 1 May 2000 05:03:11 -0400 (EDT) Message-Id: <200005010903.FAA12097@optimus.ietf.org> From: mailman-owner@ietf.org Subject: ietf.org mailing list memberships reminder To: tsvwg-archive@ns.ietf.org X-No-Archive: yes Precedence: bulk X-Mailman-Version: 1.0 Precedence: bulk List-Id: Diffserv Discussion List This is a reminder, sent out once a month, about your ietf.org mailing list memberships. It includes your subscription info and how to use it to change it or unsubscribe from a list. 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Passwords for tsvwg-archive@optimus.ietf.org: List Password // URL ---- -------- tsvwg@ietf.org kfQi http://www1.ietf.org/mailman/options/tsvwg/tsvwg-archive@optimus.ietf.org From tsvwg-admin@ietf.org Tue May 2 06:50:56 2000 Received: from optimus.ietf.org (ietf.org [132.151.1.19] (may be forged)) by ietf.org (8.9.1a/8.9.1a) with ESMTP id GAA26895 for ; Tue, 2 May 2000 06:50:56 -0400 (EDT) Received: from optimus.ietf.org (localhost [127.0.0.1]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id GAA16121; Tue, 2 May 2000 06:43:47 -0400 (EDT) Received: from ietf.org (odin [132.151.1.176]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id GAA16093 for ; Tue, 2 May 2000 06:43:46 -0400 (EDT) Received: from CNRI.Reston.VA.US (localhost [127.0.0.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id GAA26769; Tue, 2 May 2000 06:43:44 -0400 (EDT) Message-Id: <200005021043.GAA26769@ietf.org> Mime-Version: 1.0 Content-Type: Multipart/Mixed; Boundary="NextPart" To: IETF-Announce: ; Cc: tsvwg@ietf.org From: Internet-Drafts@ietf.org Reply-to: Internet-Drafts@ietf.org Date: Tue, 02 May 2000 06:43:44 -0400 Subject: [Tsvwg] I-D ACTION:draft-xiao-tcp-prec-02.txt Sender: tsvwg-admin@ietf.org Errors-To: tsvwg-admin@ietf.org X-Mailman-Version: 1.0 Precedence: bulk List-Id: Transport Area Working Group X-BeenThere: tsvwg@ietf.org --NextPart A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Transport Area Working Group Working Group of the IETF. Title : TCP Processing of the IPv4 Precedence Field Author(s) : X. Xiao, A. Hannan, V. Paxson, E. Crabbe Filename : draft-xiao-tcp-prec-02.txt Pages : 7 Date : 01-May-00 This draft describes a conflict between TCP [RFC793] and DiffServ [RFC2475] on the use of the three leftmost bits in the TOS octet of an IPv4 header [RFC791]. In a network that contains DiffServ-capable nodes, such a conflict can cause failures in establishing TCP connections or can cause some established TCP connections to be reset undesirably. This draft proposes a modification to TCP for resolving the conflict. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-xiao-tcp-prec-02.txt Internet-Drafts are also available by anonymous FTP. Login with the username "anonymous" and a password of your e-mail address. After logging in, type "cd internet-drafts" and then "get draft-xiao-tcp-prec-02.txt". A list of Internet-Drafts directories can be found in http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt Internet-Drafts can also be obtained by e-mail. Send a message to: mailserv@ietf.org. In the body type: "FILE /internet-drafts/draft-xiao-tcp-prec-02.txt". NOTE: The mail server at ietf.org can return the document in MIME-encoded form by using the "mpack" utility. To use this feature, insert the command "ENCODING mime" before the "FILE" command. To decode the response(s), you will need "munpack" or a MIME-compliant mail reader. Different MIME-compliant mail readers exhibit different behavior, especially when dealing with "multipart" MIME messages (i.e. documents which have been split up into multiple messages), so check your local documentation on how to manipulate these messages. Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft. --NextPart Content-Type: Multipart/Alternative; Boundary="OtherAccess" --OtherAccess Content-Type: Message/External-body; access-type="mail-server"; server="mailserv@ietf.org" Content-Type: text/plain Content-ID: <20000501102255.I-D@ietf.org> ENCODING mime FILE /internet-drafts/draft-xiao-tcp-prec-02.txt --OtherAccess Content-Type: Message/External-body; name="draft-xiao-tcp-prec-02.txt"; site="ftp.ietf.org"; access-type="anon-ftp"; directory="internet-drafts" Content-Type: text/plain Content-ID: <20000501102255.I-D@ietf.org> --OtherAccess-- --NextPart-- _______________________________________________ tsvwg mailing list tsvwg@ietf.org http://www1.ietf.org/mailman/listinfo/tsvwg From tsvwg-admin@ietf.org Thu May 4 06:41:07 2000 Received: from optimus.ietf.org (ietf.org [132.151.1.19] (may be forged)) by ietf.org (8.9.1a/8.9.1a) with ESMTP id GAA01979 for ; Thu, 4 May 2000 06:41:06 -0400 (EDT) Received: from optimus.ietf.org (localhost [127.0.0.1]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id GAA25764; Thu, 4 May 2000 06:36:05 -0400 (EDT) Received: from ietf.org (odin [132.151.1.176]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id GAA25733 for ; Thu, 4 May 2000 06:36:03 -0400 (EDT) Received: from CNRI.Reston.VA.US (localhost [127.0.0.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id GAA01893; Thu, 4 May 2000 06:36:02 -0400 (EDT) Message-Id: <200005041036.GAA01893@ietf.org> Mime-Version: 1.0 Content-Type: Multipart/Mixed; Boundary="NextPart" To: IETF-Announce: ; Cc: tsvwg@ietf.org From: Internet-Drafts@ietf.org Reply-to: Internet-Drafts@ietf.org Date: Thu, 04 May 2000 06:36:02 -0400 Subject: [Tsvwg] I-D ACTION:draft-xiao-tcp-prec-03.txt Sender: tsvwg-admin@ietf.org Errors-To: tsvwg-admin@ietf.org X-Mailman-Version: 1.0 Precedence: bulk List-Id: Transport Area Working Group X-BeenThere: tsvwg@ietf.org --NextPart A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Transport Area Working Group Working Group of the IETF. Title : TCP Processing of the IP Precedence Field Author(s) : X. Xiao, A. Hannan, V. Paxson, E. Crabbe Filename : draft-xiao-tcp-prec-03.txt Pages : 7 Date : 03-May-00 This draft describes a conflict between TCP [RFC793] and DiffServ [RFC2475] on the use of the three leftmost bits in the TOS octet of an IPv4 header [RFC791]. In a network that contains DiffServ-capable nodes, such a conflict can cause failures in establishing TCP connections or can cause some established TCP connections to be reset undesirably. This draft proposes a modification to TCP for resolving the conflict. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-xiao-tcp-prec-03.txt Internet-Drafts are also available by anonymous FTP. Login with the username "anonymous" and a password of your e-mail address. After logging in, type "cd internet-drafts" and then "get draft-xiao-tcp-prec-03.txt". A list of Internet-Drafts directories can be found in http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt Internet-Drafts can also be obtained by e-mail. Send a message to: mailserv@ietf.org. In the body type: "FILE /internet-drafts/draft-xiao-tcp-prec-03.txt". NOTE: The mail server at ietf.org can return the document in MIME-encoded form by using the "mpack" utility. To use this feature, insert the command "ENCODING mime" before the "FILE" command. To decode the response(s), you will need "munpack" or a MIME-compliant mail reader. Different MIME-compliant mail readers exhibit different behavior, especially when dealing with "multipart" MIME messages (i.e. documents which have been split up into multiple messages), so check your local documentation on how to manipulate these messages. Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft. --NextPart Content-Type: Multipart/Alternative; Boundary="OtherAccess" --OtherAccess Content-Type: Message/External-body; access-type="mail-server"; server="mailserv@ietf.org" Content-Type: text/plain Content-ID: <20000503110335.I-D@ietf.org> ENCODING mime FILE /internet-drafts/draft-xiao-tcp-prec-03.txt --OtherAccess Content-Type: Message/External-body; name="draft-xiao-tcp-prec-03.txt"; site="ftp.ietf.org"; access-type="anon-ftp"; directory="internet-drafts" Content-Type: text/plain Content-ID: <20000503110335.I-D@ietf.org> --OtherAccess-- --NextPart-- _______________________________________________ tsvwg mailing list tsvwg@ietf.org http://www1.ietf.org/mailman/listinfo/tsvwg From tsvwg-admin@ietf.org Thu May 4 19:02:39 2000 Received: from optimus.ietf.org (ietf.org [132.151.1.19] (may be forged)) by ietf.org (8.9.1a/8.9.1a) with ESMTP id TAA20501 for ; Thu, 4 May 2000 19:02:38 -0400 (EDT) Received: from optimus.ietf.org (localhost [127.0.0.1]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id SAA03253; Thu, 4 May 2000 18:57:12 -0400 (EDT) Received: from ietf.org (odin [132.151.1.176]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id SAA03226 for ; Thu, 4 May 2000 18:57:11 -0400 (EDT) Received: from east.isi.edu (east.isi.edu [38.245.76.2]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id SAA20381 for ; Thu, 4 May 2000 18:57:10 -0400 (EDT) From: mankin@ISI.EDU Received: from maia.east.isi.edu (maia.east.isi.edu [38.245.76.14]) by east.isi.edu (8.9.2/8.9.2) with SMTP id SAA06066; Thu, 4 May 2000 18:57:38 -0400 (EDT) Date: Thu, 4 May 00 18:59:34 EDT Posted-Date: Thu, 4 May 00 18:59:34 EDT Message-Id: <10005042259.AA15391@maia.east.isi.edu> Received: by maia.east.isi.edu (4.1/4.0.3-6) id ; Thu, 4 May 00 18:59:34 EDT To: tsvwg@ietf.org Cc: mallman@grc.nasa.gov, mankin@ISI.EDU, sob@harvard.edu, vern@aciri.org Subject: [Tsvwg] Working Group last call for RTO draft Sender: tsvwg-admin@ietf.org Errors-To: tsvwg-admin@ietf.org X-Mailman-Version: 1.0 Precedence: bulk List-Id: Transport Area Working Group X-BeenThere: tsvwg@ietf.org Folks, This starts a two-week working group last call for draft-paxson-tcp-rto-01.txt, Computing TCP's Retransmission Timer, by Vern Paxson and Mark Allman. It is being reviewed for standards track publication. Please send your comments to the list or the authors by May 19. Scott and Allison _______________________________________________ tsvwg mailing list tsvwg@ietf.org http://www1.ietf.org/mailman/listinfo/tsvwg From tsvwg-admin@ietf.org Thu May 4 19:50:14 2000 Received: from optimus.ietf.org (ietf.org [132.151.1.19] (may be forged)) by ietf.org (8.9.1a/8.9.1a) with ESMTP id TAA21314 for ; Thu, 4 May 2000 19:50:14 -0400 (EDT) Received: from optimus.ietf.org (localhost [127.0.0.1]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id TAA03724; Thu, 4 May 2000 19:41:35 -0400 (EDT) Received: from ietf.org (odin [132.151.1.176]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id TAA03695 for ; Thu, 4 May 2000 19:41:33 -0400 (EDT) Received: from mercury.Sun.COM (mercury.Sun.COM [192.9.25.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id TAA21155 for ; Thu, 4 May 2000 19:41:32 -0400 (EDT) Received: from sunmail1.Sun.COM ([129.145.1.2]) by mercury.Sun.COM (8.9.3+Sun/8.9.3) with ESMTP id QAA13747 for ; Thu, 4 May 2000 16:41:32 -0700 (PDT) Received: from jurassic.eng.sun.com (jurassic.Eng.Sun.COM [129.146.84.31]) by sunmail1.Sun.COM (8.9.1b+Sun/8.9.1/ENSMAIL,v1.6.1-sunmail1) with ESMTP id QAA03940 for ; Thu, 4 May 2000 16:41:32 -0700 (PDT) Received: from shield (shield.Eng.Sun.COM [129.146.85.114]) by jurassic.eng.sun.com (8.10.1+Sun/8.10.1) with SMTP id e44NfUh350963 for ; Thu, 4 May 2000 16:41:30 -0700 (PDT) Date: Thu, 4 May 2000 16:41:29 -0700 (PDT) From: Kacheong Poon Reply-To: Kacheong Poon Subject: Re: [Tsvwg] Working Group last call for RTO draft To: tsvwg@ietf.org In-Reply-To: "Your message with ID" <10005042259.AA15391@maia.east.isi.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; CHARSET=US-ASCII Sender: tsvwg-admin@ietf.org Errors-To: tsvwg-admin@ietf.org X-Mailman-Version: 1.0 Precedence: bulk List-Id: Transport Area Working Group X-BeenThere: tsvwg@ietf.org One question about the draft. In section 2, (2.2) When the first RTT measurement R is made, the host MUST set SRTT <- R RTTVAR <- R/2 RTO <- SRTT + max (G, K*RTTVAR) where K = 4. Suppose it is a long thin network, and the first R is measured using a small packet. The next segment is in full MSS size. But the network is so "thin" that the segment takes longer than 2*R to transmit to the other end, the above MUST will probably cause a timeout because RTO is 3*R (assuming 2*R > G) and another R is needed for the ACK to get back to sender. Should the requirement be changed to something like "RTO MUST be set to a minimum of" the above calculation? K. Poon. kcpoon@eng.sun.com _______________________________________________ tsvwg mailing list tsvwg@ietf.org http://www1.ietf.org/mailman/listinfo/tsvwg From tsvwg-admin@ietf.org Fri May 5 09:06:41 2000 Received: from optimus.ietf.org (ietf.org [132.151.1.19] (may be forged)) by ietf.org (8.9.1a/8.9.1a) with ESMTP id JAA17701 for ; Fri, 5 May 2000 09:06:41 -0400 (EDT) Received: from optimus.ietf.org (localhost [127.0.0.1]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id IAA14362; Fri, 5 May 2000 08:59:49 -0400 (EDT) Received: from ietf.org (odin [132.151.1.176]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id IAA14335 for ; Fri, 5 May 2000 08:59:37 -0400 (EDT) Received: from lombok-fi.lerc.nasa.gov (lombok-fi.lerc.nasa.gov [139.88.112.33]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id IAA17451 for ; Fri, 5 May 2000 08:59:32 -0400 (EDT) Received: from guns (guns.lerc.nasa.gov [139.88.44.160]) by lombok-fi.lerc.nasa.gov (NASA LeRC 8.9.1.1/8.9.1) with ESMTP id IAA15482; Fri, 5 May 2000 08:59:31 -0400 (EDT) Message-Id: <200005051259.IAA15482@lombok-fi.lerc.nasa.gov> To: Kacheong Poon From: Mark Allman Reply-To: mallman@grc.nasa.gov cc: tsvwg@ietf.org Subject: Re: [Tsvwg] Working Group last call for RTO draft Organization: Late Night Hackers, NASA Glenn, Cleveland, Ohio Song-of-the-Day: In the City Date: Fri, 05 May 2000 08:59:31 -0400 Sender: tsvwg-admin@ietf.org Errors-To: tsvwg-admin@ietf.org X-Mailman-Version: 1.0 Precedence: bulk List-Id: Transport Area Working Group X-BeenThere: tsvwg@ietf.org > One question about the draft. In section 2, > > (2.2) When the first RTT measurement R is made, the host MUST set > > SRTT <- R > RTTVAR <- R/2 > RTO <- SRTT + max (G, K*RTTVAR) > > where K = 4. > > Suppose it is a long thin network, and the first R is measured > using a small packet. The next segment is in full MSS size. But > the network is so "thin" that the segment takes longer than 2*R to > transmit to the other end, the above MUST will probably cause a > timeout because RTO is 3*R (assuming 2*R > G) and another R is > needed for the ACK to get back to sender. Should the requirement > be changed to something like "RTO MUST be set to a minimum of" the > above calculation? Two answers, I think... (1) By "small packet" above do you mean the 3WHS packets? I believe the I-D leaves out (i.e., as an implmentation detail) which set of segments you should use to take the first RTT measurement. So, rather than using the SYN-SYN/ACK exchange you could use the first data segment and the corresponding ACK, I think. Of course, the first data segment could be small, as well, so... (2) The intro of the I-D says... In some situations it may be beneficial for a TCP sender to be more conservative than the algorithms detailed in this document allow. However, a TCP MUST NOT be more aggressive than the following algorithms allow. I.e., you're always allowed to be more conservative than any given point in the remainder of the I-D allows. (We use this statement in the intro rather than restating this in each point in the rest of the ID). allman --- http://roland.grc.nasa.gov/~mallman/ _______________________________________________ tsvwg mailing list tsvwg@ietf.org http://www1.ietf.org/mailman/listinfo/tsvwg From tsvwg-admin@ietf.org Mon May 8 08:40:42 2000 Received: from optimus.ietf.org (ietf.org [132.151.1.19] (may be forged)) by ietf.org (8.9.1a/8.9.1a) with ESMTP id IAA06162 for ; Mon, 8 May 2000 08:40:42 -0400 (EDT) Received: from optimus.ietf.org (localhost [127.0.0.1]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id IAA28370; Mon, 8 May 2000 08:23:54 -0400 (EDT) Received: from ietf.org (odin [132.151.1.176]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id IAA28339 for ; Mon, 8 May 2000 08:23:52 -0400 (EDT) Received: from CNRI.Reston.VA.US (localhost [127.0.0.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id IAA05759; Mon, 8 May 2000 08:23:39 -0400 (EDT) Message-Id: <200005081223.IAA05759@ietf.org> To: IETF-Announce: ; Cc: RFC Editor , iana@iana.org Cc: Internet Architecture Board Cc: tsvwg@ietf.org From: The IESG Date: Mon, 08 May 2000 08:23:39 -0400 Subject: [Tsvwg] Document Action: TCP Congestion Window Validation to Informational Sender: tsvwg-admin@ietf.org Errors-To: tsvwg-admin@ietf.org X-Mailman-Version: 1.0 Precedence: bulk List-Id: Transport Area Working Group X-BeenThere: tsvwg@ietf.org The IESG has approved the Internet-Draft 'TCP Congestion Window Validation' as an Informational RFC. This document is the product of the Transport Area Working Group Working Group. The IESG contact persons are Scott Bradner and Allison Mankin. _______________________________________________ tsvwg mailing list tsvwg@ietf.org http://www1.ietf.org/mailman/listinfo/tsvwg From tsvwg-admin@ietf.org Tue May 30 14:53:48 2000 Received: from optimus.ietf.org (ietf.org [132.151.1.19] (may be forged)) by ietf.org (8.9.1a/8.9.1a) with ESMTP id OAA07023 for ; Tue, 30 May 2000 14:53:47 -0400 (EDT) Received: from optimus.ietf.org (localhost [127.0.0.1]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id OAA01816; Tue, 30 May 2000 14:46:17 -0400 (EDT) Received: from ietf.org (odin [132.151.1.176]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id OAA01787 for ; Tue, 30 May 2000 14:46:15 -0400 (EDT) Received: from CNRI.Reston.VA.US (localhost [127.0.0.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id OAA06835; Tue, 30 May 2000 14:46:14 -0400 (EDT) Message-Id: <200005301846.OAA06835@ietf.org> To: IETF-Announce: ; Cc: tsvwg@ietf.org From: The IESG Reply-to: iesg@ietf.org Date: Tue, 30 May 2000 14:46:14 -0400 Subject: [Tsvwg] Last Call: Computing TCP's Retransmission Timer to Proposed Standard Sender: tsvwg-admin@ietf.org Errors-To: tsvwg-admin@ietf.org X-Mailman-Version: 1.0 Precedence: bulk List-Id: Transport Area Working Group X-BeenThere: tsvwg@ietf.org The IESG has received a request from the Transport Area Working Group Working Group to consider Computing TCP's Retransmission Timer as a Proposed Standard. The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send any comments to the iesg@ietf.org or ietf@ietf.org mailing lists by June 13, 2000. Files can be obtained via http://www.ietf.org/internet-drafts/draft-paxson-tcp-rto-01.txt _______________________________________________ tsvwg mailing list tsvwg@ietf.org http://www1.ietf.org/mailman/listinfo/tsvwg From tsvwg-admin@ietf.org Wed May 31 08:02:54 2000 Received: from optimus.ietf.org (ietf.org [132.151.1.19] (may be forged)) by ietf.org (8.9.1a/8.9.1a) with ESMTP id IAA05523 for ; Wed, 31 May 2000 08:02:54 -0400 (EDT) Received: from optimus.ietf.org (localhost [127.0.0.1]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id HAA21443; Wed, 31 May 2000 07:56:28 -0400 (EDT) Received: from ietf.org (odin [132.151.1.176]) by optimus.ietf.org (8.9.1a/8.9.1) with ESMTP id HAA21412 for ; Wed, 31 May 2000 07:56:27 -0400 (EDT) Received: from CNRI.Reston.VA.US (localhost [127.0.0.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id HAA05120; Wed, 31 May 2000 07:56:24 -0400 (EDT) Message-Id: <200005311156.HAA05120@ietf.org> To: IETF-Announce: ; Cc: RFC Editor Cc: Internet Architecture Board Cc: tsvwg@ietf.org From: The IESG Date: Wed, 31 May 2000 07:56:24 -0400 Subject: [Tsvwg] Protocol Action: An Extension to the Selective Acknowledgement (SACK) Option for TCP to Proposed Standard Sender: tsvwg-admin@ietf.org Errors-To: tsvwg-admin@ietf.org X-Mailman-Version: 1.0 Precedence: bulk List-Id: Transport Area Working Group X-BeenThere: tsvwg@ietf.org The IESG has approved the Internet-Draft 'An Extension to the Selective Acknowledgement (SACK) Option for TCP' as a Proposed Standard. This document is the product of the Transport Area Working Group Working Group. The IESG contact persons are Scott Bradner and Allison Mankin. Technical Summary This document defines an extension to SACK that allows a TCP receiver to communicate to the sender that it received multiple copies of data spanning a particular range of sequence numbers. This information allows the sender to infer when it has unnecessarily retransmitted a packet. A TCP sender could then use this information for more robust operation in an environment of reordered packets, ACK loss, packet replication, and/or early retransmit timeouts, though how it might do so is beyond the scope of this document. Working Group Summary The only issue raised with the document was whether its status should be Experimental rather than Proposed. On advice from the TSV directorate, the chairs/ADs concluded that the change is sufficiently minor, yet useful, that Proposed is warranted. Protocol Quality Vern Paxson reviewed the spec for the IESG. _______________________________________________ tsvwg mailing list tsvwg@ietf.org http://www1.ietf.org/mailman/listinfo/tsvwg