From tsvwg-admin@ietf.org  Mon Jul  3 02:49:38 2000
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To: Chris Aston <chris.aston@synaxia.com>
Cc: "'tsvwg@ietf.org'" <tsvwg@ietf.org>
Subject: Re: [Tsvwg] Status changes of "TCP Congestion Window Validation"
In-reply-to: Your message of Fri, 30 Jun 2000 17:25:38 PDT.
Date: Sun, 02 Jul 2000 23:36:43 PDT
From: Vern Paxson <vern@ee.lbl.gov>
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> Can anyone help me understand the reasons behind the status changes of the
> "TCP Congestion Window Validation" RFC?
> 
> In the mail to tsvwg of 30 Oct 99 it talks about considering it as a
> "Proposed Standard". Then in April 2000 it was approved by the IESG for
> publication, but as an "Informational" RFC. Then just a few days ago it was
> published as RFC 2861, but as an "Experimental" RFC.
> 
> I guess I've got two questions:
> 
> 1) What was the reasoning behind (and implications of) the status changes in
> this RFC? So far I haven't been able to find any email discussion about it.

It started off as a candidate for Proposed because we initially thought it
would be a non-controversial change.  The discussion at the DC IETF brought
up a point of contention (what constants to use when decaying the window),
and consequently the ADs decided to target it for Experimental.

The document was never being considered for Informational - the approval
announcement with that status rather than Experimental was an error by the
IESG secretariat in the post-Adelaide crunch, which was fixed as soon as
it was detected.

> 2) More generally, does this mean that it's not possible to assume anything
> about the final status of an internet draft ie do you really have to wait
> for it to be published by the RFC editor?

It will usually have the status for which it's last-called.  Documents
are sometimes downgraded by the IESG from Proposed to Experimental or
Informational, if the technology has some significant problems or
unanswered questions, or is critical enough that it's important to
encourage experimentation (this is often the case for changes to TCP).

		Vern

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From tsvwg-admin@ietf.org  Thu Jul 20 09:43:37 2000
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To: tsvwg@ietf.org
From: Mark Allman <mallman@grc.nasa.gov>
Reply-To: mallman@grc.nasa.gov
Organization: Late Night Hackers, NASA Glenn, Cleveland, Ohio
Song-of-the-Day: Big Bang Baby
Date: Thu, 20 Jul 2000 09:36:26 -0400
Subject: [Tsvwg] new I-D on modified cwnd increase during slow start
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Folks-

A week or so ago I submitted the following Internet-Draft:

    Mark Allman. TCP Congestion Control with Appropriate Byte
    Counting, July 2000. Internet-Draft draft-allman-tcp-abc-00.txt
    (work in progress).  
    http://ftp.ietf.org/internet-drafts/draft-allman-tcp-abc-00.txt

The document outlines an alternate method for increasing cwnd during
slow start called "Appropriate Byte Counting".  I have requested a
little time to chat about this at the upcoming tsvwg meeting, but I
made the request quite late in the game and I haven't heard whether
Scott and Allison will have any time available for this topic.  But,
I wanted to give everyone a heads up on the draft just in case we
get to talk about it.  And, even if there is no time in tsvwg for
this, I'd still like to hear comments in the hall or on the list!

Thanks,
allman


---
http://roland.grc.nasa.gov/~mallman/

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From tsvwg-admin@ietf.org  Mon Jul 31 20:23:20 2000
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Subject: [Tsvwg] RFC 2883 on SACK Extension
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--NextPart


A new Request for Comments is now available in online RFC libraries.


        RFC 2883

        Title:	    An Extension to the Selective Acknowledgement
                    (SACK) Option for TCP 
        Author(s):  S. Floyd, J. Mahdavi, M. Mathis, M. Podolsky
        Status:     Standards Track
	Date:       July 2000
        Mailbox:    floyd@aciri.org, mahdavi@novell.com,
                    mathis@psc.edu, podolsky@eecs.berkeley.edu
        Pages:      17
        Characters: 35794
        Updates/Obsoletes/SeeAlso:  None

        I-D Tag:    draft-floyd-sack-00.txt

        URL:        ftp://ftp.isi.edu/in-notes/rfc2883.txt


This note defines an extension of the Selective Acknowledgement
(SACK) Option [RFC2018] for TCP.  RFC 2018 specified the use of the
SACK option for acknowledging out-of-sequence data not covered by
TCP's cumulative acknowledgement field.  This note extends RFC 2018
by specifying the use of the SACK option for acknowledging duplicate
packets.  This note suggests that when duplicate packets are
received, the first block of the SACK option field can be used to
report the sequence numbers of the packet that triggered the
acknowledgement.  This extension to the SACK option allows the TCP
sender to infer the order of packets received at the receiver,
allowing 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 [BPS99], ACK
loss, packet replication, and/or early retransmit timeouts.

This document is a product of the Transport Area Working Group Working
Group of the IETF.

This is now a Proposed Standard Protocol.

This document specifies an Internet standards track protocol for
the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the
"Internet Official Protocol Standards" (STD 1) for the
standardization state and status of this protocol.  Distribution
of this memo is unlimited.

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Submissions for Requests for Comments should be sent to
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Authors, for further information.


Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute

...

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