Re: [tcpm] I-D Action:draft-ietf-tcpm-ecnsyn-06.txt

"Adam Langley" <agl@imperialviolet.org> Sun, 24 August 2008 18:57 UTC

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Date: Sun, 24 Aug 2008 11:56:23 -0700
From: "Adam Langley" <agl@imperialviolet.org>
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Subject: Re: [tcpm] I-D Action:draft-ietf-tcpm-ecnsyn-06.txt
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2008/8/22  <Internet-Drafts@ietf.org>rg>:
>        Title           : Adding Explicit Congestion Notification (ECN) Capability to TCP's SYN/ACK Packets
>        Author(s)       : S. Floyd, I. Property
>        Filename        : draft-ietf-tcpm-ecnsyn-06.txt
>        Pages           : 29
>        Date            : 2008-08-22

This seems like a very worthwhile change for little cost!

Attached is a patch against net-2.6 (Linux development tree) to
implement this. I'd be very grateful if someone could review the
packet traces and verify the behaviour.

All traces are in pcap format. If another format would be more
helpful, please ask.

For the first two traces, the passive open host sends 8192 bytes to
the active side and closes the connection. The active side has a 100ms
delay on incoming frames.

ecn-synack-ecn.pcap shows the connection with the SYNACK marked.
ecn-synack-ce shows the behaviour when the SYNACK is CE marked (with
the cwnd reduced to 1 segment etc).

The third trace shows an example of not ECN marking retransmitted SYNACKs.


Cheers


-- 
Adam Langley agl@imperialviolet.org http://www.imperialviolet.org
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