[tcpm] I-D Action:draft-ietf-tcpm-ecnsyn-03.txt

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Subject: [tcpm] I-D Action:draft-ietf-tcpm-ecnsyn-03.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions Working Group of the IETF.


	Title           : Adding Explicit Congestion Notification (ECN) Capability to TCP's SYN/ACK Packets
	Author(s)       : S. Floyd, I. Property
	Filename        : draft-ietf-tcpm-ecnsyn-03.txt
	Pages           : 23
	Date            : 2007-11-18

This draft specifies a modification to RFC 3168 to allow TCP SYN/ACK
packets to be ECN-Capable.  For TCP, RFC 3168 only specifies setting
an ECN-Capable codepoint on data packets, and not on SYN and SYN/ACK
packets.  However, because of the high cost to the TCP transfer of
having a SYN/ACK packet dropped, with the resulting retransmit
timeout, this document specifies the use of ECN for the SYN/ACK
packet itself, when sent in response to a SYN packet with the two ECN
flags set in the TCP header, indicating a willingness to use ECN.
Setting TCP SYN/ACK packets as ECN-Capable can be of great benefit to
the TCP connection, avoiding the severe penalty of a retransmit
timeout for a connection that has not yet started placing a load on
the network.  The sender of the SYN/ACK packet must respond to a
report of an ECN-marked SYN/ACK packet by reducing its initial
congestion window from two, three, or four segments to one segment,
thereby reducing the subsequent load from that connection on the
network.

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