[tcpm] I-D ACTION:draft-ietf-tcpm-ecnsyn-02.txt

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)	: A. Kuzmanovic, et al.
	Filename	: draft-ietf-tcpm-ecnsyn-02.txt,.ps
	Pages		: 22
	Date		: 2007-7-9

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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