[tcpm] I-D ACTION:draft-ietf-tcpm-tcp-dcr-07.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		: Improving the Robustness of TCP to Non-Congestion Events
	Author(s)	: S. Bhandarkar, et al.
	Filename	: draft-ietf-tcpm-tcp-dcr-07.txt
	Pages		: 18
	Date		: 2006-2-15

This document specifies Non-Congestion Robustness (NCR) for TCP.  In
the absence of explicit congestion notification from the network TCP
uses loss as an indication of congestion.  One of the ways TCP
detects loss is using the arrival of three duplicate acknowledgments.
However, this heuristic is not always correct, notably in the case
when network paths reorder segments (for whatever reason), resulting
in degraded performance.  TCP-NCR is designed to mitigate this
degraded performance by increasing the number of duplicate
acknowledgments required to trigger loss recovery, based on the
current state of the connection, in an effort to better disambiguate
true segment loss from segment reordering.  This document specifies
the changes to TCP, as well as the costs and benefits of these
modifications.

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