I-D ACTION:draft-ietf-tsvwg-tcp-eifel-alg-07.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 Transport Area Working Group Working Group of the IETF.

	Title		: The Eifel Detection Algorithm for TCP
	Author(s)	: L. Reiner, M. Meyer
	Filename	: draft-ietf-tsvwg-tcp-eifel-alg-07.txt
	Pages		: 12
	Date		: 2002-12-6
	
The Eifel detection algorithm allows a TCP sender to detect a
posteriori whether it has entered loss recovery unnecessarily. It
requires that the TCP Timestamps option defined in RFC1323 is enabled
for a connection. The Eifel detection algorithm makes use of the fact
that the TCP Timestamps option eliminates the retransmission
ambiguity in TCP. Based on the timestamp of the first acceptable ACK
that arrives during loss recovery, it decides whether loss recovery
was entered unnecessarily. The Eifel detection algorithm provides a
basis for future TCP enhancements. This includes response algorithms
to back out of loss recovery by restoring a TCP sender's congestion
control state.

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