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I-D ACTION:draft-ludwig-tsvwg-tcp-fast-timeouts-00.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.


	Title		: Responding to Fast Timeouts in TCP
	Author(s)	: R. Ludwig
	Filename	: draft-ludwig-tsvwg-tcp-fast-timeouts-00.txt
	Pages		: 6
	Date		: 24-Jul-02
	
A 'fast timeout' occurs if the retransmission timer expires, and
afterwards the TCP sender receives the duplicate ACK that would have
triggered a fast retransmit of the oldest outstanding segment. In
this case, staying in slow start is an unnecessarily drastic response
to the congestion indication. Instead, we believe it is safe to back
out of the slow start phase but instead go into the fast recovery
phase. One benefit of this approach is that the potentially following
duplicate ACKs can be exploited for advanced loss recovery
algorithms.

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