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I-D ACTION:draft-ludwig-tsvwg-tcp-rxt-flag-03.txt



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	Title		: TCP Retransmit (RXT) Flag
	Author(s)	: R. Ludwig, M. Meyer
	Filename	: draft-ludwig-tsvwg-tcp-rxt-flag-03.txt
	Pages		: 6
	Date		: 21-Nov-01
	
This document proposes a solution to TCP∆s retransmission ambiguity
problem. It is based on using a single bit, named the Retransmit
(RXT) flag, taken from the Reserved field of the TCP header. The TCP
sender sets the RXT flag in segments containing retransmitted data.
In response to such a segment, the TCP receiver sends an immediate
pure ACK with the RXT flag set. By inspecting the RXT flag of the
ACKs that arrive after a retransmit the TCP sender can then resolve
the retransmission ambiguity. This protocol feature provides a basis
for future TCP enhancements such as schemes to detect and respond to
spurious timeouts and packet re-orderings.

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