A new Request for Comments is now available in online RFC libraries.
RFC 6069
Title: Making TCP More Robust to
Long Connectivity Disruptions (TCP-LCD)
Author: A. Zimmermann, A. Hannemann
Status: Experimental
Stream: IETF
Date: December 2010
Mailbox: zimmermann@cs.rwth-aachen.de,
hannemann@nets.rwth-aachen.de
Pages: 23
Characters: 59600
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-tcpm-tcp-lcd-03.txt
URL: http://www.rfc-editor.org/rfc/rfc6069.txt
Disruptions in end-to-end path connectivity, which last longer than
one retransmission timeout, cause suboptimal TCP performance. The
reason for this performance degradation is that TCP interprets
segment loss induced by long connectivity disruptions as a sign of
congestion, resulting in repeated retransmission timer backoffs.
This, in turn, leads to a delayed detection of the re-establishment
of the connection since TCP waits for the next retransmission timeout
before it attempts a retransmission.
This document proposes an algorithm to make TCP more robust to long
connectivity disruptions (TCP-LCD). It describes how standard ICMP
messages can be exploited during timeout-based loss recovery to
disambiguate true congestion loss from non-congestion loss caused by
connectivity disruptions. Moreover, a reversion strategy of the
retransmission timer is specified that enables a more prompt
detection of whether or not the connectivity to a previously
disconnected peer node has been restored. TCP-LCD is a TCP sender-
only modification that effectively improves TCP performance in the
case of connectivity disruptions. This document defines an Experimental
Protocol for the Internet community.
This document is a product of the TCP Maintenance and Minor Extensions Working Group of the IETF.
EXPERIMENTAL: This memo defines an Experimental Protocol for the
Internet community. It does not specify an Internet standard of any
kind. Discussion and suggestions for improvement are requested.
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