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 : Making TCP more Robust to Long Connectivity Disruptions (TCP-LCD)
Author(s) : A. Zimmermann, A. Hannemann
Filename : draft-ietf-tcpm-tcp-lcd-00.txt
Pages : 25
Date : 2009-11-17
Disruptions in end-to-end path connectivity, which last longer than
one retransmission timeout cause suboptimal TCP performance. The
reason for the 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 leads in turn to a deferred detection of the re-establishment of
the connection since TCP waits until the next retransmission timeout
occurs before attempting the retransmission.
This document proposes a algorithm for making TCP more robust to long
connectivity disruptions (TCP-LCD). The memo 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 revert strategy of the
retransmission timer is specified that enables a more prompt
detection of whether the connectivity to a previously disconnected
peer node has been restored or not. TCP-LCD is a TCP sender-only
modification that effectively improves TCP performance in presence of
connectivity disruptions.
Status of this Memo
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