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 : Improving the Robustness of TCP to Non-Congestion Events
Author(s) : S. Bhandarkar, et al.
Filename : draft-ietf-tcpm-tcp-dcr-04.txt
Pages : 17
Date : 2005-6-3
This document specifies Non-Congestion Robustness (NCR) for TCP. In
the absence of explicit congestion notification from the network,
TCP's loss recovery algorithms treat the receipt of three duplicate
acknowledgments as an implicit indication of congestion in the
network. This is not always correct, notably in the case when
network paths reorder segments (for whatever reason), resulting in
degraded performance. TCP-NCR is designed to mitigate this degraded
performance by increasing the number of duplicate acknowledgments
required to trigger loss recovery, based on the current state of the
connection, in an effort to disambiguate true segment loss from
segment reordering. In addition, we specify an option, Aggressive
Limited Transmit, where the TCP sender does not reduce its sending
rate until a segment is actually retransmitted; this would delay the
reduction of the sending rate by roughly one round-trip time compared
to current TCP implementations. This document specifies the changes
to TCP, as well as the costs and benefits of these modifications.
A URL for this Internet-Draft is:
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