[rfc-dist] RFC 4653 on Improving the Robustness of TCP to Non-Congestion Events
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Thu Aug 31 11:04:23 PDT 2006
A new Request for Comments is now available in online RFC libraries.
Title: Improving the Robustness of TCP
to Non-Congestion Events
Author: S. Bhandarkar, A. L. N. Reddy,
M. Allman, E. Blanton
Date: August 2006
Mailbox: sumitha at tamu.edu,
reddy at ee.tamu.edu,
mallman at icir.org, eblanton at cs.purdue.edu
I-D Tag: draft-ietf-tcpm-tcp-dcr-07.txt
This document specifies Non-Congestion Robustness (NCR) for TCP. In
the absence of explicit congestion notification from the network, TCP
uses loss as an indication of congestion. One of the ways TCP
detects loss is using the arrival of three duplicate acknowledgments.
However, this heuristic 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 better disambiguate
true segment loss from segment reordering. This document specifies
the changes to TCP, as well as the costs and benefits of these
modifications. This memo 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. Distribution of
this memo is unlimited.
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