Protocol Action: Computing TCP's Retransmission Timer to Proposed Standard
The IESG <iesg-secretary@ietf.org> Mon, 18 September 2000 11:06 UTC
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From: The IESG <iesg-secretary@ietf.org>
Subject: Protocol Action: Computing TCP's Retransmission Timer to Proposed Standard
Date: Mon, 18 Sep 2000 06:43:36 -0400
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The IESG has approved the Internet-Draft 'Computing TCP's Retransmission Timer' <draft-paxson-tcp-rto-01.txt> as a Proposed Standard. This document is the product of the Transport Area Working Group Working Group. The IESG contact persons are Allison Mankin and Scott Bradner. Technical Summary The Transmission Control Protocol (TCP) [RFC 793] uses a retransmission timer to ensure data delivery in the absence of any feedback from the remote data receiver. The duration of this timer is referred to as RTO (retransmission timeout). RFC 1122 specifies that the RTO should be calculated as described in Van Jacobson's 1988 Computer Communication Review paper on "Congestion Avoidance and Control" This document codifies the algorithm for setting the RTO. In addition, this document expands on the discussion in section 4.2.3.1 of RFC 1122 and upgrades the requirement of supporting the algorithm from a SHOULD to a MUST. RFC 2581 outlines the algorithm TCP uses to begin sending after the RTO expires and a retransmission is sent. This document does not alter the behavior outlined in RFC 2581 Thus this document defines the standard algorithm TCP senders are required to use to compute and manage their retransmission timer. Working Group Summary The proposed MIB was supported by the working group and no issues came up during IETF last-call. Protocol Quality This document was reviewed by Scott Bradner for the IESG. Note to RFC Editor: Please replace the first line of section 5 with the following An implementation MUST manage the retransmission timer(s) in such a way that a segment is never retransmitted too early, i.e. less than one RTO after the previous transmission of that segment. The following is the RECOMMENDED algorithm for managing the retransmission timer: