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Evaluation of RFC 4138

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Markku Kojo , Kazunori Yamamoto , Max Hata , Pasi Sarolahti
Last updated 2007-11-19
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


Forward-RTO recovery (F-RTO) specified in RFC 4138 is an algorithm for detecting a spurious retransmission timeout with TCP and SCTP. This document describes the advantages of F-RTO and summarizes the experience in its implementations and the experiments conducted with it. By analyzing the implications of the spurious retransmission timeouts on the regular RTO recovery and Forward-RTO recovery algorithm, including a detailed corner case analysis, it shows that F-RTO does not have negative impact on the network when used with an appropriate response algorithm even in the rare cases where F-RTO falsely declares a retransmission timeout spurious. It concludes with a recommendation that F-RTO is to be advanced to the standards track.


Markku Kojo
Kazunori Yamamoto
Max Hata
Pasi Sarolahti

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)