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RACK: a time-based fast loss detection algorithm for TCP

Document Type Replaced Internet-Draft (individual)
Expired & archived
Authors Yuchung Cheng , Neal Cardwell
Last updated 2016-07-06
Replaced by draft-ietf-tcpm-rack
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-tcpm-rack
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This Internet-Draft is no longer active.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:


This document presents a new TCP loss detection algorithm called RACK ("Recent ACKnowledgment"). RACK uses the notion of time, instead of packet or sequence counts, to detect losses, for modern TCP implementations that can support per-packet timestamps and the selective acknowledgment (SACK) option. It is intended to replace the conventional DUPACK threshold approach and its variants, as well as other nonstandard approaches.


Yuchung Cheng
Neal Cardwell

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