Early Retransmit for TCP and SCTP

Document Type Expired Internet-Draft (individual in tsv area)
Last updated 2015-10-14 (latest revision 2008-06-25)
Stream IETF
Intended RFC status (None)
Expired & archived
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IESG IESG state Expired (IESG: Dead)
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Responsible AD Lars Eggert
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document proposes a new mechanism for TCP and SCTP that can be used to recover lost segments when a connection's congestion window is small. The "Early Retransmit" mechanism allows the transport to reduce, in certain special circumstances, the number of duplicate acknowledgments required to trigger a fast retransmission. This allows the transport to use fast retransmit to recover packet losses that would otherwise require a lengthy retransmission timeout.


Mark Allman (mallman@icir.org)

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