RFC 3517 (rfc3517) - Page 1 of 13

A Conservative Selective Acknowledgment (SACK)-based Loss Recovery Algorithm for TCP

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Network Working Group                                         E. Blanton
Request for Comments: 3517                             Purdue University
Category: Standards Track                                      M. Allman
                                                            BBN/NASA GRC
                                                                 K. Fall
                                                          Intel Research
                                                                 L. Wang
                                                  University of Kentucky
                                                              April 2003


         A Conservative Selective Acknowledgment (SACK)-based
                    Loss Recovery Algorithm for TCP

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   This document presents a conservative loss recovery algorithm for TCP
   that is based on the use of the selective acknowledgment (SACK) TCP
   option.  The algorithm presented in this document conforms to the
   spirit of the current congestion control specification (RFC 2581),
   but allows TCP senders to recover more effectively when multiple
   segments are lost from a single flight of data.

Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in BCP 14, RFC 2119
   [RFC 2119].










Blanton, et al.             Standards Track
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