TCP Extensions for High Performance
RFC 7323

 
Document Type RFC - Proposed Standard (September 2014; No errata)
Obsoletes RFC 1323
Last updated 2014-09-19
Replaces draft-borman-1323bis
Stream IETF
Formats plain text pdf html
Stream WG state Submitted to IESG for Publication
Consensus Unknown
Document shepherd Pasi Sarolahti
Shepherd write-up Show (last changed 2013-12-15)
IESG IESG state RFC 7323 (Proposed Standard)
Telechat date
Responsible AD Martin Stiemerling
Send notices to tcpm-chairs@ietf.org, draft-ietf-tcpm-1323bis@ietf.org
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                         D. Borman
Request for Comments: 7323                           Quantum Corporation
Obsoletes: 1323                                                B. Braden
Category: Standards Track              University of Southern California
ISSN: 2070-1721                                              V. Jacobson
                                                            Google, Inc.
                                                   R. Scheffenegger, Ed.
                                                            NetApp, Inc.
                                                          September 2014

                  TCP Extensions for High Performance

Abstract

   This document specifies a set of TCP extensions to improve
   performance over paths with a large bandwidth * delay product and to
   provide reliable operation over very high-speed paths.  It defines
   the TCP Window Scale (WS) option and the TCP Timestamps (TS) option
   and their semantics.  The Window Scale option is used to support
   larger receive windows, while the Timestamps option can be used for
   at least two distinct mechanisms, Protection Against Wrapped
   Sequences (PAWS) and Round-Trip Time Measurement (RTTM), that are
   also described herein.

   This document obsoletes RFC 1323 and describes changes from it.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7323.

Borman, et al.               Standards Track                    [Page 1]
RFC 7323           TCP Extensions for High Performance    September 2014

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Borman, et al.               Standards Track                    [Page 2]
RFC 7323           TCP Extensions for High Performance    September 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  TCP Performance . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  TCP Reliability . . . . . . . . . . . . . . . . . . . . .   5
     1.3.  Using TCP options . . . . . . . . . . . . . . . . . . . .   6
     1.4.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   7
   2.  TCP Window Scale Option . . . . . . . . . . . . . . . . . . .   8
     2.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .   8
     2.2.  Window Scale Option . . . . . . . . . . . . . . . . . . .   8
     2.3.  Using the Window Scale Option . . . . . . . . . . . . . .   9
     2.4.  Addressing Window Retraction  . . . . . . . . . . . . . .  10
   3.  TCP Timestamps Option . . . . . . . . . . . . . . . . . . . .  11
     3.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .  11
     3.2.  Timestamps Option . . . . . . . . . . . . . . . . . . . .  12
   4.  The RTTM Mechanism  . . . . . . . . . . . . . . . . . . . . .  14
     4.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .  14
     4.2.  Updating the RTO Value  . . . . . . . . . . . . . . . . .  15
     4.3.  Which Timestamp to Echo . . . . . . . . . . . . . . . . .  16
   5.  PAWS - Protection Against Wrapped Sequences . . . . . . . . .  19
     5.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .  19
     5.2.  The PAWS Mechanism  . . . . . . . . . . . . . . . . . . .  19
     5.3.  Basic PAWS Algorithm  . . . . . . . . . . . . . . . . . .  20
     5.4.  Timestamp Clock . . . . . . . . . . . . . . . . . . . . .  22
     5.5.  Outdated Timestamps . . . . . . . . . . . . . . . . . . .  24
     5.6.  Header Prediction . . . . . . . . . . . . . . . . . . . .  25
     5.7.  IP Fragmentation  . . . . . . . . . . . . . . . . . . . .  26
     5.8.  Duplicates from Earlier Incarnations of Connection  . . .  26
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