TCP Extensions for High Performance
draft-ietf-tcpm-1323bis-19

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Last updated 2014-03-03 (latest revision 2014-01-24)
Replaces draft-borman-1323bis
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TCP Maintenance (TCPM)                                         D. Borman
Internet-Draft                                       Quantum Corporation
Obsoletes: 1323 (if approved)                                  B. Braden
Intended status: Standards Track                  University of Southern
Expires: July 28, 2014                                        California
                                                             V. Jacobson
                                                            Google, Inc.
                                                   R. Scheffenegger, Ed.
                                                            NetApp, Inc.
                                                        January 24, 2014

                  TCP Extensions for High Performance
                       draft-ietf-tcpm-1323bis-19

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, PAWS (Protection Against Wrapped
   Sequences) and RTTM (Round Trip Time Measurement), that are also
   described herein.

   This document obsoletes RFC1323 and describes changes from it.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on July 28, 2014.

Copyright Notice

Borman, et al.            Expires July 28, 2014                 [Page 1]
Internet-Draft     TCP Extensions for High Performance      January 2014

   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
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   publication of this document.  Please review these documents
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   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.            Expires July 28, 2014                 [Page 2]
Internet-Draft     TCP Extensions for High Performance      January 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  . . . . . . . . . . . . . . . . . . . . 12
     3.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . 12
     3.2.  Timestamps option  . . . . . . . . . . . . . . . . . . . . 12
   4.  The RTTM Mechanism . . . . . . . . . . . . . . . . . . . . . . 15
     4.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . 15
     4.2.  Updating the RTO value . . . . . . . . . . . . . . . . . . 16
     4.3.  Which Timestamp to Echo  . . . . . . . . . . . . . . . . . 16
   5.  PAWS - Protection Against Wrapped Sequence Numbers . . . . . . 20
     5.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . 20
     5.2.  The PAWS Mechanism . . . . . . . . . . . . . . . . . . . . 20
     5.3.  Basic PAWS Algorithm . . . . . . . . . . . . . . . . . . . 21
     5.4.  Timestamp Clock  . . . . . . . . . . . . . . . . . . . . . 23
     5.5.  Outdated Timestamps  . . . . . . . . . . . . . . . . . . . 25
     5.6.  Header Prediction  . . . . . . . . . . . . . . . . . . . . 25
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