TCP Extensions for High Performance
draft-ietf-tcpm-1323bis-14

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Document Type Active Internet-Draft (tcpm WG)
Last updated 2013-05-23
Replaces draft-borman-1323bis
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TCP Maintenance (TCPM)                                         D. Borman
Internet-Draft                                       Quantum Corporation
Intended status: Standards Track                               B. Braden
Expires: November 24, 2013                        University of Southern
                                                              California
                                                             V. Jacobson
                                                           Packet Design
                                                   R. Scheffenegger, Ed.
                                                            NetApp, Inc.
                                                            May 23, 2013

                  TCP Extensions for High Performance
                       draft-ietf-tcpm-1323bis-14

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
   TCP options for scaled windows and timestamps.  The timestamps are
   used for two distinct mechanisms, RTTM (Round Trip Time Measurement)
   and PAWS (Protection Against Wrapped Sequences).

   This document updates and obsoletes RFC 1323.

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 November 24, 2013.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Borman, et al.          Expires November 24, 2013               [Page 1]
Internet-Draft     TCP Extensions for High Performance          May 2013

   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
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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 November 24, 2013               [Page 2]
Internet-Draft     TCP Extensions for High Performance          May 2013

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
     3.3.  The RTTM Mechanism . . . . . . . . . . . . . . . . . . . . 13
     3.4.  Updating the RTO value . . . . . . . . . . . . . . . . . . 15
     3.5.  Which Timestamp to Echo  . . . . . . . . . . . . . . . . . 15
   4.  PAWS - Protection Against Wrapped Sequence Numbers . . . . . . 18
     4.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . 18
     4.2.  The PAWS Mechanism . . . . . . . . . . . . . . . . . . . . 18
     4.3.  Basic PAWS Algorithm . . . . . . . . . . . . . . . . . . . 19
     4.4.  Timestamp Clock  . . . . . . . . . . . . . . . . . . . . . 21
     4.5.  Outdated Timestamps  . . . . . . . . . . . . . . . . . . . 23
     4.6.  Header Prediction  . . . . . . . . . . . . . . . . . . . . 23
     4.7.  IP Fragmentation . . . . . . . . . . . . . . . . . . . . . 25
     4.8.  Duplicates from Earlier Incarnations of Connection . . . . 25
   5.  Conclusions and Acknowledgements . . . . . . . . . . . . . . . 25
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 26
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