TCP Extensions for High Performance
draft-ietf-tcpm-1323bis-03

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Document Type Active Internet-Draft (tcpm WG)
Last updated 2012-07-11
Replaces draft-borman-1323bis
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TCP Maintenance (TCPM)                                         D. Borman
Internet-Draft                                       Quantum Corporation
Intended status: Standards Track                               B. Braden
Expires: January 12, 2013                         University of Southern
                                                              California
                                                             V. Jacobson
                                                           Packet Design
                                                   R. Scheffenegger, Ed.
                                                            NetApp, Inc.
                                                           July 11, 2012

                  TCP Extensions for High Performance
                       draft-ietf-tcpm-1323bis-03

Abstract

   This memo presents a set of TCP extensions to improve performance
   over large bandwidth*delay product paths and to provide reliable
   operation over very high-speed paths.  It defines TCP options for
   scaled windows and timestamps, which are designed to provide
   compatible interworking with TCP's that do not implement the
   extensions.  The timestamps are used for two distinct mechanisms:
   RTTM (Round Trip Time Measurement) and PAWS (Protection Against
   Wrapped Sequences).  Selective acknowledgments are not included in
   this memo.

   This memo 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.

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   This Internet-Draft will expire on January 12, 2013.

Copyright Notice

Borman, et al.          Expires January 12, 2013                [Page 1]
Internet-Draft     TCP Extensions for High Performance         July 2012

   Copyright (c) 2012 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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Borman, et al.          Expires January 12, 2013                [Page 2]
Internet-Draft     TCP Extensions for High Performance         July 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  TCP Performance  . . . . . . . . . . . . . . . . . . . . .  4
     1.2.  TCP Reliability  . . . . . . . . . . . . . . . . . . . . .  6
     1.3.  Using TCP options  . . . . . . . . . . . . . . . . . . . .  9
   2.  TCP Window Scale Option  . . . . . . . . . . . . . . . . . . . 10
     2.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . 10
     2.2.  Window Scale Option  . . . . . . . . . . . . . . . . . . . 10
     2.3.  Using the Window Scale Option  . . . . . . . . . . . . . . 11
     2.4.  Addressing Window Retraction . . . . . . . . . . . . . . . 13
   3.  RTTM -- Round-Trip Time Measurement  . . . . . . . . . . . . . 13
     3.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . 13
     3.2.  TCP Timestamps Option  . . . . . . . . . . . . . . . . . . 14
     3.3.  The RTTM Mechanism . . . . . . . . . . . . . . . . . . . . 15
     3.4.  Which Timestamp to Echo  . . . . . . . . . . . . . . . . . 17
   4.  PAWS -- Protection Against Wrapped Sequence Numbers  . . . . . 19
     4.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . 19
     4.2.  The PAWS Mechanism . . . . . . . . . . . . . . . . . . . . 20
       4.2.1.  Basic PAWS Algorithm . . . . . . . . . . . . . . . . . 21
       4.2.2.  Timestamp Clock  . . . . . . . . . . . . . . . . . . . 23
       4.2.3.  Outdated Timestamps  . . . . . . . . . . . . . . . . . 24
       4.2.4.  Header Prediction  . . . . . . . . . . . . . . . . . . 25
       4.2.5.  IP Fragmentation . . . . . . . . . . . . . . . . . . . 26
     4.3.  Duplicates from Earlier Incarnations of Connection . . . . 27
   5.  Conclusions and Acknowledgements . . . . . . . . . . . . . . . 27
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 28
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