Path MTU Discovery for IP version 6
draft-ietf-6man-rfc1981bis-01

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Last updated 2016-03-17
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Network Working Group                                          J. McCann
Internet-Draft                             Digital Equipment Corporation
Obsoletes: 1981 (if approved)                                 S. Deering
Intended status: Standards Track                                 Retired
Expires: September 18, 2016                                     J. Mogul
                                           Digital Equipment Corporation
                                                          R. Hinden, Ed.
                                                    Check Point Software
                                                          March 17, 2016

                  Path MTU Discovery for IP version 6
                     draft-ietf-6man-rfc1981bis-01

Abstract

   This document describes Path MTU Discovery for IP version 6.  It is
   largely derived from RFC 1191, which describes Path MTU Discovery for
   IP version 4.  It obsoletes RFC1981.

Status of This Memo

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   This Internet-Draft will expire on September 18, 2016.

Copyright Notice

   Copyright (c) 2016 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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   to this document.  Code Components extracted from this document must

McCann, et al.         Expires September 18, 2016               [Page 1]
Internet-Draft           IPv6 Path MTU Discovery              March 2016

   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
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   than English.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Protocol Requirements . . . . . . . . . . . . . . . . . . . .   5
   5.  Implementation Issues . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Layering  . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.2.  Storing PMTU information  . . . . . . . . . . . . . . . .   7
     5.3.  Purging stale PMTU information  . . . . . . . . . . . . .  10
     5.4.  TCP layer actions . . . . . . . . . . . . . . . . . . . .  10
     5.5.  Issues for other transport protocols  . . . . . . . . . .  12
     5.6.  Management interface  . . . . . . . . . . . . . . . . . .  13
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Appendix A.  Comparison to RFC 1191 . . . . . . . . . . . . . . .  15
   Appendix B.  Changes Since RFC 1981 . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   When one IPv6 node has a large amount of data to send to another
   node, the data is transmitted in a series of IPv6 packets.  It is
   usually preferable that these packets be of the largest size that can
   successfully traverse the path from the source node to the
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