Path MTU Discovery for IP version 6
RFC 8201

Document Type RFC - Internet Standard (July 2017; No errata)
Obsoletes RFC 1981
Also known as STD 87
Last updated 2017-07-14
Replaces draft-hinden-6man-rfc1981bis
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Ole Troan
Shepherd write-up Show (last changed 2017-01-27)
IESG IESG state RFC 8201 (Internet Standard)
Consensus Boilerplate Yes
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Responsible AD Suresh Krishnan
Send notices to "Ole Troan" <otroan@employees.org>
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                         J. McCann
Request for Comments: 8201                 Digital Equipment Corporation
STD: 87                                                       S. Deering
Obsoletes: 1981                                                  Retired
Category: Standards Track                                       J. Mogul
ISSN: 2070-1721                            Digital Equipment Corporation
                                                          R. Hinden, Ed.
                                                    Check Point Software
                                                               July 2017

                  Path MTU Discovery for IP version 6

Abstract

   This document describes Path MTU Discovery (PMTUD) for IP version 6.
   It is largely derived from RFC 1191, which describes Path MTU
   Discovery for IP version 4.  It obsoletes RFC 1981.

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 7841.

   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/rfc8201.

McCann, et al.               Standards Track                    [Page 1]
RFC 8201                 IPv6 Path MTU Discovery               July 2017

Copyright Notice

   Copyright (c) 2017 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

McCann, et al.               Standards Track                    [Page 2]
RFC 8201                 IPv6 Path MTU Discovery               July 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Protocol Requirements . . . . . . . . . . . . . . . . . . . .   7
   5.  Implementation Issues . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Layering  . . . . . . . . . . . . . . . . . . . . . . . .   8
     5.2.  Storing PMTU Information  . . . . . . . . . . . . . . . .   9
     5.3.  Purging Stale PMTU Information  . . . . . . . . . . . . .  11
     5.4.  Packetization Layer Actions . . . . . . . . . . . . . . .  12
     5.5.  Issues for Other Transport Protocols  . . . . . . . . . .  13
     5.6.  Management Interface  . . . . . . . . . . . . . . . . . .  14
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Appendix A.  Comparison to RFC 1191 . . . . . . . . . . . . . . .  17
   Appendix B.  Changes Since RFC 1981 . . . . . . . . . . . . . . .  17
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  19
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  19

McCann, et al.               Standards Track                    [Page 3]
RFC 8201                 IPv6 Path MTU Discovery               July 2017

1.  Introduction

   When one IPv6 node has a large amount of data to send to another
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