RFC 1981 (rfc1981) - Page 1 of 15

Path MTU Discovery for IP version 6

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Network Working Group                                          J. McCann
Request for Comments: 1981                 Digital Equipment Corporation
Category: Standards Track                                     S. Deering
                                                              Xerox PARC
                                                                J. Mogul
                                           Digital Equipment Corporation
                                                             August 1996


                  Path MTU Discovery for IP version 6

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

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.

Table of Contents

   1. Introduction.................................................2
   2. Terminology..................................................2
   3. Protocol overview............................................3
   4. Protocol Requirements........................................4
   5. Implementation Issues........................................5
   5.1. Layering...................................................5
   5.2. Storing PMTU information...................................6
   5.3. Purging stale PMTU information.............................8
   5.4. TCP layer actions..........................................9
   5.5. Issues for other transport protocols......................11
   5.6. Management interface......................................12
   6. Security Considerations.....................................12
   Acknowledgements...............................................13
   Appendix A - Comparison to RFC 1191............................14
   References.....................................................14
   Authors' Addresses.............................................15








McCann, Deering & Mogul     Standards Track
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