Engenheiro

Network Working Group Request for Comments: 1981 Category: Standards Track

J. McCann Digital Equipment Corporation 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 RFC 1981

Standards Track

[Page 1] August 1996

Path MTU Discovery for IPv6

1. Introduction When one IPv6 node has a large amount of data to