draft-ietf-6man-rfc1981bis-00.txt   draft-ietf-6man-rfc1981bis-01.txt 
Network Working Group J. McCann Network Working Group J. McCann
Internet-Draft Digital Equipment Corporation Internet-Draft Digital Equipment Corporation
Obsoletes: 1981 (if approved) S. Deering Obsoletes: 1981 (if approved) S. Deering
Intended status: Standards Track Retired Intended status: Standards Track Retired
Expires: September 4, 2016 J. Mogul Expires: September 18, 2016 J. Mogul
Digital Equipment Corporation Digital Equipment Corporation
R. Hinden, Ed. R. Hinden, Ed.
Check Point Software Check Point Software
March 3, 2016 March 17, 2016
Path MTU Discovery for IP version 6 Path MTU Discovery for IP version 6
draft-ietf-6man-rfc1981bis-00 draft-ietf-6man-rfc1981bis-01
Abstract Abstract
This document describes Path MTU Discovery for IP version 6. It is This document describes Path MTU Discovery for IP version 6. It is
largely derived from RFC 1191, which describes Path MTU Discovery for largely derived from RFC 1191, which describes Path MTU Discovery for
IP version 4. It obsoletes RFC1981. IP version 4. It obsoletes RFC1981.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 4, 2016. This Internet-Draft will expire on September 18, 2016.
Copyright Notice Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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Nodes not implementing Path MTU Discovery use the IPv6 minimum link Nodes not implementing Path MTU Discovery use the IPv6 minimum link
MTU defined in [I-D.ietf-6man-rfc2460bis] as the maximum packet size. MTU defined in [I-D.ietf-6man-rfc2460bis] as the maximum packet size.
In most cases, this will result in the use of smaller packets than In most cases, this will result in the use of smaller packets than
necessary, because most paths have a PMTU greater than the IPv6 necessary, because most paths have a PMTU greater than the IPv6
minimum link MTU. A node sending packets much smaller than the Path minimum link MTU. A node sending packets much smaller than the Path
MTU allows is wasting network resources and probably getting MTU allows is wasting network resources and probably getting
suboptimal throughput. suboptimal throughput.
An extension to Path MTU Discovery defined in this document can be An extension to Path MTU Discovery defined in this document can be
found in [RFC4821]. It defines a method for Packetization Layer Path found in [RFC4821]. It defines a method for Packetization Layer Path
MTU Discovery (PLPMTUD) designed for use in environments in which MTU Discovery (PLPMTUD) designed for use over paths where delivery of
delivery of ICMP messages to a host are not assured. In this ICMP messages to a host is not assured. In this algorithm, the
algorithm, the proper MTU is determined by starting with small proper MTU is determined by starting with small packets and probing
packets and probing with successively larger packets. The bulk of with successively larger packets. The bulk of the algorithm is
the algorithm is implemented above IP, in the transport layer (e.g., implemented above IP, in the transport layer (e.g., TCP) or other
TCP) or other "Packetization Protocol" that is responsible for "Packetization Protocol" that is responsible for determining packet
determining packet boundaries. boundaries.
2. Terminology 2. Terminology
node a device that implements IPv6. node a device that implements IPv6.
router a node that forwards IPv6 packets not explicitly router a node that forwards IPv6 packets not explicitly
addressed to itself. addressed to itself.
host any node that is not a router. host any node that is not a router.
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MTU plateau tables not needed because there are no old-style MTU plateau tables not needed because there are no old-style
messages messages
Appendix B. Changes Since RFC 1981 Appendix B. Changes Since RFC 1981
This document has the following changes from RFC1981. Numbers This document has the following changes from RFC1981. Numbers
identify the Internet-Draft version that the change was made.: identify the Internet-Draft version that the change was made.:
Working Group Internet Drafts Working Group Internet Drafts
01) Revised the text about PLPMTUD to use the word "path".
01) Editorial changes.
00) Added text to discard an ICMP Packet Too Big message 00) Added text to discard an ICMP Packet Too Big message
containing an MTU less than the IPv6 minimum link MTU. containing an MTU less than the IPv6 minimum link MTU.
00) Revision of text regarding RFC4821. 00) Revision of text regarding RFC4821.
00) Added R. Hinden as Editor to facilitate ID submission. 00) Added R. Hinden as Editor to facilitate ID submission.
00) Editorial changes. 00) Editorial changes.
Individual Internet Drafts Individual Internet Drafts
 End of changes. 6 change blocks. 
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