draft-ietf-6man-rfc1981bis-01.txt   draft-ietf-6man-rfc1981bis-02.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 18, 2016 J. Mogul Expires: October 29, 2016 J. Mogul
Digital Equipment Corporation Digital Equipment Corporation
R. Hinden, Ed. R. Hinden, Ed.
Check Point Software Check Point Software
March 17, 2016 April 27, 2016
Path MTU Discovery for IP version 6 Path MTU Discovery for IP version 6
draft-ietf-6man-rfc1981bis-01 draft-ietf-6man-rfc1981bis-02
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 18, 2016. This Internet-Draft will expire on October 29, 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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flow id a combination of a source address and a non-zero flow id a combination of a source address and a non-zero
flow label. flow label.
3. Protocol Overview 3. Protocol Overview
This memo describes a technique to dynamically discover the PMTU of a This memo describes a technique to dynamically discover the PMTU of a
path. The basic idea is that a source node initially assumes that path. The basic idea is that a source node initially assumes that
the PMTU of a path is the (known) MTU of the first hop in the path. the PMTU of a path is the (known) MTU of the first hop in the path.
If any of the packets sent on that path are too large to be forwarded If any of the packets sent on that path are too large to be forwarded
by some node along the path, that node will discard them and return by some node (regardless of whether it decrements the Hop Limit)
ICMPv6 Packet Too Big messages [ICMPv6]. Upon receipt of such a along the path, that node will discard them and return ICMPv6 Packet
message, the source node reduces its assumed PMTU for the path based Too Big messages [ICMPv6]. Upon receipt of such a message, the
on the MTU of the constricting hop as reported in the Packet Too Big source node reduces its assumed PMTU for the path based on the MTU of
message. the constricting hop as reported in the Packet Too Big message.
The Path MTU Discovery process ends when the node's estimate of the The Path MTU Discovery process ends when the node's estimate of the
PMTU is less than or equal to the actual PMTU. Note that several PMTU is less than or equal to the actual PMTU. Note that several
iterations of the packet-sent/Packet-Too-Big-message-received cycle iterations of the packet-sent/Packet-Too-Big-message-received cycle
may occur before the Path MTU Discovery process ends, as there may be may occur before the Path MTU Discovery process ends, as there may be
links with smaller MTUs further along the path. links with smaller MTUs further along the path.
Alternatively, the node may elect to end the discovery process by Alternatively, the node may elect to end the discovery process by
ceasing to send packets larger than the IPv6 minimum link MTU. ceasing to send packets larger than the IPv6 minimum link MTU.
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8. IANA Considerations 8. IANA Considerations
This document does not have any IANA actions This document does not have any IANA actions
9. References 9. References
9.1. Normative References 9.1. Normative References
[I-D.ietf-6man-rfc2460bis] [I-D.ietf-6man-rfc2460bis]
Deering, S. and B. Hinden, "Internet Protocol, Version 6 Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", draft-ietf-6man-rfc2460bis-03 (work (IPv6) Specification", draft-ietf-6man-rfc2460bis-04 (work
in progress), January 2016. in progress), March 2016.
[ICMPv6] Conta, A., Deering, S., and M. Gupta, Ed., "Internet [ICMPv6] Conta, A., Deering, S., and M. Gupta, Ed., "Internet
Control Message Protocol (ICMPv6) for the Internet Control Message Protocol (ICMPv6) for the Internet
Protocol Version 6 (IPv6) Specification", RFC 4443, DOI Protocol Version 6 (IPv6) Specification", RFC 4443, DOI
10.17487/RFC4443, March 2006, 10.17487/RFC4443, March 2006,
<http://www.rfc-editor.org/info/rfc4443>. <http://www.rfc-editor.org/info/rfc4443>.
9.2. Informative References 9.2. Informative References
[CONG] Jacobson, V., "Congestion Avoidance and Control", Proc. [CONG] Jacobson, V., "Congestion Avoidance and Control", Proc.
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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
02) Clarified in Section 3. that ICMP Packet Too Big should be
sent even if the node doesn't decrement the hop limit
01) Revised the text about PLPMTUD to use the word "path". 01) Revised the text about PLPMTUD to use the word "path".
01) Editorial changes. 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.
 End of changes. 7 change blocks. 
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