A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : 6rd Tunnel MTU
Author : Fred L. Templin
Filename : draft-foo-v6ops-6rdmtu-02.txt
Pages : 7
Date : 2014-01-30
Abstract:
The tunnel MTU on 6rd Provider Edge (PE) and Consumer Edge (CE)
routers is currently recommended to be set to 1480. This is to avoid
IPv4 fragmentation within the tunnel, but requires the tunnel ingress
to drop any IPv6 packet larger than 1480 bytes and return an ICMPv6
Packet Too Big (PTB) message. Concerns for operational issues with
both IPv4 and IPv6 Path MTU Discovery point to the possibility of
MTU-related black holes when a packet is dropped due to an MTU
restriction somewhere in the Internet. Fortunately, the "Internet
cell size" is 1500 bytes (i.e., the minimum MTU configured by the
vast majority of links in the Internet) so if the 6rd PE router can
set a tunnel MTU of at least 1500 bytes the MTU issues are
alleviated. This document specifies methods that can be employed to
support these larger sizes.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-foo-v6ops-6rdmtu/
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-foo-v6ops-6rdmtu-02
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-foo-v6ops-6rdmtu-02
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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