A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Generic Tunnel MTU Determination
Author(s) : Fred L. Templin
Filename : draft-generic-v6ops-tunmtu-00.txt
Pages : 8
Date : 2012-05-22
The IPv6-over-IPv4 tunnel MTU as defined by "Basic Transition
Mechanisms for IPv6" is currently recommended to be set to 1480 or
less when static MTU determination is used. 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. Fortunately, the "Internet cell size" is 1500 bytes,
i.e., the minimum MTU configured by the vast majority of links in the
Internet. This document therefore presents a method to boost the
tunnel MTU to 1500 bytes.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-generic-v6ops-tunmtu-00.txt
Internet-Drafts are also available by anonymous FTP at:
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This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-generic-v6ops-tunmtu-00.txt
The IETF datatracker page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-generic-v6ops-tunmtu/
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