This Internet-Draft is no longer active. Unofficial copies of old Internet-Drafts can be found here:
http://tools.ietf.org/id/draft-foo-v6ops-6rdmtu.
Abstract:
The 6rd tunnel MTU is currently recommended to be set to 1480. This
is to avoid IPv4 fragmentation within the tunnel, but requires the
6rd tunnel ingress interface 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, so dropping packets is considered
highly undesirable. 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 6rd MTU to 1500 bytes.
Authors:
Fred Templin <fltemplin@acm.org>
(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid)
datatracker.ietf.org