A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : ISATAP Tunnel MTU
Author(s) : Fred L. Templin
Filename : draft-bar-v6ops-ismtu-00.txt
Pages : 6
Date : 2012-05-18
The ISATAP tunnel MTU is currently recommended to be set to 1480 or
less. This is to avoid IPv4 fragmentation within the tunnel, but
requires the ISATAP 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 ISATAP MTU to 1500 bytes.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-bar-v6ops-ismtu-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-bar-v6ops-ismtu-00.txt
The IETF datatracker page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-bar-v6ops-ismtu/
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