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RFC 6145, "IP/ICMP Translation Algorithm", April 2011

Note: This RFC has been obsoleted by RFC 7915

Source of RFC: behave (tsv)

Errata ID: 4090

Status: Reported
Type: Technical

Reported By: Fernando Gont
Date Reported: 2014-08-20

Section 6 says:

   1.  In the IPv4-to-IPv6 direction: if the MTU value of ICMPv4 Packet
       Too Big (PTB) messages is less than 1280, change it to 1280.
       This is intended to cause the IPv6 host and IPv6 firewall to
       process the ICMP PTB message and generate subsequent packets to
       this destination with an IPv6 Fragment Header.

It should say:

   1.  In the IPv4-to-IPv6 direction: if the MTU value of ICMPv4 Packet
       Too Big (PTB) messages is less than 1280, change it to 1280.
       This is intended to cause the IPv6 host and IPv6 firewall to
       process the ICMP PTB message.

Notes:

An ICMPv6 PTB message reporting an MTU equal to 1280 does not trigger IPv6 atomic fragments. Only ICMPv6 PTB < 1280 do.

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