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After a half serious post to the IETF list I decided to write a quick
draft about the following:
This document describes an extension to the mechanism outlined in RFC
2765 that allows IPv4 hosts to communicate with IPv6 hosts through a
protocol translation device with full IPv6 compatibility.
For this purpose, a new header is inserted between the IP header and
the payload protocol such as TCP and UDP. The new header contains the
bits truncated from the IPv6 address when the IPv6 address is
translated into an IPv4 address in the 240.0.0.0/4 (class E) range.
(I have no patience with the IETF tools right now, will retry that
The idea is that hosts with IPv4 connectivity get to talk to IPv6
hosts without anything NAT-like getting in the way. However, it does
require some changes on the IPv4 side, but these can be deployed
incrementally. The assumption is that these changes would be easier
to deploy than a full IPv6 transition.
I would really like some feedback on whether this is something useful
that deserves more attention or not.