Re: comments on draft-itojun-v6ops-v4mapped-harmful-00.txt

[Jun-ichiro itojun Hagino <itojun@iijlab.net>]

>> 	where this recommendation is documented?  i believe nowhere.
>
>I think this is the core of the discussion. My take is that
>it should be documented somewhere that if one one implements
>basic API semantic, the kernel should drop incoming packets with
>IPv4-mapped src address, but if one decides to accept them,
>then when the same kernel is asked to send an IPv4-mapped
>address, it should sent it on the wire as an IPv6 address.
>
>The fist behavior is fine for dual stack host, the second
>for IPv6-only hosts.

	for each host, the above story may make sense.  however, for a operator
	of a given site (like sun.com) there will be IPv4-only nodes, IPv6-only
	nodes (with SIIT support) and IPv4/v6 dual stack nodes.  if we are
	to add the above sentences somewhere and leave IPv4 mapped address
	on wire be legal, it will be unmanageable.

itojun