netdev - Re: Scaling Max IP address limitation

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Message-ID: <OF73D2E5B5.A62E8708-ON88257304.006BD251-88257304.006D56F9@us.ibm.com>
Date:	Sun, 24 Jun 2007 12:54:49 -0700
From:	David Stevens <dlstevens@...ibm.com>
To:	Kyle Moffett <mrmacman_g4@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, djones@...sove.com,
	LKML Kernel <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, netdev-owner@...r.kernel.org
Subject: Re: Scaling Max IP address limitation

> <Unrelated wishful thinking>
> I keep having hopeful dreams that one day netfilter will grow support 
> for cross-protocol NAT (IE: NAT a TCPv4 connection over TCPv6 to the 
> IPv6-only local web server, or vice versa).  It would seem that would 
> require a merged "xtables" program.

        You don't actually need it (at least for easy cases like that),
because IPv6 defines IPv4 mapped IPv6 addresses of the form
::ffff:a.b.c.d. These will generate IPv4 packets for a.b.c.d, from
a v6 socket.
        Unless you're using v6only binding (a sysctl option), you can
connect to v6-only servers using a v4 network and a v4 address of the
server. The peer address on those connections will show up as a v4
mapped address, and all the traffic will be v4, but the socket layer
is all v6.

                                                                +-DLS


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