Date: Fri, 19 Oct 2007 18:49:40 +0200 From: Max Laier <max@love2party.net> To: freebsd-net@freebsd.org Cc: "Marc G. Fournier" <freebsd@hub.org> Subject: Re: IPv6 <-> NAT <-> IPv4 ... possible? Message-ID: <200710191849.46335.max@love2party.net> In-Reply-To: <6C9CF4C3635197B3CBED0D78@ganymede.hub.org> References: <6C9CF4C3635197B3CBED0D78@ganymede.hub.org>
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On Friday 19 October 2007, Marc G. Fournier wrote:
> Could I hide an IPv6 network behind NAT? I don't know if that is even
> possible ... the IPv6 IPs would be private (equiv to 192.168.x.x) ...
> basically, none of the hosts behind NAT need a public IP, *but* I may
> end up with more then 256 hosts, so was wondering if using IPv6 behind
> the NAT would be 'simplier' ...
>
> If possible, pointers to docs to read would be appreciated ...
Possible - yes. Practical - no. There are a couple of techniques
available that can provide the functionality you are looking for. All of
them solve a subsection of the problem, but there is no - to my
knowledge - complete sollution.
The three main technologies are:
1) TRT (implemented through faith(4) / faithd(8))
2) Header translation (I don't know if we have this implemented anywhere)
3) (Transparent) application proxies
- there are patches for squid - IIRC
For 1 and 3 you have to run a AAAA to A translating DNS server. 2 is the
most "transparent" one, but I don't know if there is an implementation
available.
All in all, it's a PITA. Much, much worse than NAT. For the moment - if
you want your clients to do more than just surf webpages - you want NAT.
If it's only about surfing WWW you could try a (transparent) web proxy on
your dual stack router, but don't expect to find a lot of documentation!
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