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 From:  Chris Buechler <cbuechler at gmail dot com>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] VPN configuration & NAT
 Date:  Fri, 26 Aug 2005 18:55:10 -0400
On 8/26/05, Philippe Lang <philippe dot lang at attiksystem dot ch> wrote:
> Hi,
> 
> I'm trying to replace my actual Lightning firewall with a Soekris 4801
> (m0n0wall 1.11), and I have a small problem:
> 
> My network is 10.0.0.0/8, and the remote network is 172.26.26.0/24.
> 
> The problem is that the remote network already has a VPN with another
> 10.0.0.0/8 network.
> 
> My solution with the Lightning was to map my 10.0.0.0/8 to the
> 172.31.1.0/24 network, and create a VPN between 172.26.26.0/24 and
> 172.31.1.0/24 networks, with a "mapto/source" and a "mapto/destination"
> on my Lightning, like:
> 
> Source           Destination       Cmd     Translation    Type
> ----------------------------------------------------------------
> 10.0.0.111/32    172.26.26.0/24    mapto   172.31.1.111   Source
> 172.26.26.0/24   172.31.1.111/32   mapto   10.0.0.111     Destination
> 

Try advanced outbound NAT to setup the same.  I've never tried it for
something like this specifically, but it might work.  Report back if
you have any success or not.

-Chris