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 From:  Thomas =?ISO-8859-1?Q?Kolst=F8?= <thomas at kolsto dot no>
 To:  Thomas <thomas at kenshi dot dk>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] 2 mailservers on the inside
 Date:  Mon, 21 Feb 2005 15:55:23 +0100
On Mon, 2005-02-21 at 14:24 +0100, Thomas wrote:
> Hey,
> I've got two Postfix servers in my lan:
> server1 has IP
> server2 has IP
> Both servers are sitting behind a m0n0wall router with two WAN 
> interfaces. Emails designated for WAN1 is NAT'ed to server1 and email 
> designated to WAN2 is NAT'ed to server2.
> This works like a charm - until server1 tries to send an email to 
> server2, or vice-versa. I can see in my logs that server1 obtains the 
> correct WAN IP for server2, but it is refused (by m0n0wall?) to connect.
> Now the optimal solution would be to create a hosts file on each server, 
> telling them which domains are local, but seeing as I've had no luck 
> getting Postfix to read this hosts file, I'll settle for the next best: 
> opening up my m0n0wall for such a connection.
> But how to do it? I simply have NO idea as to how I can create such a 
> firewall/NAT configuration.
> If some kind soul could help me out, I would really appreciate it.
> Thank you,
> Thomas
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You need to configure some sort of split-horizon dns as you mention for
this to work with m0n0 since it does not currently support accessing
NATed services from the lan.

See http://m0n0.ch/wall/docbook/faq-lannat.html for more info, and
search this list for workarounds/solutions..

Thomas Kolstø <thomas at kolsto dot no>