From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jorge Davila <isaac@nicaraguarealestate.com>
Subject: Re: Static/Dynamic NAT Combination
Date: Fri, 28 May 2004 14:16:54 -0600
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References: <20040528175829.7b5a6da6.leslie.polzer@gmx.net>
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To: netfilter <netfilter@lists.netfilter.org>
Cc: Patrick Leslie Polzer <leslie.polzer@gmx.net>

Patrick Leslie Polzer wrote:

>Hello list,
>
>a short question...
>
>With this setup:
>
>Box A on Net A
>192.168.35.247
>
>Box B on Net B
>192.168.1.2
>
>Firewall/Router
>192.168.1.1/192.168.34.184/PPP address
>
>
>is it possible to NAT Box B statically (i.e. 1:1, except on specific
>ports, e.g. 6666/6667) and Box A dynamically (i.e. with flexible port numbers)?
>
>
>Many thanks,
>
>Leslie
>  
>
What do you want to do?

There is a link:
http://www.netfilter.org/documentation/HOWTO/NAT-HOWTO.html#toc6