forward for some IPs and SNAT the rest

[Jose Luis Faria <jose@di.uminho.pt>]

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Hello,

I have a firewall inside my organization, but I want to preserve some 
source IPs,
and the rest must be SNATed:


host 1 - 192.168.0.1 ------------\
                                  \
                                   \ +--------------+
                                    \|  firewall    | 193.137.1.1 (ex.)    
host 2 - 192.168.0.2 ----------------|  with        |---------------> 
internet
                                    /|  iptables    |       |
                                   / +--------------+       |
                                  /  /                      | internal
host 3 - 192.168.0.3 ------------/  /                       |  routing
                                   /                        |
                                  /                         v
host 4 - 192.168.0.4 ------------/                        license server

the host 1 and host 2 must arrive to the license server with the original IP( 192.168.0.1/2) and the others host must be translated with SNAT into 193.137.1.1.


some help?


P.S: Now every hosts use the SNAT for all, but I want to exclude some of them.
-- 

   :)  cumprimentos
------------------------------------
         Jose Luis Faria
         Universidade do Minho
   /\    Escola de Engenharia
  /\/\   Departamento Informatica
         http://www.di.uminho.pt/~jose


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