Firewall-1

[FW-1] How do we exclude some networks from a Nat rule.

Subject: [FW-1] How do we exclude some networks from a Nat rule.
From: Eric Janz <e.janz AT BARCELOVIAJES DOT COM>
To: FW-1-MAILINGLIST AT AMADEUS.US.CHECKPOINT DOT COM
Date: Fri, 26 Aug 2005 13:21:23 +0200
Hi,

I am trying to apply a Nat rule that only applies when the hosts went to 
the Internet. My problem is that I can not negate a cell in the address 
translation tab. I also tried to create a "Group with exclsuion" with 
success but it is not possible to select this group in an address 
translation rule.

My problem is that I need to NAT some hosts when they go to the Internet 
but they should appear with their original IP when they communicate with 
any other corporate network. I can not find the way to do that.

Sometimes I created "No-Nat" rules at top of the address translation tab 
but this time that also does not work because there are several servers 
from corporate networks which appear to that network with a Natted IP so I 
can not just deactivate NAT (in fact I just need to deactivate the source 
Nat because I want that the hosts appear to the servers with their 
original IP).

The rule should be as following:

        ORIGINAL PACKETS                                                
TRANSLATED PACKETS
Source          Destination Source              Destination

NetWorkA        Any excluding the known corporate networks Public IP 
Original

... other custom and automatic nat rules ...

Thanks a lot in advance for any advice,

Eric Janz 
Departamento de Sistemas
Grupo Barceló Viajes

C\ 16 de Julio, 75
07009 Polígono Son Castelló
Palma de Mallorca - Baleares
Tel.: +34 971 448030
Fax.: +34 971 436986 

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