I had to install a PIX on a customer network this week.
The LAN was already running and the customer asked me to don�t change the public
IP�s of their servers. So I configured the PIX to work without NAT. The
configuration I thought was to put private ip address in the outside lan and use
the old ip address of the access router in the inside ethernet of the PIX, so
the servers continue using the same default gateway.
The problem was that this didn�t work. When i tried to make a traceroute from
one of the servers, the packets just went 1 hop(the router Eth. interface) and
then died. I tried changing the IP�s of the outside lan to public IP�s, and then
it works fine.

I hope you understand what I tried to say.
Now my question is, is possible to configure a PIX with public IP address inside
and private ip address outside without using NAT? It�s supposed to work like
this way, becouse when i try to reach the internet from the inside it�s supposed
that i�m going outside with a public source address, so why this doesn�t work?
You may think I�m crazy doing this kind of configuration, but my customer asked
me to do it this way, i couldn�t convince him...

Thanks in advance.
Matias Christensen.
Networking Specialist
Equant Argentina.
+54-11-4349-0824


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