All SMTP Traffic to One Internal IP

Unanswered Question
Jul 19th, 2007

I have a PIX515e routing SMTP traffic on x.x.x.67 to (Exchange server) and x.x.x.68 to (Secondary IP for the Exchange server). I just installed a Barracuda Spam Firewall and I need to forward x.x.x.67 and x.x.x.68 to it. What is the best way to accomplish this?

I have this problem too.
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d-mark Sun, 07/22/2007 - 00:12


one way that comes to my mind to accomplish this is to

- give the Spam Firewall 2 ip addresses (like and

- change the 2 NAT entries on the pix to

x.x.x.68 <->

x.x.x.68 <->

- and configure the Spam Firewall to forward the email to the appropriate exchange server.

The way to give the Spam Firewall only one internal ip address and then let both NAT entries on the pix point to that one wouldn't work as far as I know. Because in his case the way back to the internet isn't clear.




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