Setting internal traffic to an external ip

[scott0011]

Hi, hopefully this is an easy question. I have an ASA5505, we have a block of IPs from our ISP. We also have an Exchange server internally, I would like the Exchange server to send out emails through a specific external IP different from our primary one, i.e. the main external IP of the ASA is xxx.xxx.xxx.2 and I want emails to be seen as going out on xxx.xxx.xxx.4. How do I direct the traffic from the Exchange server's internal IP to the specific external IP?

Thanks,

Scott

 

[North323]

by using a one to one NAT

 

[scott0011]

Thanks for the suggestion, but I thought that just dealt with incoming traffic not outgoing. Also I forgot to mention we have 2 exchange boxes, one front end for email scanning and other duties, and a backend machine where the actual mailboxes reside. So email come in on the front-end and go out on the backend. So I need incoming emails to come in on the .4 IP to the front-end and go on the back-end to .4.

 

[Supergrrover]

Its been a bit but I think if you place a static one to one NAT to the backend server and then do a static PAT for port 25 to the frontend server. I will check my notes to be sure, but give it a try.



Brent
Systems Engineer / Consultant
CCNP, CCSP