How do I force outgoing SMTP through a specific IP?

[CubbyFifi]

I originally posted this question in the TCPIP group and someone suggested that I post it here.

I use a CISCO 1811/K9 router and have a block of IP addresses from my ISP assigned to my office.

All is working fine but I want all of my Exchange server traffic assigned to one of the IP addresses. I currently have a NAT setup for the incoming but I need to know how to setup the outgoing.

Here is an example:

My primary static IP is 1.2.3.4 and my block is 5.6.7.8-10. I want all outgoing SMTP from my Exchange server to go through 5.6.7.9.

Any help you can offer is appreciated.

 

[unclerico]

you need a static nat such as:

ip nat inside static <exchange_priv_ip> 5.6.7.9

just note that you need to adjust your ACL to permit only smtp inbound to this host because this will expose all open ports on the host to the outside

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