Static NAT for my Mail Server

[tex52]

I have a PIX 525 IOS 6.3, I would like to have my Mail server send out as the same IP every time instead of pulling from the dynamic NAT pool. How can I achieve this?

 

[Arisap]

static (inside,outside) EXTERNALADDRESS INTERNALADDRESS netmask 255.255.255.255

Choose an EXTERNALADDRESS provided by your ISP that you are not using for any other translation. Static NAT's override dynamic NAT's

 

[Supergrrover]

With the above everything destined to the external address will be forwarded to the internal address. If you have only one public IP this is a problem. You can use policy NAT so only that port (25) gets used and other traffic will be fine.

static (inside,outside) tcp ExternalIP 25 InternalIP 25 netmask 255.255.255.255



Brent
Systems Engineer / Consultant
CCNP, CCSP