Two Mail Server on One Public IP

Unanswered Question
Aug 29th, 2007
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Hi All,

- I have PIX 515 as my gateway.

- I wan to configure two different mail server on my private network. which is connected with my Cisco Switch.

is that possible to do NAT or PAT on PIX to forward the request to two different private ip address for same service. (Mail Servevr)

do let me know if any ody have idea.


Dhaval Tandel

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Jon Marshall Wed, 08/29/2007 - 23:25
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Hi Dhavel

It is possible if your mail servers are listening on different ports but i suspect they are both using the SMTP port (port 25) which means that the pix would have no way of distinguishing which private IP to translate to.



Anand Narayana Thu, 08/30/2007 - 03:54
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Hi Dhaval,

It is not possible unless you change the SMTP port on the Mail Server, but that is not really a good idea. if ur ready to change the port on the mail server on one of the PC, then you can do PAT for a single public IP address to 2 different Private IP address.

eg.> port 25> port 26

this kind of rule you can very well create on the PIX firewall.


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