Closing Ports on single server with multiple IP's?

[Lonnie Cumberland <lonnie@xxxxxxxxxxx>]

Hi All,

We have a server set up with multiple IP's aliased to it through eth0:1, 
eth0:2, etc.....

Each (aliased) IP currently has the same ports open on it as the others 
and I want to turn off some of the ports on all of the IP except for 
what IP is being used.

For example we have SMTP on port 25 which should be listening only on 2 
of our IP's and not on the rest of them as well.

How can I turn of various ports from listening on these IP's?

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Thanks,

Lonnie Cumberland