ipfw and mail

[Bob Martin]

We don't redirect the mail. We just have the mail server listen on both 
ports. Much easier that way.

Bob Martin

Gustavo A. Baratto wrote:

>Hello guys,
>
>some of our users' ISPs don't allow them to use port 25, so they cannot use out mail server.
>
>I want to open a new port (2525) and forward all packets from 2525 to 25 so, they can use mail.
>
>I tried this in IPFW:
>0100 119649 44772439 allow tcp from any to me dst-port 25 keep-state
>0200      0        0 divert 25 ip from any to me dst-port 2525 keep-state
>0300 103075 35531648 allow ip from me to any keep-state
>0400     60     4530 deny log ip from any to any
>
>
>If I telnet directly to port 25, I can get the prompt, but if I telnet to port 2525, I get a connection refused.
>
>What should I do in ipfw to forward port 2525 to port 25 tranparently?
>
>Thanks
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