ipfw and mail

[Ondra Holecek]

On Friday 25 June 2004 20:00, 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
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
this line does something other
try to use this:
 ipfw delete 200
 ipfw add 200 fwd localhost:25 tcp from any to me 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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