IPFW's forwarding feature can be used for transparent proxying on another machine. To do it on the same machine, you'd probably need to use NAT.
Nate > I haven't actually tried this, but shouldn't it be possible > to use IPFW's forwarding feature for that? For example, > let sendmail run on port 2500 and then add ipfw fwd rules > to forward between ports 2500 and 25. > > Regards > Oliver To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message