Portforwarding how?

[Kövesdán Gábor]

Hello,

sorry for the silly question, but I don't know where to look for. How 
can I set up a simple portforwarding? The machine is the same, the 
network interface and the IP address is the same, I just want to forward 
a privileged port to an unprivileged one so that the daemon don't have 
to run as root. I know there's mac_portacl, but I have some troubles 
with that, and I would avoid using that. An IPF or an IPFW-based 
solution would be nice.

Cheers,

Gabor Kovesdan