We want on host 11.1.1.111 connections on port 11111 to be forwareded to host 2.2.22.222 to port 2222.

On host 11.1.1.111 install:

poldek:/all-avail> install portfwd-0.29-1.i686 

Edit '/etc/portfwd.cfg' and add:

/* Comment what kind of forward it is */
 tcp { 11111 { => 2.2.22.222:2222 } }

Enable incoming connections to 11.1.1.111:11111 if you are using iptables firewall:

iptables -I INPUT -p tcp --dport 11111 -j ACCEPT

and perhaps outgoing connections to 2.2.22.222:2222.

Start 'service portfwd', set it to start up permanently ('ntsysv').

Check forwarded traffic going:

tcpdump -i eth1 host 2.2.22.222 and port 2222