Port forwarding with iptables

cigarette · 03-05-2010, 05:57 AM

Say I have two IPs on the server as follows:

1.2.3.4 and 5.6.7.8

1.2.3.4 is listening on port 21 (FTP Daemon)

5.6.7.8 is listening on 55555 (Another FTP Daemon)

What iptables rule do I add so that port 21 to 5.6.7.8 is forwarded to port 55555 on 5.6.7.8? It should not affect the other IP.

troop · 03-05-2010, 10:06 AM

iptables -A PREROUTING -p tcp -m tcp --dport 21 -d 5.6.7.8 -j DNAT --to-destination 5.6.7.8:55555