Ubuntu Port Forwarding using iptables

gistfile1.sh

# To see the list of forwarding routes:
sudo iptables -L -t nat

# To add a couple new routes:
ubuntu@ip-10-64-50-6:~$ sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 1336
ubuntu@ip-10-64-50-6:~$ sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 1337

# To delete a route (note that the rule number starts at 1!)
ubuntu@ip-10-64-50-6:~$ sudo iptables -t nat -D PREROUTING 3

# To make sure they're persistent (assuming you have iptables-persisent installed.)
ubuntu@ip-10-64-50-6:~$ sudo iptables-save > ./rules.v4 ; sudo cp ./rules.v4 /etc/iptables/rules.v4