I’ve got a UT300R2U ADSL router that has a really bad web based UI that did not let me setup some basic port-forwarding rules.

Thankfully the router was a linux based router with telnet installed on it. I was able to log in using the admin user, and set the following iptable rules:


#iptables -I PREROUTING -t nat -p tcp --dport 8080 -i ppp_0_35_1 -j DNAT --to 192.168.1.11:8080
#iptables -I FORWARD -p tcp -d 192.168.1.11 --dport 8080 -i ppp_0_35_1 -o br0 -j ACCEPT
#iptables -I FORWARD -p tcp -s 192.168.1.11 --sport 8080 -i br0 -o ppp_0_35_1 -j ACCEPT

the IP address 192.168.1.11 is the webserver that’s hosting tomcat on port 8080.