First of all, a big thanks to Google and http://www.cyberciti.biz/tips/hacking-beetel-220x-adsl-router-broadcom-bcm6338.html
Once you are in (Ok, if you haven't opened that page till now, telnet to device, login as admin, enter 'sh' as the option), explore the device file system. Go to bin and do a echo *
You will find that there are iptables and a bunch of other applications that we can use. In the coming posts I will explain how to setup the iptable rules to forward a connection coming from outside to a host within your local network.
Well, this could have been achieved by setting up a DMZ or NAT from the webpage. Unfortunately, these did not work for me. This is the only reason that I am forced to try my luck with iptables.