{help}Connect 2 servers under a router

Hello have not found any specific info on how to connect 2 servers to one login server "under a router".

Have made my new hexid for the second server, and tried examples in the forum but still can not connect 2nd server to my 1st server login under router. First server works no problem...

Do I need to port forword new ports on second server ? 7778 etc? Do I need to change my patch to allow people to connect to 2nd server?

Please help soon because will be going out of the country in a few days....

Thanks