Okay, well from reading your post, you don't seem to understand how IPs really work. There are two ways of connecting a PC within your network. One way is using your WAN IP address (which is your router's IP address). Another way is using your LAN IP address(which each PC in your network has a different one).
I'm going to explain how to using your WAN IP address.
First, make sure you know your WAN IP address, which can be done on this website: http://www.whatismyip.com/
Second, make sure your ports are forward on your router, using the server's LAN IP address.
Third, setup your client on your PC (which will be connecting to the RO server) with the WAN IP.
Forth, everything should be working as should if you setup everything correctly.
If you are still having problems reply including a screen shot of your WAN IP, your server's LAN IP, your router's port forwarding page, and a copy of your client's clientinfo.xml.