|Your 2wire device is a combo unit that already contains a router. You even say you're created a port forward on it. You couldn't do that if it weren't a router.|
Check your port forward. This is the most common place people make a mistake when attempting to allow remote access. Since RDC uses port 3389 your forward should look as follows:
forward port 3380 to [IP of target PC]
where [IP of target PC] is the LAN IP address of the PC you wish to RDC in to.
NOTE: You will need to allow remote connections on the target PC and you will need to know your external IP. When attempting to remote in, you will run RDC on whatever device you're using and type in the external IP of the router. If your forward is done correctly and you've allowed remote connections on the target PC, you should connect.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.