Oh....that sounds a bit complicated.
Well the reason...not is that I want a Dynamic IP. I just want to make the two computers of my room "networked", so I can use that to play LAN game between the two computers. As I mentioned before, I have two computers in a room, and I have a modem connect thru telephone line (DSL), and the modem is connected to a Wirless router with 4 ethernet port. Which my both computers are connected to each port.
Here is a basic drawing of how my computer are connected in my room: