TLink Router - Unable To Locate A Host?

I have new TP_LINK router, Model No. TL-WR1043N / TL-WR1043ND

And Its working fine most of the time but my problem or question is this, I play the WII online and its wireless through the router.I have a friend that is local in my town and we try to play online and it will never let us team up, and if we try it never lets us assign a host. I can play otherwise when i connect and search for a game in progress but if I send him an invite it will not let us team up and either host a game or join a game.

Ive done some research and Ive went in and add my WIIS MAC address into the DHCP and assigned it an IP address in the router and the WII, and it worked at first, we finally were able to join into a game on the same team, but its still not letting one of us host or, it keeps telling us unable to locate a host. Im wondering if I should put his MAC address in my DHCP and assign him a IP address?