Xbox live

first of all does anyone here plays on xbox live halo3, modernwarfare 2 ? Now my question to you folks i've been using ptcl 1 mb connection to play xbox live my connection strength on xbox is not as good as wi-tribe which i recently bought even though wi-tribe i've is on 512 speed. So is there something i need to do with my router settings ? Also if you guys can help me out port settings it always shows me moderate while my friends abroad have open, thanks to you all !