Port problems with Halo

[DPG Terik]

I am Playing Halo for the first time and am having problems getting servers to show up in multiplayer. I only get about 8-10 servers when my friends get 500.
I also can not host a game. I have researched this and found that I might have to do port forwarding. Does anyone know exactly how to set this up.
I use DMZ on my Linksys router for Metal of Honor and can host fine.
Halo updates through port 80
Listens on port 2302
Connects to host on 2303
I have gone to Linksys site and it talkes about port forwarding. But has no clear answer on how to set it up. "Or maybe I just can't figure it out".
These things I know. I just dont know how to go about how to set it up to work
Thanks for any help
Terik

I am using Windows XP Pro
AMd 1900+
ATI 9600 Pro
Linksys BEFW11S4 V.2