Xbox Live via Powerbook: Nat moderate

Hey,

Anyone help me sort my NAT out for my xbox 360. I have my xbox connected via my powerbook wireless and i connect to xbox fine but with a moderate NAT.

I've forwarded the ports on my router but still moderate NAT. I assume i have to forward the ports for my mac's wireless connection?

Advice?

Trust me on this - life will be a LOT easier for you with a cheap wi-fi router. I have never seen anyone actually get a decent, stable and reliable connection going the ad hoc route with a laptop (running any OS).