OK. Why are you sharing the Mac Mini's connection? Why not just hook the netgear router up to your DSL/Cable modem? I don't think the Mac Mini will really function well as a router w/o special software. You are also operating in a double NAT environment here as well. But first I am curious about why you are attempting it this way?

Slinging w/ Catcher, ProHD, Pro, Solo, AV, and a Classic. 3 Replays, Roku Photobridge and a Roku Soundbridge, AppleTV, Vudu, and TivoHD. www.na9d.net Follow me on Twitter

Oh, my gosh. You effectively have 3 routers involved here. This is way too complicated. My recommendation: Buy a SlingLink Turbo...

You could probably take your Linksys wireless router and load DD-WRT or Tomato on it and set it up in client mode and then use the Netgear as your main router (ie: switch the places of the two routers). You aren't going to be able to easily port forward through the Mac Mini.

Slinging w/ Catcher, ProHD, Pro, Solo, AV, and a Classic. 3 Replays, Roku Photobridge and a Roku Soundbridge, AppleTV, Vudu, and TivoHD. www.na9d.net Follow me on Twitter