The wifi? I just got a Tomato-compatible router, there's a section in Tomato where you specify the networks you want. The connections are a few iptables rules, I could write a post at some point.

EDIT: Turns out I don't remember which settings were set by me and which ones the router added by itself. If you have a Tomato router and would like to help me replicate the setup so I can write the post, send me an email (email in profile)!