i am WELL lost! my situation: i don't have a wireless router. i have a DSL modem connected to my iMac via ethernet running Leopard. on my iMac i turn on "Internet Sharing" (with password protected airport options) so that i can access the internet using my iPod Touch and Nintendo Wii. i just bought a MacBook that i can also use on this network. however, i can only "surf the web" since my iMac's built-in AirPort card is only forwarding TCP ports 80 and 443. but i need to forward these ports: 1. iChat = TCP 5298, 5190-5200 2. FTP = TCP 20-21 apparently suffering from a "Double NAT"(??) as my MacBook's automatically assigned IP is 10.0.2.5. how can i forward these ports?