After spending my entire day trying to figure this out and scouring the web for help I've finally given up and made a thread. My connection sharing is 'Off' (Bridge Mode) In all the tutorials I've seen no one seems to have a problem with it. But when you connection sharing is off you cannot access the 'Port Mapping' tab in the advanced settings. Changing connection sharing to 'Share a public IP address' shuts off my internet and Airport claims to have a 'Double Nat' error and suggests I turn connection sharing off. I believe I have successfully changed to a static IP address, although I'm still not sure. Can anyone enlighten me?