First, I suck at this, need help. 
This is my setup right now.
I have a wireless router, my mac is connected with Airport and I have an ethernet from my mac to the 360. Basically I want to share the connection between my mac and the 360.
What I did was follow a tutorial:
Choose Apple > System Preferences, and then click Sharing.
Select Internet Sharing.
Choose a network service from the “Share your connection from” pop-up menu, Ethernet.
Then in the network preferences I choose the airport connection as the first, and ethernet behind it.
The xbox is noticing the connection but don´t know why it fails in the IP test. The mac has a fixed IP, and I set a fixed IP for the ethernet connection also. Any suggestions in how to pass the IP test? :-/ I already try with automatic DHCP and manual DHCP but no luck…
