I want to share my internet connection from a Mac Pro (sans airport) through the second ethernet port to a airport express so a windows machine can connect over wireless my question is what ip shows to the "world" when I do this? Does my Mac Pro become a router and only its ip shows or does each machine in my wireless net work show on the network? Also if the Mac Pro is the only one that shows will the built in firewall protect the windows box behind it like it would if it was a router?