My parents just bought a mac in replace of a PC to use as the family computer. I have an xbox 360 and connect through my own computer in my room using a straightforward switch. My NAT for xbox is strict and I can't figure out how to fix it. I have an internet cord that goes to the switch and the switch is plugged in to my computer. Another cord that is plugged into the switch is than plugged into a Comcast router and that's plugged into the mac. So, I'm not sure which computer I'm supposed to be looking at to open my NAT settings. I tried installing UPnP on my computer but that made no difference. The mac is new and so I'm not really familiar with it. Appreciate some help!