Hi, I recently moved into a new apartment and am using a new internet service provided in the area. I don't know how the network works, exactly, but I know that there is no firewall on it, but it uses NAT and DHCP. I have my Mac OS X Firewall on, and all the advanced settings on, but when I try out some firewall tests (grc/Shield's Up!) it scans my external IP (73.xxx.xxx.xxx) and shows that almost none of my ports are stealthed, shows most closed, and a couple open ports. My internal IP is different, a 10.xxx.xxx.xxx IP. I just setup my wireless router, and it shows the same results for the Shield's Up! test, with the same external IP. My internal IP now shows the typical 192.xxx.xxx.xxx IP. Is this not scanning my computer's actual ports? Is there a host computer on my network or something that it is scanning? Why aren't they showing up as stealthed, etc.? Back at my old place, under comcast, while using the same router, and mac firewall, it showed all my ports stealthed and whatnot. And, yeah, yeah, I know we are "safe" using macs on the net, but I wanted to know if anyone knows the deal with this discrepancy?