I have an HP 620 laptop with a Realtek RTL8191SE wireless ethernet card, and after I connect to my dorm's open wireless I can't access the internet. I receive my IP, default gateway and DNS addresses through DHCP, but I can't even ping these addresses.
However, when I connect to any other wireless network, it works like a charm. Wireless works too, but I think that's irrelevant.
The only difference I recognize between my dorm's network and any other is, that my dorm uses MAC filtering.
By the way, I can use this network with Windows 7 without any problems.
Any ideas, what could cause this problem?