ok, here is the deal, I will try to explain as best as possible.
Firstly the information, I live in a College hostel, and me any many of my friends have computers in the room. We all are using the Operating system Windows XP Pro SP2.
We needed to connect all out computers to each other, so we bought the cheapest possible HUB, a $12, 100mbps hub, and connected the computers together, everything is fine so far and the LAN is working fine, we had no internet connection in any of our computers. Recently I received permission from college to connect my computer to the LAN of the college, thereby giving me Internet access to, but I have only one Network card in the computer, So I plugged in the college LAN cable in the hub, and also mine in the hub, and thus I have internet, the only problem now is that everyone who is connected to the hub has internet access, all they have to do is assign themselves an IP, say, 192.168.xx.xx, and a default gateway 192.168.52.1 and default nameserver 192.168.52.1. This situation is however not acceptable, is it possible in any way that the other computers do not get access to the college LAN, The hub is not configurable at all as it is just the cheapest one.