Quote Originally Posted by Stephen
Now this description does not sound right if it is just a hub and not a router then you should have a second network card in one of the machines to share the connection.
I don't know about this case but it doesn't always have to be that way. My ISP serves me 5 DHCP addresses through the bridged connection so when I don't have more machines than that simultaneously connected I don't have to use a router. Many modems also have a built-in NAT router (mine does but I don't use that feature) Anyway, if that (the router missing) is the problem in this case it could be tested by telling the other machines to release their addresses and shutting them down.