I am looking for a solution that would require any computer user on a LAN to enter a password in order to access the Internet.
We do not want to restrict it at each individual computer because people have in the past brought in their personal laptops, etc. and plugged them into the network defeating that technique.
It is a small network. There is no server the users log in to, just about 8 legitimate workstations. The problem occurs mostly after hours or on 2nd and 3rd shifts.
Thanks in advance.