Restricting internet in one computer lab but retaining server access
Once again I need your zen like experience people.
There are 8 computer labs/rooms in the college. We have a Server 2008R2 domain controller for AD, DHCP and DNS and Untangle Lite running on another HP server doing the filtering. The Untangle boxes takes a feed from the internet router into one network card and is connected to the main network through a second network card.
There is an exam on Saturday morning and the students will need to save data to their home folders for later collection by the teacher and they will also need to print to the lab printer which is done through the server.
However, they can't have internet access.
Is there a way through group policy to isolate this computer lab so it doesn't have internet access but does have normal domain/network access while leaving the other labs alone? This is a part time course exam so it is the only one on in the college at that time. I know I could just unplug the router but the daytime/fulltime exams are coming up in a couple of weeks and I will have to do the same for some of them.
I read somewhere else that you could change the gateway that the server puts out in DHCP but this would affect all computers....or is there a way to change the DHCP settings for one set of computers? I didn't think so but then again I'm not qualified in servers, just teaching myself as I go along and certain things are needed.
I also read somewhere that I could use GP to put a random proxy into IE but Firefox may be on some of the PCs or Chrome so if I change the policy for IE would any other browser automatically pick up on that?
Any ideas or pointers would be appreciated.