hello out there!
hope someone's a genius and can help me with that issue. first, let me explain what i'm trying to do:
i have a couple of classrooms fitted with iMac's. all of them have access to the internet over ethernet connection. what i want to do is, find a simple and easy solution how you can cutoff the internet access for a specific classroom. only internet, ethernet should still work though. i was thinking about a solution using a router in every classroom, but i'm not quite sure how to accomplish a fast cutoff (without having to connect to the router, then manually clear several ports, then open them again for browsing)...