Providing the network of a school class with internet access

The Microsoft ISA-Server can be uses as a proxy server to provide internet access to a school class. Additionally it gives the possibility to define a firewall to restrict access to some ports. Also it provides a traffic analyser. I installed the ISA-Server on a on Microsoft Windows 2003.
Since my schoolmates had also the task to set up different servers and test them they wanted the opportunity to work from home on their tasks. The conclusion was to install a VPN. For this the ISA-Server was ideal. After a couple of configurations it was possible for my class mates to create a VPN tunnel from home to our class network and work on their projects.