I am a network admin for a secondary school. Some of our students are accessing the Internet without permission. Our current set up has the workstations connected to a DHCP that is connected to an ISA server, which is administered by a third party company. How can we monitor the Internet usage and only permit usage when it's required? Should we install a switch, a firewall, turn off DHCP and allocate our own fixed addresses?
You can cut off Internet access with a switch, firewall, proxy server, router, or a pair of electrically-shielded scissors. The real question is, how can you turn it on and off easily from within the classroom? Most firewalls, proxy servers, and many routers, provide a browser interface that you could use to turn routing on-and-off. Even my $100 Linksys home router has this. If you want to be able to turn it on-and-off with the press of a single button, you may need to find a programmer with networking skills, or an administrator with scripting skills.
This was first published in November 2003