I'm an administrator at a local college and they needed some easy way to shut down internet traffic during class houres.
I couldn't run a webserver on the firewall, so I had a cronjob run a perlscript to fetch computer IPs from the actual webserver and change IPChains rules accordingly.
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Why in the world would they want to do that? Are they such
a low-quality institution that their students wouldn't go to class if
they could surf the Web instead?