Well one thing I would do immediately is change the router's MAC address to something else.
The MAC address (which has nothing to do with macintosh computers, BTW) is a unique serial number that each and every network device has. Your school's IT guys can easily check a list of all the MACs that are attaching to their network, and can quickly see what are routers and what are not, or at the very least can see if the devices are made by companies that make routers.
Therefore, go to the "MAC Cloning" section of your router's firmware and change the MAC to something that doesn't say "I'm a Router!!!."
The first few octets specify the company, so I would change those to a company that doesn't make routers, or a company that makes *everything*. There's a good list of companies over at:
http://standards.ieee.org/regauth/oui/oui.txt. You can also do a MAC address lookup at:
http://www.coffer.com/mac_find/I'd probably pick an address from Intel, or Apple, or Toshiba.
Another thing to do, which violates the spirit of the rule if not the text, is to use a computer with two network cards that shares the network connection instead of a standalone router. It will act like a router, but it will just be a computer running software. Wink Wink.
You can use Windows' own Internet Connection Sharing or run software like Sygate. You could run a Linux Distro like Smoothwall that's totally free and easy to set up as a firewall/router, or just install Ubuntu and ask the ubuntu forum guys how to do it.
If you go this route, you need a computer, two network ports in that computer, and at least a hub or switch. What you do is plug one network port into the jack in the wall, and the other network port goes to the hub. Then you plug other computers into the hub.
A good IT guy could figure out what was going on, but they'd have to dig for it. Upon casual inspection of logs, it wouldn't be obvious that the connection was being shared.
Hope this helps,
Llama
