I'm sure between you and all your roommates someone has an extra older pc. Load it up with linux, put a second NIC in it, and use it as your router and firewall. $20 for an extra NIC.
Or go buy a 10 user license Cisco PIX 501. A little over $300.
In either case, you'll have 500 X more functionality and options at your fingertips and if you don't already have the know how, you'll get a good opportunity to learn something that can be used in the real world as a marketable skill.
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