As jggimi and others have said, you're trying to solve a policy problem with technical means.
This is not a technical issue, inform the students/faculty that 'rapidshare' is not permitted on your network.. instead of silently blocking traffic you don't approve of (..inherently impossible), tell them the rules.
You're opening a door to the world, turning it into window will not stop people from trying to go outside.
Hope that helps.
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