how to block VPN access in java

I am doing my final year project and in my college we have access points every where and they have a firewall to block the social networking and other websites but my collegemates used to bypass the firewall through free VPN and anonymous tools.
So, i thought of doing a project to block the VPN access and other anonymous tools that allows the users to bypass the firewall. So. how to develop a software to block these VPNs without changing the router configuration.
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