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Anonymous
universities tend to employ the following: port/ip whitelisting, limit of number of ports in usage at a time, and not forwarding packets to you that didn't come from a place that you contacted first. On top of this most also make you log into the firewall for clearance every so often or you are cut off of the network completely. on top of this i have known places to forward announce packets to nowhere making it so that you can't begin really. They usually can do similar things with Kazaa, Gnutella, and Napster by rerouting the ips interally as well.
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