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It's possible - definitely not guaranted - you could expire your cached address if you use another Ethernet MAC on the your cable. Bring in another laptop or stick a PCMCIA Enet card in and use it for awhile. If the alternate adapter works you at least know the problem is limited to your address.
Again, no guarantee. It depends on the router/switch policies & implementation.
And as bendsley said, it could be a bigger problem. Even if you manage to flop your address they could be blocking your university, or the university could be blocking them, which would mean time to get happy with proxies.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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