Despite rumors, Princeton has not banned the iPad from campus. It has however, found a bug (and workaround) with Apple’s latest device.
Describing what they feel is a bug with the iPad’s operating system, Princeton recently announced (via their Knowledge Base):
Network monitoring has shown that many iPad devices have caused a problem on the campus network. These devices continue to use an IP address they have been leased well beyond the time they should. (In technical terms, the device’s DHCP client software stops renewing its lease, but the device keeps using the IP address after the DHCP lease expires. This is not a WiFi issue.) This behavior causes a disruption on the campus network.