The campus peer-to-peer networks, called CP2P networks, are proposed based on the existing Chord protocol. According to colleges IP address ranges and users interests, every college network constructs a CP2P network. The performance parameters we got are as follows: The average maximum lookup length of the first node in the CP2P network is O(log2 N– log2 k). And other nodes lookup lengths are O(log2 mi). Here N is the total number of nodes in the whole network; k is the total number of CP2P networks; mi is nodes number of each CP2P network. CP2P networks enable the transfer locally and reduce the traffic in the campus network backbone. Meanwhile, nodes join and leave only in the local CP2P network. Security problems such as DDOS can be traced back to the attackers source colleges.
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