Abstract: A system for simulating the P2P(peer-to-peer) network was designed and implemented, based on deep analysis on its protocols. Large scale simulation experiments were performed so as to identify the topology of the logical P2P network. The results of all experiments demonstrate that the logical P2P network is a network with small average path length, big cluster coefficient, and its degree follows the exponential distribution. It is easily derived from these features in applying the complex network theory that the P2P logical network is a small-world one with the exponential degree distribution.

Key words: P2P logical network,Topology,Simulation