Abstract: The performance of PeertoPeer (P2P) content multicast systems usually degrades dramatically because of peer’s selfish behaviors such as freeriding. To solve this problem, the paper suggests that each peer monitors its neighbors’ bandwidth and manages connections with them according to the results of monitoring, so as to distribute efficiently the massive content to all peers in selfish environments. The proposed protocol is explained in details and performance analyzing and simulating show that the protocol incurs a moderate and constant network load on peers and distribution server in the system.

Key words: P2P, content multicasting, incentive mechanism