Abstract: The popularization for P2P technique has optimized the Internet experience; however, it brings big pressure to the Internet Service Provider (ISP) for it overly consumes the network bandwidth. This paper proposed a mechanism for optimizing P2P traffic based on the network measurement between networks related to different services, which set up the base layer network model and can optimize the connection between peers through comprehensively considering the base layer network information and particularity of services. Performance analysis and simulation show that this mechanism can not only reduce the traffic between networks but also optimize user experience.

Key words: P2P, DDP, Peer Selection

摘要： P2P技术的普及优化了用户的体验，但对带宽的过度消耗也带给网络运营商巨大的压力。据此提出基于网络测量的、业务相关P2P跨域流量优化机制，该机制对底层网络建立模型，通过综合考量底层的网络信息和具体P2P业务的特殊性来优化节点互联。实验结果表明，该处理机制明显减少了跨域流量，优化了P2P用户的体验。

关键词: P2P, DDP, 节点选择