特定P2P网络的主动测量研究*

为了实现信息可控的安全网络环境，需要对特定的P2P 应用系统进行测量与分析。测量的出发点在于寻找协议的主导节点或服务节点，在一定意义上是该应用协议可能存在的瓶颈。选取BitTorrent、Skype和Tor分别作为这三类不同的P2P应用系统的代表，分析其协议特性，并对它们的覆盖网络进行主动测量，最终得到互联网上协议主导节点的总量及分布情况，以便于进一步的监管分析。

Research in active measurement of special P2P networks

In order to create secure network environment with the controllable information,it becomes more important to mea-sure and analyzes special P2P application systems.A threshold of active measurement is to look for these guiding peers or ser-vice peers which may be bottlenecks of specific P2P protocols in a sense.This paper chose BitTorrent,Skype and Tor as representatives of the three different types of P2P networks,analyzed their characteristics,and introduced corresponding active measurement of their overlay networks,which could get the amount and distribution of the specific protocol peers on the Internet.It was also very useful to manage and analyze the P2P based on measured information.