Studies on P2P network configuration and control methods based on traffic measurement

(1) P2P应用的流量特征：我们测量和评估了P2P应用的流量特征。测量结果表明，Internet上的文件流量比之前报道的结果大得多。(2) P2P流量的流量识别方法和控制方法：针对P2P文件共享应用Winny提出流量识别方法。评估结果表明，即使在加密通信中，我们的方法也是非常有效的。对于Winny的流量控制，我们关注于对等体之间的数据包序列，另一方面，对于WinMX，我们限制了对根服务器的连接，当每个对等体加入WinMX网络时，它总是被访问。通过使用这些点，我们让对等体不配置它们的覆盖网络。这些方法有效地控制了它们的流量。(3)覆盖网络的配置：我们测量了Winny的覆盖网络，为研究覆盖网络上的流传输方式收集基本信息。并结合测量和计算机模拟实验对Winny网络的大小进行了估计。(4)服务质量的定量研究：对TCP New Reno和TCP SACK流量进行了测量和评价。一般情况下，SACK方案在理想状态下具有较好的性能，但在通信实体的CPU负载较重的情况下，TCP SACK会导致较差的性能。我们还提出了RTT估计方法来评估TCP流量。

(1)Traffic characteristics for P2P tapplications :We measured and evaluated traffic characteristics for Peer to Peer(P2P) applications. The measurement results show that the file traffic volume in the Internet is much larger than that of the previous reported results.(2)Traffic identification method and control method for P2P traffic :We proposed traffic identification method for a P2P file sharing application Winny. The evaluation results show that our proposed method is much effective even for the encrypted communication. For Winny traffic control, we focus on packet sequences between peers, on the other hand for WinMX, we restrict connection to the root server, which is always accessed by every peer when it joins the WinMX network. By using those points, we let peers not configure their overlay network. These proposed methods control their traffic effectively.(3)Configuration of overlay network :We measured Winny's overlay network to collect basic information for studying streaming delivery method over overlay network. We also estimate size of Winny network with combination of measurement and computer simulation experiments.(4)Quantitative study on quality of service :We measured and evaluated TCP New Reno and TCP SACK traffic. In general, SACK scheme gives better performance in ideal condition, but we show that TCP SACK results worse performance in the case that the communication entities are heavily CPU load condition. We also proposed RTT estimation method to evaluate the TCP traffic.