P2P应用对网络的影响和识别方法研究

【作者】 者明伟；

【导师】 贺思德；

【作者基本信息】 云南大学 ， 通信与信息系统， 2010， 硕士

【摘要】 P2P技术在出现后的短短几年间得到了迅速发展,P2P应用已经成为当今互联网的主流,根据目前的统计数据显示,P2P流量已经占据了互联网总流量的60%—70%。P2P应用的迅猛发展对网络带来了巨大的负面影响,占用了过多的网络带宽,恶化了网络的安全环境。为了管理P2P应用,首先需要识别P2P流量,因此,准确地识别P2P流量对于保证网络的服务质量、流量监控、网络安全有着重大意义。本文对目前存在的P2P流量识别方法进行了分类归纳,从正确性、精确性、算法的复杂程度三方面对它们的识别性能进行了对比,发现基于端口的流量识别方法能够识别的P2P应用数量有限,且准确率在不断下降;基于P2P流量特征的识别方法现在还不能对P2P流量进行分类识别,还需要进一步完善;基于特征码的识别方法,不但能够实现对P2P流量的准确识别和应用分类,而且实现技术简单,广泛地应用于各种流量检测系统。对于基于特征码的P2P流量识别技术,对P2P的分析是其前提和基础。本文分别分析了P2P的定义、网络拓扑结构、节点资源搜索方式以及主要应用,总结了P2P流量的特点和对网络的影响。通过对迅雷、BitTorrent、PPlive这三种应用最广泛的P2P应用软件的工作过程进行分析,归纳出它们的特征码,并以此总结出一些获取特征码的方法。本文最后利用基于特征码的P2P流控软件Panabit,对一个发生网络拥塞的校园网进行部署,发现P2P应用是造成网络拥塞的主要原因。通过制定相应的优化策略,取得了满意的效果,同时也为相关的案例提供了一定的借鉴作用。更多还原

【Abstract】 After the emergence of P2P technology in the short few years has been rapid development,P2P applicatins have become the mainstream of today’s internet,based on current statics,P2P traffic have occupied 60%-70% of the total traffic.The rapid growth of P2P application on the network has brought enormous negative impact,take up too much network bandwidth,deteriorated network’security.In order to manage P2P applicatons,first of all need to identify P2P traffic,therefore,accurate identification of P2P traffic to guarantee network service quality,traffic monitoring,network security is of great significance.The existing P2P traffic identification methods are classified in this paper, From the correctness, accuracy, algorithm complexity, compared to their recognition performance. Found that the flow of port-based identification method can identify a limited number of P2P applications, And the steady decline in accuracy; Feature-based P2P traffic identification method is not yet on the P2P traffic classification, Require further improvement; Signature-based identification method, not only to achieve an accurate identification of P2P traffic and application classification, but also implementation technology is simple, widely used in a variety of flow measurement and control systemFor signature-based P2P traffic identification technology, P2P protocol must be analyzed. This paper analyzes the P2P technology works, network topology and node resource search. Summarizes the characteristics of P2P traffic. Through BitTorrent, Thunder, PPlive the three most widely used P2P applications work process analysis, Sum up their signature, and sums up some method of obtaining signatures.Finally, use flow control software Panabit, to deploy a network congestion occurs in the Campus Network, found that network congestion caused by P2P applications is the main reason. Through the development of appropriate optimization strategies, and achieved satisfactory results, As well as give relevant case provides some reference.更多还原