BT网络流量监控与带宽管理的研究

BT网络流量监控与带宽管理的研究摘要近年来，P2P网络逐渐成为新一代互联网技术研究的热门话题，现在深受人们喜爱的BT软件就是P2P网络的典型代表。BT(BitTorrent)是P2P在资源共享方面的应用，可以说它是一个最新概念的P2P下载工具，它采用了多点对多点的原理：每个人在下载的同时，也在为其他用户提供上传。BT下载方式出现之后，很快就被下载迷们用来交流最新的电影大片或软件，如今已经得到广泛的推广。BT的出现给资源的共享带来了很多的便利，但同时由于BT消耗带宽非常严重，使用BT下载容易造成网络流量的堵塞，从而影响了大多数正常网络用户的网速。因此如果能对BT的网络效率进行改善，使之能够减小带宽消耗，将是P2P技术上一个很大的进步。这样既可以让广大BT爱好者尽情地下载，又不会影响其他用户的正常上网。本文第一章论述了P2P的背景、技术现状、特点及发展过程，第二章详细介绍了BT协议、工作原理和下载流程。第三章以BT为例介绍了P2P网络流量现状，并介绍P2P流量测量、识别的相关技术，为下文的P2P流量控制和带宽管理提供了前提。第四章研究介绍了当前P2P流量控制和带宽管理的最新技术及相关产品，提出了一种新的P2P流量控制和带宽管理的改进方案：利用MCU（多点控制器）来对局域网内的多点群组通信进行控制。关键词P2P流量识别流量控制带宽管理SIMULATIONOFBANDWIDTHMANAGEMENTINP2PNETWORKABSTRCTRecently,asarepresentativeoffilesharingsoftware,BT,isgraduallybecomingprevailingontheinternet.Itbringsusunprcedenteddownloadingspeed,sothatwecandownloadourdesiredresourceswithoutanyeffort,andshareourownresourceswithothers.Thishighspeeddownloadingisatwo-edgedsword,ontheonehand,itcanbringusitsconvenience,ontheotherhand,italsooccupiestoomuchbandwidth.IthasbeenabottleneckofthedevelopmentofBTthatitsdownloadingconsumestoomuchbandwidth,whichneedstobeaddressedimmediately.OPNETisarelativelyexcellentnetworksimulationsoftwareuntilnow.Itisverystrongandoffersgreatconveniencesduringournetworksimulation,andmoreoptionswithitsflexibilities.Wecanstudydifferentaspectsofnetwork,sowecanchoosekeypointanddiscardthelessimportantpoints,whichnotonlycaneasetheworkload,boostefficiencyandkeeptheaccuracyandauthenticityuntouched.ThispaperusesOPNETtosimulatethebandwidthcharacteristicofMAN,inthepurposeofdiscussingthechangesofinteriorcommonpoints’downloadingbandwidthbroughtaboutbyputtinglimitsonegressbandwidthofrouterinMAN,basedonwhich,wecanfurtherputforwardsomestrategiesofbandwidthmanagement,sothatthebandwidthconsumingcanbealleviated.Thispaperisdividedintoseveralparts.Thefirstpartincludeschapter2and3,anintroductiontothebasicelementsofBTdownloading.Thesecondpartisthechapter4,anintroductiontoOPNET.Thethirdpartischapter5,specificlyintruoduceexperiment’sprecodureandresults,andthelastissomeprospectinthisfield.KEYWORDSp2pnetworkBTdownloadsimulationsoftwareWANbandwidthmanagement目录1．P2P概述.................................................................................................................11.1网络应用的现状...............................................................................................11.2P2P的介绍.......................................................................................................11.3P2P的界定.......................................................................................................21.4P2P网络与现有互联网技术比较....................................................................21.5P2P应用前景....................................................................................................31.6P2P发展状况....................................................................................................41.7P2P模式与C/S模式的比较............................................................................51.8P2P行业现状与展望........................................................................................72．BT原理.....................................................................................................................92.1BT简介..............................................................................................................92.2BT中的概念解释..............................................................................................92.3BT工作原理......................................................................................................102.4BT系统架构......................................................................................................112.5BT协议简介......................................................................................................123．网络流量测量与识别...............................................................................................143.1P2P业务对于互联网的影响............................................................................143.2当前P2P网络所面临的主要问题...................................................................151BT系统带宽问题...............................................................................................152BT系统性能问题...............................................................................................153BT网络安全问题..............................................................................................154BT网络流量控制..............................................................................................163.3网络流量测量方法............................................................................................161主动测量技术.....................................................................................................162被动测量技术.....................................................................................................163网络流量抽样测量技术.....................................................................................173.4BT网络流量特点.............................................................................................171网络节点端口流量..................