毕业设计(论文)诚信声明书本人郑重声明:在毕业设计(论文)工作中严格遵守学校有关规定,恪守学术规范;我所提交的毕业设计(论文)是本人在指导教师的指导下独立研究、撰写的成果,设计(论文)中所引用他人的文字、研究成果,均已在设计(论文)中加以说明;在本人的毕业设计(论文)中未剽窃、抄袭他人的学术观点、思想和成果,未篡改实验数据。本设计(论文)和资料若有不实之处,本人愿承担一切相关责任。学生签名:年月日I摘要本文首先介绍了VPN的定义和研究意义,接着介绍了实现VPN的关键技术(包括隧道技术,加解密认证技术,密钥管理技术,访问控制技术)以及实现VPN的主要安全协议,PPTP/L2TP协议、IPSec协议,为VPN组网提供了理论指导。最后通过构建中小企业的虚拟专用网,全面介绍了在Windowsserver2003ISA2004环境下站点到站点和站点到客户端的VPN的配置,为企业的VPN构建提供参考和借鉴。关键词:隧道,L2TP,PPTP,IPSecIIAbstractThispaperfirstintroducesthedefinitionofVPNanditsstudyimplications.AndthenintroducesthekeytechnologiesforimplementingaVPNwhichincludestheTunneltechnologyanditsmainsecureprotocols,PPTP/L2TPprotocol,IPSECprotocol,SOCKSv5protocol,AllthesetechnologiesprovidethetheoreticalbasesforbuildingaVPNnetwork.Finally,byconstructinganenterprisevirtualprivatenetwork,IintroducedtheconfigurationofsitetositeandsitetoclientVPNundertheWindowsserver2003ISA2004environment,itprovidesthereferentialguidelinetotheVPNconstructioninenterprises.Keywords:Tunnel,L2TP,PPTP,IPSecIII目录1绪论......................................................................................................................................11.1VPN的定义.....................................................................................................................11.2VPN的工作原理.............................................................................................................11.3VPN的研究背景和意义.................................................................................................22VPN的应用领域和设计目标.............................................................................................42.1VPN的主要应用领域.....................................................................................................42.2VPN的设计目标.............................................................................................................53实现VPN的关键技术和主要协议....................................................................................73.1实现VPN的关键技术....................................................................................................73.2VPN的主要安全协议.....................................................................................................93.2.1PPTP/L2TP..............................................................................................................93.2.2IPSec协议.............................................................................................................104实例分析............................................................................................................................124.1需求分析........................................................................................................................124.2方案达到的目的............................................................................................................134.3VPN组建方案网络拓扑图................................................................................