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虚拟专用网技术I虚拟专用网技术摘要虚拟专用网（vpn）被定义为通过一个公用网络（通常是因特网）建立一个临时的、安全的连接，是一条穿过混乱的公用网络的安全、稳定的隧道。使用这条隧道可以对数据进行几倍加密达到安全使用互联网的目的。虚拟专用网是对企业内部网的扩展。虚拟专用网可以帮助远程用户、公司分支机构、商业伙伴及供应商同公司的内部网建立可信的安全连接，并保证数据的安全传输。虚拟专用网可用于不断增长的移动用户的全球因特网接入，以实现安全连接；可用于实现企业网站之间安全通信的虚拟专用线路，用于经济有效地连接到商业伙伴和用户的安全外联网虚拟专用网。本文主要介绍vpn的应用、基本原理和具体实现关键词隧道/安全连接/虚拟专用线路虚拟专用网技术IIVIRTUALPRIVATENETWORKTECNNOLOGYABSTRACTVirtualprivatenetwork(VPN)isdefinedasthroughapublicnetwork(usuallyInternet)toestablishatemporary,safetyofconnections,isapaththroughthechaossafeandstablepublicnetworkoftunnels.UsethistunnelofdatacanbeseveraltimestothesafeuseoftheInternetencryptedpurpose.VirtualprivatenetworkistheexpansionofIntranet.Virtualprivatenetworkcanhelpremoteusers,thecompanybranch,businesspartnersandsupplierswithcompanyIntranetestablishreliablesafetyconnection,andensurethesafetyofdatatransmission.VirtualprivatenetworkcanbeusedforgrowingmobileusersglobalInternetaccess,inordertoachievesafetyconnection;Canbeusedtoachieveenterprisewebsitesecurecommunicationsbetweenvirtualprivateline,usedforeconomiceffectivelyconnectedtocommercialpartnersandthesafetyofusersoutsidenetworkingvirtualprivatenetwork.ThispapermainlyintroducestheVPN'sapplication,thebasicprincipleandrealizationKeywordstunnel，safetyconnection，virtualprivatelines虚拟专用网技术III目录1所谓的VPN....................................................................................11.1简介..........................................................................................11.2功能..........................................................................................12Vpn的应用....................................................................................12.1AccessVPN...............................................................................22.1.1AccessVPN简介................................................................22.1.2AccessVPN的用途.............................................................22.1.3AccessVPN的优点..............................................................32.2IntranetVPN...........................................................................32.2.1IntranetVPN简介.............................................................32.2.2IntranetVPN的优点..........................................................42.3ExtranetVPN...........................................................................43Vpn的基本原理.............................................................................43.1vpn的实现技术........................................................................43.1.1隧道技术............................................................................43.1.2隧道协议............................................................................53.2Vpn的安全性..........................................................................53.2.1防火墙...............................................................................53.2.2加密技术............................................................................63.2.3IPSec.................................................................................6虚拟专用网技术IV3.2.4AAA服务器.........................................................................73.3QoS技术....................................................................................74Vpn的具体实现.............................................................................94.1Ipsecvpn.................................................................................94.1.1为什么要导入IPSEC协议...................................................104.1.2包封装协议.......................................................................104.1.3安全协议（加密）.............................................................114.1.4安全协议（数据认证）......................................................114.1.5安全协议（身份认证）.......................................................124.1.6其他.................................................................................124.1.7IPSEC通过包封装包的方法................................................124.2sslvpn..................................................................................164.2.1Ssl简介..........................................................................164.2.2Sslvpn的定义.................................................................164.2.3Sslvpn的特征.................................................................174.2.4sslvpn的优点.................................................................194.3分类比较.................................................................................194.3.1部署、管理成本................................................................194.3.2安全性.............................................................................214.3.3可扩展性...........................................................................224.3.4访问控制方面...................................................................234.3.5经济性..............................................................................23虚拟专用网技术V4.3.6各实现在哪一层的优劣......................................................244.4IPSECVPN配置：................................................................24