2、N新业务，为商用客户既提供了高带宽低资费的企业网络联网服务，又提供了在公用网络上拥有私有VPN网络的数据传输安全保障服务，赢得了广大商用客户的青睐。本文将研究IPSec体系结构、技术原理和VPN基本技术，分析了IPSec VPN的主要实现方式。关键词：IPSec vpn ，加密， 隧道， 安全。AbstractCurrently, TCP / IP network traffic is almost all of the foundation, and IP itself does not provide "security", in the transmission
3、process, IP packets can be forged, altered, or prying eyes. To solve these problems, IPSec can effectively protect the security of IP datagrams, which provides a standard, robust and inclusive mechanisms, can use it for the IP and upper layer protocol (such as UDP and TCP) to provide secur
4、ity guarantees. Many telecom operators using IPSec tunnel encryption technology, on the basis of the introduction of broadband services for business customers VPN major new business, both for commercial customers to provide a high-bandwidth network with low rates of enterprise network serv
5、ices, also provided in the public network has a private VPN network data security services, won the majority of commercial customers. This paper will study the architecture of IPSec, VPN technology principles and basic technology, analyzes the main way to achieve IPSec VPNKeyword：IPSec vpn
