低成本远传网络组建方案——VPN原理分析和组建实例及配置方法

Low cost long-distance data transfer network project——the analysis of principle of VPN and building cases and configuration methods

随着企业的发展和计算机网络系统使用的日益普及 ,企业与分支机构间需要交换的信息数据越来越多 ,一大批企业需要组建自己的数据远传网络系统 .怎样合理地组建数据远传网络 ,是一个急需解决的问题 .当前一般有三种方案 .一是电信专线 ,二是长途拨号 ,三是通过互联网来传输 .利用电信专线传输 ,虽然安全 ,但成本太高 ;长途拨号 ,数据信息传输量和速度又受到极大的限制 ;利用互联网传输 ,数据安全隐患很难排除 .本文讲述一种利用日益成熟的虚拟专用网络 ( Virtual Private Network,简称 VPN)技术 ,组建异地数据远传网络 ,它可以满足降低成本和保障数据安全两方面的要求 .可谓是“鱼与熊掌兼得”

With the enterprise′s development and wide use of network technology, there is more and more data exchange between enterprises and its branches, and a large numbers of enterprises need to build up its long-distance data transfer network system. How to establish its long-distance data transfer network reasonably and perfectly is an urgent problem. Currently for enterprises there are three choices to build up the system. First one is to establish long-distance data transfer network system by leased line which can secure the data transfer but the cost is quiet high. The second is by long-distance dial-up system, which would limit the data stream and transfer speed very much. The third is to transfer data by Internet, which is hard to meet the security requirement. This paper focuses on an increasing mature Virtual Private Network (VPN) technology which not only low the cost of building up long-distance data transfer network system but also meet the security requirement. The paper introduces the theory of VPN clearly as well as illustrates specific example to the readers.