| 1. | At first , the definition , taxonomy , mplement , management and the key technolodgy are introduced . the tunelling techenolodgy , ip security protocol is the emphasis of research , including the functions , the modes , domain of interpretation , the series protocols of ipsec . the other clue is the research of multicast
首先介绍了vpn的定义、分类、实施和管理，对vpn的关键技术进行了分析和讨论；论述了安全隧道技术，重点放在vpn协议的ip层安全协议( ipsec ， ipsecurity )的结构体系，包括ipsec的功能、实施、模式、解释域等。 |
