【摘要】 <正> 1 引言 VPN(Virtual Private Network)具体实现是采用隧道技术,将企业网的数据封装在隧道中进行传输。因此.VPN技术的复杂性首先建立在隧道协议复杂性的基础之上。隧道协议中最为典型的有CRE、IPSec、L2TP、PPTP、L2F等。其中GRE、IPSEC属于第三层隧道协议,L2TP、PPTP、L2F属于第二层隧道协议。第二层隧道和第三层隧道的本质区别在于用户的IP数据包是被封装在何种数据包中在隧道中传输的。 VPN产品可以基于硬件和软件方式实现,如Cisco、3Com、Nortel等国际著名网络公司都有基于硬件实现的产品.基于软件的产品,如Sun公司的SunScreen Secure Net,它们的价格昂贵,并且将整个网络的安全托付给国外的公司不能令人放心。更多还原

【Abstract】 VPN can be implemnted based on hardware or software, but these products are very expensive produced by some famous foreign country. Sun workstations are the main platform in China. So,developing security software based on Solaris is profound. First,according to the stream mechanisms,the architecture and key technology of implementing SecureGuard are analyzed. Then,how to use SecureGuard to build applications is presented.更多还原