VPN(Virtual Private Network) is a current security technique to set up a safe network, and becomes a researching focus for its security, agility and economic.

• 虚拟专用网(VPN，Virtual Private Network)就是一种常见的建设安全的企业内部网的安全技术，并以其安全性、灵活性和经济性成为了研究的热点。