一、虚拟专用网概况随着网络的开放性、共享性及互联程度的扩大,使得网络的重要性和对社会的影响也越来越大。与此同时,一些网络新业务的不断兴起,如电子商务、数字货币和网络购物等,对网络的安全性提出了更高的要求,通常采用包过滤防火墙、应用网关和代理技术等来保证网络通信 First, the virtual private network Overview With the openness of the network, sharing and expansion of the degree of interconnection, making the importance of the network and the impact on society is also growing. In the meantime, some new services in the internet are emerging, such as e-commerce, digital currency and online shopping, which place higher demands on network security. Packet filtering firewalls, application gateways and proxy technologies are usually adopted to ensure network Communication