虚拟局域网的设计与实现

Design and Implementation of Virtual LAN

NAT和防火墙设备的存在阻碍了很多应用和协议在Internet上的部署和实施.在局域网环境下,由于没有NAT和防火墙的限制,同一个局域网内的各种应用程序可以畅通无阻的通信.本文设计实现的虚拟局域网利用TUN/TAP虚拟设备和TUNNEL技术,可以突破NAT和大多数防火墙的限制,使受限的应用可以正常的通信.

The devices of NAT or firewall made the deployment and implementation of many applications and protocols difficult. However, under the Ethernet environment, there are no any NAT or firewall devices, all applications can communicate freely. In this paper, the virtual LAN is designed and implemented by making use of TUN/TAP driver and TUNNEL to traverse NAT and firewall, make those restricted applications communicating normally.