可以实现端口映射功能，本软件可实现端口映射功能，一个主要用途就是可以在局域网的网关上运行本程序，将网关服务器的某个端口（如8081）映射为局域网中某台机器的某个端口（如80），这样，局域网外部访问网关服务器的8081端口就相当于访问了局域网内部某台机器的80端口了。-Can realize the port mapping function, this software can realize the port mapping function, one of the main purposes is to be able to run on local area network gateway of this procedure will be a gateway server port (eg 8081) mapped to a LAN to a machine port (eg 80), so that external access LAN gateway server port on the 8081 equivalent of a visit to the internal LAN machine the port 80.