一个不用windows api实现的 UPNP NAT 工具类。用于在内网机器上远程配置网关上的NAT，需要网关支持uPnP协议（如xp操作系统就支持）-a no windows api achieved UPnP NAT tools category. Including net for the machines remotely configure the NAT Gateway, the Gateway needs support Accessing agreements (for exa