How to access external network computer in the router
Due to the conditions, not to the server specifically assigned a dedicated external network IP, server directly through the network cable in the router above, in the cmd ipconfig query to the IP only network of IP (192.168. . ), But we know that no matter to in any way connected to the network device on the Internet has a unique address ID to identify themselves, even if the connection to the Internet through a router network equipment is no exception, but how network devices in the network to identify itself in the uniqueness of the Internet it?
First, log into the router we can see that the router has its own external network IP, network routing devices under their network will assign network IP (192.168. . ), So the net inside the device, including network and is the only range and so far, we can see that the router outside the network has a unique IP, network devices connected to the router, including network have a unique internal network IP , so the network equipment in the network outside the network can identify themselves in only. The method is the router's port mapping .
We want to access outside the network within the network computer, simply want access to a port in a computer network, such as: want within remote desktop control network computers, in fact, wanted to port 3389 to access the internal computer, the remote desktop control is map port 3389.
principle:
Router IP (outside the network IP): external ports: network computer IP (192.168. . ): Network port
Through the above four parameters above (external network IP, external network port, the network IP, network port) can be a network port (for example: remote desktop network port 3389) that uniquely identifies the network computer.
How in the router within the port mapping, log into the router into the "Forwarding Rules" -> "virtual server", because the router IP (Example: 135.165.13.145) has been determined, simply configure the external network port, internal network IP, network port three parameters. For example: Configuring the external network port (used to access the Internet) 2208, the internal network IP (the computer that you want to access the intranet IP) is 192.168.1.102, the network port 3389 (the real network port for communication) to save the configuration. Rear.
You can extranet remote desktop computer within a computer network control, win + R Enter "mstsc" open remote desktop control program 
extranet access 135.165.13.145:2208 fact, and between the internal network computer access 192.168.1.102:3389 It is the same, this port mapping to achieve.
