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When NAT is enabled on the ROUTER, the whole LAN that the ROUTER is attached
will appear as a single machine on the Internet. Normally, external users are not allowed
to visit the PCs in the whole LAN to which the ROUTER is attached. But under some
circumstances, we hope that some PCs will be open and allow anyone to access them. At
this time, we can use the virtual server to perform this. After the virtual server is
configured, when the packets that the ROUTER receives request to enter the local server,
the ROUTER will identify the service categories according to the "port" number
encapsulated within the packets. For example, "port 21" stands fro FTP service. Now, we
will explain it with an example. The topology is as follows:
The WAN IP Address of the ROUTER is 203.70.212.52. The PC1 192.168.1.10 attached
to it is a WEB Server; PC2 192.168.1.20 is a FTP server. These two servers are intended
to be open to external users. The detailed configuration steps are as follows:
Click "Add" to show the following interface.
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