MitraStar Movistar GPT-2541GNAC, User Manual

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Chapter 6 Network Address Translation (NAT) 64
You may enter a single port number or a range of port numbers to be forwarded, and the local IP
address of the desired server. The port number identifies a service; for example, web service is on
port 80 and FTP on port 21. In some cases, such as for unknown services or where one server can
support more than one service (for example both FTP and web service), it might be better to specify
a range of port numbers. You can allocate a server IP address that corresponds to a port or a range
of ports.
Figure 35 Virtual Servers Add