MicroNet Technology SP3367A - Manual (Page 40)

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Virtual Server
Go to Advanced Setup
Æ NAT Æ Virtual Server to set virtual server as
needed (known as Port Mapping).
Virtual server opens the port(s) for specified service and maps the port(s)
to the private IP address of the server. It allows remote users accessing
services such as the Web or FTP at the local site via public IP address. In
other words, it redirects the request from Internet to the local server which
is configured with private IP address.
Some applications will require a set or a range of ports (example
4000~5000) to a specified local machine to route the packets. The router
allows user to configure the needed port mappings to suit such
applications.