D-Link DWR-923 User Manual page 48

Advanced NAT  Port Mapping
Port Mapping can be used to translate the common service port to a
custom port inside your local network such as web or FTP.
List of Port Mapping Services: Displays all the port mapping rules for
the DWR-923.
Service: The name of the service for which the port mapping rule has
been created.
IP Address: The IP address of the computer on the local network to
which the traffic will be forwarded.
Port Translation: The port number of the destination host for traffic
forwarding.
Click Add to add a port mapping rule, or select an item and click Edit to
modify or click Delete to delete the selected item.
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