Billion Electric Company BiGuard 50G - Manual (Page 139)

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Application: User defined application name for the current rule.
Helper: You could also select the application type you would like to apply for
automatic input.
Protocol type: please select protocol type
External Port: Enter the port number of the service that will be sent to the Internal
IP address.
Redirect Port: Enter a new port number for the service that will be sent to the
Internal IP address.
External IP Address: Please click candidate to select the WAN interface or the
WAN IP address.
Internal IP Address: Enter the LAN server/host IP address that the service
request from the Internet will be sent to.
Candidates: You can also select the Candidates which are referred from the
ARP table for automatic input.
NOTE: You need to give your LAN server/host a static IP address for the Virtual
Server to work properly.
Click Apply to save your changes.
Using port forwarding does have security implications, as outside users will be able
to connect to PCs on your network. For this reason, using specific Virtual Server
entries just for the ports your application requires, instead of using DMZ is
recommended.