Billion Electric Company BiGuard 50G - Manual (Page 138)

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Candidates: You can also select the Candidates which are referred from the ARP
table for automatic input.
Select the Apply button to apply your changes.
4.4.8.2 Port Forwarding Table
Because NAT can act as a "natural" Internet firewall, your router protects your
network from being accessed by outside users, as all incoming connection attempts
will point to your router unless you specifically create Virtual Server entries to
forward those ports to a PC on your network.
When your router needs to allow outside users to access internal servers, e.g. a web
server, FTP server, Email server or game server, the router can act as a "virtual
server". You can set up a local server with a specific port number for the service to
use, e.g. web/HTTP (port 80), FTP (port 21), Telnet (port 23), SMTP (port 25), or
POP3 (port 110). When an incoming access request is received, it will be forwarded
to the corresponding internal server.
Click Create to add a new port forwarding rule.
This function allows any incoming data addressed to a range of service port
numbers (from the Internet/WAN Port) to be re-directed to a particular LAN
private/internal IP address. This option gives you the ability to handle applications
that use more than one port such as games and audio/video conferencing.