Billion Electric Company BiGuard 2 - Manual (Page 107)

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Enable DMZ function:
Enable: Activates your router’s DMZ function.
Disable: Default setting. Disables the DMZ function.
DMZ IP Address: Give a static IP address to the DMZ Host when the Enable radio
button is selected. Be aware this IP will be exposed to the WAN/Internet.
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.
4.4.7.2 Port Forwarding
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.