Billion BiPAC 5210G RC User Manual page 52

DMZ
The DMZ Host is a local computer exposed to the Internet. When setting a particular internal IP
address as the DMZ Host, all incoming packets that do not use a port number which is already used
by any other Virtual Server entries will first be checked by the Firewall and NAT algorithms before it
is passed to the DMZ host.
DMZ setting for: indicate the related LAN PC and PVC ports which allow outside network to connect
in and communicate.
DMZ:
Disabled: As set in default setting, it disables the DMZ function.
Enabled: It activates your DMZ function.
DMZ Host IP Address: Give a static IP address to the DMZ Host when Enabled radio button is
checked. Be aware that this IP will be exposed to the WAN/Internet.
Select the SAVE button to apply your changes.
Virtual Server
In TCP/IP and UDP networks, a port is a 16-bit number used to identify which application program
(usually a server) incoming connections should be delivered to. Some ports have numbers that
are pre-assigned to them by the IANA (the Internet Assigned Numbers Authority), and these are
referred to as "well-known ports". Servers follow the well-known port assignments so clients can
locate them.
If you wish to run a server on your network that can be accessed from WAN (i.e. from other machines
on the Internet that are outside your local network), or any application that can accept incoming
connections (e.g. Peer-to-peer/P2P software such as instant messaging applications and P2P file-
sharing applications) and are using NAT (Network Address Translation), then you will usually need
to configure your router to forward these incoming connection attempts to the PC on your network
using specific ports. You will also need to use port forwarding if you want to host an online game
server.
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