Telkom ADSL 5102G Instruction Manual page 38

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 will be checked by the Firewall and NAT
algorithms then passed to the DMZ host, when a packet received does not use a port
number used by any other Virtual Server entries.
DMZ: Disabled: As set in default setting, it disables the DMZ function.
Enabled: It activates your DMZ function.
DMZ Host 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 Apply 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 the 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 are using NAT (Network Address Translation), then you will
usually need to configure your router to forward these incoming connection attempts using
specific ports to the PC on your network running the application. You will also need to use
port forwarding if you want to host an online game server.
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