Owner's Manual

Advanced Configuration
62
N300 Wireless Gigabit ADSL2+ Modem Router DGN3500
Setting Up a Default DMZ Server
The default demilitarized zone (DMZ) server feature is helpful when you use some online
games and video confrencing applications that are incompatible with NAT. The wireless
modem router is programmed to recognize some of these applications and to work correctly
with them, but there are other applications that might not function well. In some cases, one
local computer can run the application correctly if that computer’s IP address is entered as
the default DMZ server.
Note: For security reasons, you should avoid using the default DMZ server
feature. When a computer is designated as the default DMZ server,
it loses much of the protection of the firewall, and is exposed to
many exploits from the Internet. If compromised, the computer can
be used to attack your network.
Incoming traffic from the Internet is usually discarded by the wireless modem router unless
the traffic is a response to one of your local computers or a service that you have configured
in the Ports screen. Instead of discarding this traffic, you can have it forwarded to one
computer on your network. This computer is called the default DMZ server.
To assign a computer or server to be a default DMZ server:
1 Log in to the wireless modem router at its default LAN address of http://192.168.0.1 with
its default user name of admin and default password of password, or using whatever
user name, password, and LAN address you have chosen for the wireless modem
router.
2 In the main menu, under Advanced, click WAN Setup to display the following screen.
3 On the WAN Setup screen, select the Default DMZ Server check box.
4 Type the IP address for that server.
5 Click Apply to save your changes.
The LAN Setup screen allows configuration of LAN IP services such as Dynamic Host
Configuration Protocol (DHCP) and Routing Information Protocol (RIP).
The wireless modem router is shipped preconfigured to use private IP addresses on the LAN
side and to act as a DHCP server. The wireless modem router’s default LAN IP configuration
is:
• LAN IP address: 192.168.0.1
• Subnet mask: 255.255.255.0
These addresses are part of the designated private address range for use in private networks
and should be suitable for most applications. If your network has a requirement to use a
different IP addressing scheme, you can make those changes in the LAN Setup screen.