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N150 Wireless ADSL2+ Modem Router DGN1000Bv3
Default DMZ Server
The default DMZ server feature is helpful when you are using some online games and
videoconferencing applications that are incompatible with Network Address Translation
(NAT). The modem router is programmed to recognize some of these applications and to
work correctly with them, but other applications might not function well. In some cases, one
local computer can run the application correctly if the IP address for that computer is entered
as the default DMZ server.
WARNING:
DMZ servers pose a security risk. A computer designated as the
default DMZ server loses much of the protection of the firewall
and is exposed to exploits from the Internet. If compromised, the
DMZ server computer can be used to attack other computers on
your network.
The modem router discards incoming traffic from the Internet that is not a response to one of
your local computers or a service that you have set up on the Port Forwarding / Port
T
riggering screen. Instead of discarding this traf
fic, you can have the modem router forward
the traffic to one computer on your network. This computer is called the default DMZ server.
To set up a default DMZ server:
1. Select ADVANCED > Setup > W
AN Setup.
The WAN Setup screen displays.
2. Select the Default DMZ Server check box.
3. T
ype the IP address.
4. Click the Apply
button.
Your settings are saved.
Change the MTU Size
The maximum transmission unit (MTU) is the largest data packet a network device transmits.
When one network device communicates across the Internet with another, the data packets
travel through many devices along the way. If a device in the data path has a lower MTU
setting than the other devices, the data packets are split or “fragmented” to accommodate the
device with the smallest MTU.
The best MTU setting for NETGEAR equipment is often just the default value. In some
situations, changing the value fixes one problem but causes another
. Leave the MTU
unchanged unless one of these situations occurs:
• You have problems connecting to your ISP or other Internet service, and the technical
support of either the ISP or NETGEAR recommends changing the MTU setting.