Netgear DGND3700B User Manual download pdf (Page 50)

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N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2

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 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.

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.

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 Port Forwarding/Port Triggering 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 set up a default DMZ server:

1. On the WAN Setup screen, select the Default DMZ Server check box.

2. Type the IP address.

3. Click Apply.

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 any device in the data path has a lower MTU

setting than the other devices, the data packets have to be split or “fragmented” to

accommodate the device with the smallest MTU.

The best MTU setting for NETGEAR equipment is often just the default value, and changing

the value might fix one problem but cause another. Leave 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. These

web-based applications might require an MTU change:

- A secure website that will not open, or displays only part of a web page

- Yahoo email

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Netgear DGND3700B User Manual Page 50