N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000
•NAT Filtering. Network Address Translation (NAT) determines how the wireless modem router processes inbound traffic. Secured NAT provides a secured firewall to protect the computers on the LAN from attacks from the Internet, but might prevent some Internet games,
-Disable SIP ALG. Some VoIP applications do not work well with the SIP ALG. Enabling this option to turn off the SIP ALG might help your VoIP devices to create or accept a call through the router.
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 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 forward it 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.
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