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N600 Wireless Dual Band Gigabit VDSL2 Modem Router DGND3800B
•
MTU Size (in bytes). The normal MTU (maximum transmit unit) value for most Ethernet
networks is 1500 bytes, or 1492 bytes for PPPoE connections. For some ISPs, you might
need to reduce the MTU. This is rarely required. You should change the setting in this
field only if you are sure that it is necessary for your ISP connection. See
MTU Size
on page 48.
•
NAT Filtering. Network Address Translation (NAT) determines how the 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, point-to-point applications, or multimedia applications from functioning. Open
NAT provides a much less secured firewall, but allows almost all Internet applications to
function.
•
Disable SIP ALG. The Session Initiation Protocol (SIP) Application Level Gateway (ALG)
is enabled by default to optimize VoIP phone calls that use the SIP. Select the Disable
SIP ALG check box to disable the SIP ALG. Disabling the SIP ALG might be useful when
you are running certain applications.
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 recognizes some of these applications and works correctly with
them, but other applications 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.
The modem router discards traffic from the Internet that is not a response to one of your
computers or a service that you have set up in the Port Forwarding/Port Triggering screen.
Instead of discarding this traffic, 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 ADVACNED > Setup > WAN Setup.
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47
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