Default Dmz Server - NETGEAR D6300 User Manual

• Default DMZ Server. This feature is sometimes helpful when you are playing online
games or videoconferencing. Be careful when using this feature because it makes the
firewall security less effective. See the following section,
details.
• Respond to Ping on Internet Port. If you want the modem router to respond to a ping
from the Internet, select this check box. Use this only as a diagnostic tool because it
allows your modem router to be discovered. Do not select this check box unless you have
a specific reason.
• 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 change is rarely required, and should not be done unless
you are sure that it is necessary for your ISP connection. See
page 51.
• Disable IGMP Proxying. The IGMP Proxying function lets a LAN computer receive the
multicast traffic it is interested in from the Internet. Click this check box to disable the
function if you do not need it.
• 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. 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 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 modem router unless the traffic is a
response to one of your local computers or a service that you have configured in the Port
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