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N300 Wireless Router WNR2000v4
diagnostic tool because it allows your router to be discovered. Do not select this check box
unless you have a specific reason.
Disable IGMP Proxying. IGMP proxying allows computers on the LAN to receive the
multicast traffic they are subscribed to from the Internet. By default, this check box is
selected, and the IGMP proxy is disabled, preventing multicast traffic from the Internet to the
LAN. Clear the Disable IGMP Proxying check box to allow multicast traffic from the Internet
to the LAN.
MTU Size (in bytes). The normal maximum transmit unit (MTU) 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, and you should not do this unless you are
sure that it is necessary for your ISP connection. For more information, see
Change the MTU
Size on page 48.
NAT Filtering. Network Address Translation (NAT) determines how the 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. By default, the Secured radio
button is selected.
• Open NAT provides a much less secured firewall, but allows almost all Internet
applications to function.
Disable SIP ALG. Some Voice over IP (VoIP) applications do not function well with the
Session Initiation Protocol (SIP) Application Layer Gateway (ALG). Selecting the check box
to turn off the SIP ALG might enable connected VoIP devices to create and accept a VoIP
call through the router. By default, the check box is cleared.
Default DMZ Server
The default DMZ server feature is helpful when you use some online games and
videoconferencing applications that are incompatible with Network Address Translation
(NAT). The router is programmed to recognize some of these applications and to function
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 router unless the traffic is a
response to one of your local computers or a service that you have configured on the Port