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N750 Wireless Dual Band Gigabit Router WNDR4300
WAN Setup
The WAN Setup screen lets you configure a DMZ (demilitarized zone) server, change the
maximum transmit unit (MTU) size, and enable the router to respond to a ping on the WAN
(Internet) port.
To view or change the WAN settings:
Select Advanced > Setup > W
AN Setup
The following settings are available:
• Disable Port Scan and DoS Protection. DoS protection protects your LAN against
denial of service attacks such as Syn flood, Smurf
Attack, Ping of Death, Teardrop
Attack, UDP Flood, ARP Attack, Spoofing ICMP, Null Scan, and many others. This should
be disabled only in special circumstances.
• 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, Default DMZ Server, for more
details.
• Respond to Ping on Internet Port. If you want the router to respond to a ping from the
Internet, select this check box. Use this setting only as a 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.
The IGPM Proxying feature lets a LAN computer receive the
multicast traffic directed to it from the Internet. Selecting this check box prevents this from
occurring.
• 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 Change the
MTU Size on page 39.
• NA
T 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,
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