User Manual

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36
N600 Wireless Dual Band Gigabit Router WNDR3700v4
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
> WAN Setup
The following settings are available:
• Disable Port Scan and DoS Protection. DoS p
rotection 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. T
his 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 fea
ture 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 p
age 38.
• 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