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46
N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2
WAN Setup
The WAN Setup screen lets you configure a DMZ (demilitarized zone) server, change the
maximum transmit unit (MTU) size, and enable the wireless modem router to respond to a
ping on the WAN (Internet) port. Select Advanced > Setup > WAN Setup to view the
following screen:
• 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. T
his feature is sometimes helpful when you are playing online
games and/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
wireless 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 wireless 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 is rarely required, and should not be done unless you are
sure it is necessary for your ISP connection. See Change the MTU Size on pag
e 48.
• NAT Filtering. Network Address T
ranslation (NAT) determines how the wireless 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.
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