Wan Setup Screen Fields - NETGEAR N300 User Manual

N300 Wireless ADSL2+ Modem Router DGN2200v4

WAN Setup Screen Fields

The following fields are available:
• WAN Preference. By default this field is set to Auto-Detect so that the modem router
automatically detects if the Internet connection is through the ADSL port or the
WAN/Ethernet port 4. You can use this field to select Must use DSL WAN or Must use
Ethernet WAN.
• Use port 4 as. By default, Auto-Detect is selected so that the modem router detects if
Ethernet port 4 is used as a LAN or WAN port. For example, if you connect a computer to
Ethernet port 4, then it works as a LAN port. You can select LAN or WAN if you do not
want to use the auto-detect setting.
• 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,
• 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 feature 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.
• 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
MTU Size on page 38.
• 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. The Session Initiation Protocol (SIP) Application Level Gateway (ALG)
is enabled by default to optimize VoIP phone calls that use the SIP. Select the Disable
SIP ALG check box to disable the SIP ALG. Disabling the SIP ALG might be useful when
you are running certain applications.
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Default DMZ Server.
Change the