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N300 Wireless ADSL2+ Modem Router DGN2200v3
WAN Setup
Select Advanced > WAN Setup to display the following screen:
The following settings are available:
• Disab
le Port Scan and DoS Protection. The firewall protects your LAN against port
scans and denial of service (DoS) attacks. This protection should be disabled only in
special circumstances.
• Default DMZ Server. The def
ault demilitarized zone (DMZ) server feature is helpful when
you use online games and video conferencing applications that are incompatible with
NAT. See Default DMZ Server on
page 79.
• Resp
ond to Ping on Internet Port. If you want the modem router to respond to a ping
from the Internet, select this check box. This should be used 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 to do so.
• 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. But this is rarely required, and should not be done unless you
are sure it is necessary for your ISP connection.
• NA
T Filtering. By default NAT filtering is used.
• Disa
ble SIP ALG. The Session Initiation Protocol (SIP) Application Level Gateway (ALG)
is enabled by default to optimize VoIP phone calls that use the SIP. The Disable SIP ALG
check box allows you to disable the SIP ALG. Disabling the SIP ALG might be useful
when running certain applications.
• Disable
IGMP Proxying. The IGPM Proxying feature lets a LAN PC receive the multicast
traffic directed to it from the Internet. Selecting this check box prevents this from occuring.