Configure Wan Settings - NETGEAR DGN2200M User Manual

N300 Wireless ADSL2+ Modem Router DGN2200M Mobile Edition

Configure WAN Settings

In the main menu, under Advanced, select WAN Setup to display the following screen.
Table 11. WAN settings
Setting
Disable SPI Firewall
Default DMZ Server
Respond to a Ping on an Internet
WAN Port
MTU Size
NAT Filtering
Disabling the SIP ALG
Description
The SPI (stateful packet inspection) firewall protects your LAN against
denial of service attacks. This should be disabled only in special
circumstances.
See Set Up a Default DMZ Server
If you want the wireless modem router to respond to a ping from the
Internet, select the Respond to Ping on Internet Port check box. This
should be used only as a diagnostic tool, since it allows your wireless
modem router to be discovered. Do not select this check box unless you
have a specific reason to do so.
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. But this is rarely required and
should not be done unless you are sure it is necessary for your ISP
connection.
This option determines how the router deals with inbound traffic. The
Secured option provides a secured firewall to protect the computers on
LAN from attacks from the Internet, but it might cause some Internet
games, point-to-point applications, or multimedia applications not to work.
The Open option, on the other hand, provides a much less secured
firewall, while it allows almost all Internet applications to work.
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.
Advanced Configuration
76
on page 77.