Netgear DGN2200M DGN2200M User Manual (PDF) - Page 75

Configuring WAN Settings, Respond to Ping on Internet Port, Disable SIP ALG - specification

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N300 Wireless ADSL2+ Modem Router DGN2200M Mobile Edition User Manual Configuring WAN Settings In the main menu, under Advanced, select WAN Setup to display the following screen. Table 13. WAN Settings Setting Description Disable SPI Firewall The SPI (Stateful Packet Inspection) firewall protects your LAN against denial of service attacks. This should only be disabled in special circumstances. Default DMZ Server See Setting Up a Default DMZ Server on page 76. Respond to a Ping on an Internet WAN Port 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. MTU Size 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. NAT Filtering This option determines how the router deals with inbound traffic. The Secured option provides a secured firewall to protect the PCs 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. Disabling the 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. Chapter 6. Advanced Configuration | 75

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Chapter 6.
Advanced Configuration
|
75
N300 Wireless ADSL2+ Modem Router DGN2200M Mobile Edition User Manual
Configuring WAN Settings
In the main menu, under Advanced, select WAN Setup to display the following screen.
Table 13.
WAN Settings
Setting
Description
Disable SPI Firewall
The SPI (Stateful Packet Inspection) firewall protects your LAN against
denial of service attacks. This should only be disabled in special
circumstances.
Default DMZ Server
See
Setting Up a Default DMZ Server
on page 76.
Respond to a Ping on an Internet
WAN Port
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.
MTU Size
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.
NAT Filtering
This option determines how the router deals with inbound traffic. The
Secured
option provides a secured firewall to protect the PCs 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.
Disabling the 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.