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N150 Wireless ADSL2+ Modem Router DGN1000Bv3
• 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. For more information, see the following section, Default
DMZ Server.
• 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. IGMP proxying allows computers on the LAN to receive the
multicast traf
fic they are subscribed to from the Internet. By default, this check box is
selected, and the IGMP proxy is disabled, preventing multicast traf
fic from the Internet
to the LAN. Clear the Disable IGMP Proxying check box to allow multicast traffic
from the Internet to the LAN.
• 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. Reduce the MTU only if you are sure that it
is necessary for your ISP connection. For more information, see
Change the MTU
Size on page 51.
• 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. By default,
the Secured radio button is selected.
-
Open NA
T. 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.
• VPN Passthrough. When the modem router has Network
Address
Translation (NAT)
enabled, it filters encrypted tunnel packets through NAT, causing these packets to
become invalid. VPN pass-through allows encrypted tunnel packets to go through
without being filtered, and is enabled by default for IPSec, PPTP, and L2TP packets.
Do not disable VPN pass-through for IPSec, PPTP, or L2TP unless you have a
specific reason.
3. Click the Apply button.
Your settings are saved.