NETGEAR WNR2200 - Setting Up a Default DMZ Server

N300 Wireless Router with USB WNR2200 User Manual
Customizing Your Network Settings 6-8
v1.0, May 2011
Setting Up a Default DMZ Server
The default DMZ server feature is helpful when you are using some online games and
videoconferencing applications that are incompatible with Network Address Translation (NAT).
The router is programmed to recognize some of these applications and to work correctly with
them, but there are other applications that might not function well. In some cases, one local
computer can run the application correctly if that computer’s IP address is entered as the default
DMZ server.
Disable IGMP Proxying IGPM (Internet Group Management Protocol) proxying is disabled by default.
When IGPM proxying is enabled, your router acts as an IGMP-based host,
forwarding IGMP messages and responding to IGMP queries.
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, and should not be done
unless you are sure it is necessary for your ISP connection. See “Changing
the MTU Size” on page 7-6.
NAT Filtering Network Address Translation (NAT) determines how the 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 Select this feature if you have a SIP (Session Initiation Protocol) telephone or
other SIP base devices, and you want them to communicate with other
people. If you have been unable to build a successful SIP connection,
selecting this check box allows for such a connection without compromising
other SIP ALG (Application-level gateway) firewall settings, such as Disable
SPI Firewall. If you are not using SIP devices, leave this check box
unchecked.
Warning: DMZ servers pose a security risk. A computer designated as the default DMZ
server loses much of the protection of the firewall and is exposed to exploits
from the Internet. If compromised, the DMZ server computer can be used to
attack other computers on your network.
Table 6-2. WAN Setup Settings
Setting Description