NETGEAR WNR200v4 user manual Default DMZ Server

N300 Wireless Router WNR2000v4

Respond to Ping on Internet Port. If you want the router to respond to a ping from the Internet, select this check box. By default, the check box is cleared. Use this option only as a diagnostic tool because it allows your 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 traffic they are subscribed to from the Internet. By default, this check box is selected, and the IGMP proxy is disabled, preventing multicast traffic 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 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. This is rarely required, and you should not do this unless you are sure that it is necessary for your ISP connection. For more information, see Change the MTU Size on page 47.

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. By default, the Secured radio button is selected.

•Open NAT provides a much less secured firewall, but allows almost all Internet applications to function.

Disable SIP ALG. Some Voice over IP (VoIP) applications do not function well with the Session Initiation Protocol (SIP) Application Layer Gateway (ALG). Selecting the check box to turn off the SIP ALG might enable connected VoIP devices to create and accept a VoIP call through the router. By default, the check box is cleared.

Default DMZ Server

The default DMZ server feature is helpful when you use 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 function 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.

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.

genie Advanced Home

46