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54 Mbps Wireless Router WGR614v8 User Manual
4-8 Customizing Your Network Settings
v1.1, May 2008
Configuring 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. For more information about NAT, see “How Your Computer
Accesses a Remote Computer through Your Router” on page 5-2.
To change the NAT option:
1. In the NAT Filtering area, select either the Secured or the Open radio button.
2. Click Apply to save the new configuration.
Disabling SIP ALG
Short for Session Initiation Protocol, SIP is a signaling protocol for Internet Telephony. SIP can
establish sessions for features such as audio/videoconferencing, interactive gaming, and call
forwarding to be deployed over IP networks, thus enabling service providers to integrate basic IP
telephony services with Web, e-mail, and chat services.
In most cases, you do not have to disable the SIP ALG. However, if your SIP applications cannot
work with the router, you can disable the SIP ALG and try the applications again.
Configuring Static Routes
Static routes provide additional routing information to your router. Under usual circumstances, the
router has adequate routing information after it has been configured for Internet access, and you do
not need to configure additional static routes. You must configure static routes only for unusual
cases such as multiple routers or multiple IP subnets located on your network.
As an example of when a static route is needed, consider the following case:
• Your primary Internet access is through a cable modem to an ISP.
• You have an ISDN router on your home network for connecting to the company where you are
employed. This router’s address on your LAN is 192.168.1.100.
• Your company’s network address is 134.177.0.0.
When you first configured your router, two implicit static routes were created. A default route was
created with your ISP as the gateway, and a second static route was created to your local network
for all 192.168.1.x addresses. With this configuration, if you attempt to access a device on the