NETGEAR DGND3300 - Manual (Page 84)

RangeMax Dual Band Wireless-N Modem Router DGND3300 User Manual
5-14 Customizing Your Network Settings
v1.0, March 2009
Configuring Static Routes
Static routes provide additional routing information to your modem router. Under usual
circumstances, the modem 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 192.168.0.100.
• Your company’s network address is 134.177.0.0.
When you first configured your modem 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 192.168.0.x addresses. With this configuration, if you attempt to access a device on
the 134.177.0.0 network, your modem router forwards your request to the ISP. The ISP forwards
your request to the company where you are employed, and the request is likely to be denied by the
company’s firewall.
In this case you must define a static route, telling your modem router that 134.177.0.0 should be
accessed through the ISDN router at 192.168.0.100.
In this example:
• The Destination IP Address and IP Subnet Mask fields specify that this static route applies
to all 134.177.x.x addresses.
• The Gateway IP Address field specifies that all traffic for these addresses should be
forwarded to the ISDN router at 192.168.0.100.
• A Metric value of 1 will work since the ISDN router is on the LAN.
• Private is selected only as a precautionary security measure in case RIP is activated.