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Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
Advanced Configuration 6-9
Using Static Routes
Static Routes provide additional routing information to your gateway. Under normal
circumstances, the gateway 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.
Static Route Example
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 is 134.177.0.0.
When you first configured your gateway, 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 gateway will forward your request to the ISP. The ISP forwards
your request to the company where you are employed, and the request will likely be denied by the
company’s firewall.
In this case you must define a static route, telling your gateway that 134.177.0.0 should be
accessed through the ISDN router at 192.168.0.100. The static route would look like Figure 6-5.
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 fields 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.
This represents the number of routers between your network and the destination. This is a
direct connection so it is set to 1.
• Private is selected only as a precautionary security measure in case RIP is activated.