User's Manual

Advanced Settings
139
N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700
Static Routes
Static routes provide additional routing information to your router. Under normal
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 have to
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 a
re employed. This router’s address on your LAN is 192.168.0.100.
• Your company’s network address is 134.177.0.0.
W
hen you first configured your router, two imp
licit static routes were created. A default route
was created with your ISP as the wireless modem router, 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 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 have to define a static route, t
elling your rou
ter that 134.177.0.0 should be
accessed through the ISDN router at 192.168.0.100. The static route setup would look like
Figure 57, Adding a static route.
In this example:
• The Destination IP
Address and IP Sub
net Mask fields specify that this static route
applies to all 134.177.x.x addresses.
• The Gateway I
P Address field specifies that all traffic for these addresses are to be
forwarded to the ISDN router at 192.168.0.100.
• The value in the Metric field repre
sents the number of routers between your network and
the destination. This is a direct connection, so it can be set to the minimum value of 2.
• The Private check box is selected on
ly as a precautionary security measure in case RIP
is activated.