78 | Chapter 5: Advanced Configuration
N300 Wireless Gigabit ADSL2+ Modem Router DGN3500 User Manual
Setting up 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 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:
• Y
our primary Internet access is through a cable modem to an ISP.
• Y
ou 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.
• Y
our 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 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 must define a static route, telling your router that 134.177.0.0 should be
accessed t
hrough the ISDN router at 192.168.0.100. The static route setup would look like
Figure 41.
In this example:
• Th
e Destination IP Address and IP Subnet Mask fields specify that this static route
applies to all 134.177.x.x addresses.
• Th
e Gateway IP Address field specifies that all traffic for these addresses should be
forwarded to the ISDN router at 192.168.0.100.
• The
value in the Metric field represents 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 only as a precautionary security measure in case RIP
is activated.
Configuring Static Routes
1. Log in to the wireless modem router at its default LAN address of http://192.168.0.1
with its default user name of admin and default password of password, or using
whatever user name, password, and LAN address you have chosen for the wireless
modem router.
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