Network configuration Configuring routing
FortiGate-400 Installation and Configuration Guide 143
Configuring routing
This section describes how to configure FortiGate routing. You can configure routing
to add static routes from the FortiGate unit to local routers. Using policy routing you
can increase the flexibility of FortiGate routing to support more advanced routing
functions.
You can also use routing to create a multiple Internet connection configuration that
supports redundancy and load sharing between the two Internet connections.
For more information about configuring routing for multiple internet connections, and
for configuration examples, see “Configuration example: Multiple connections to the
Internet” on page 52
This section describes:
•Adding a default route
•Adding destination-based routes to the routing table
•Adding routes in Transparent mode
•Configuring the routing table
•Policy routing

Adding a default route

Use the following procedure to add a default route for network traffic leaving the
external interface.
1Go to System > Network > Routing Table.
2Select New to add a new route.
3Set the Source IP and Netmask to 0.0.0.0.
4Set the Destination IP and Netmask to 0.0.0.0.
5Set Gateway 1 to the IP address of the routing gateway that routes traffic to the
Internet.
6Select OK to save the default route.

Adding destination-based routes to the routing table

Use the following procedure to add destination-based routes to the FortiGate routing
table. Add destination-based routes to control the destination of traffic exiting the
FortiGate unit. You configure routes by adding destination IP addresses and netmasks
and adding gateways for these destination addresses. The gateways are the next hop
routers to which to route traffic that matches the destination addresses in the route.
You can add one or two gateways to a route. If you add one gateway, the FortiGate
unit routes the traffic to that gateway. You can add a second gateway to route traffic to
the second gateway if the first gateway fails.
Note: Only 1 default route can be active at any 1 time. If two default routes are added to the
routing table, only the default route closest to the top of the routing table is active.