Default Routes And Static Routes; Example Default Route To An External Network - Fortinet FortiGate FortiGate-800 Installation And Configuration Manual

Transparent mode installation

Default routes and static routes

Example default route to an external network

FortiGate-800 Installation and Configuration Guide
This section describes:
• Default routes and static routes
• Example default route to an external network
• Example static route to an external destination
• Example static route to an internal destination
To create a route to a destination, you need to define an IP prefix which consists of an
IP network address and a corresponding netmask value. A default route matches any
prefix and forwards traffic to the next hop router (otherwise known as the default
gateway). A static route matches a more specific prefix and forwards traffic to the next
hop router.
Default route example
:
IP Prefix 0.0.0.0 (IP address)
0.0.0.0 (Netmask)
Next Hop 192.168.1.2
Static Route example
IP Prefix 172.100.100.0 (IP address)
255.255.255.0 (Netmask)
Next Hop 192.168.1.2
Note: When adding routes to the FortiGate unit, add the default route last so that it appears on
the bottom of the route list. This makes sure that the unit attempts to match more specific routes
before selecting the default route.
Figure 11 shows a FortiGate unit where all destinations, including the management
computer, are located on the external network. To reach these destinations, the
FortiGate unit must connect to the "upstream" router leading to the external network.
To facilitate this connection, you must enter a single default route that points to the
upstream router as the next hop/default gateway.
Transparent mode configuration examples
65