Fortinet FortiGate Series Administration Manual page 341

Router Static
FortiGate Version 4.0 MR1 Administration Guide
01-410-89802-20090903
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Figure 178: Making a router the default gateway
Internet
192.168.10.1
external
internal
Internal network
192.168.20.0/24
To route outbound packets from the internal network to destinations that are not on
network 192.168.20.0/24, you would edit the default route and include the following
settings:
• Destination IP/mask: 0.0.0.0/0.0.0.0
• Gateway: 192.168.10.1
• Device: Name of the interface connected to network 192.168.10.0/24 (for example
"external").
• Distance: 10
The Gateway setting specifies the IP address of the next-hop router interface to the
FortiGate external interface. The interface behind the router (192.168.10.1) is the default
gateway for FortiGate_1.
In some cases, there may be routers behind the FortiGate unit. If the destination IP
address of a packet is not on the local network but is on a network behind one of those
routers, the FortiGate routing table must include a static route to that network. For
example, in Figure 179, the FortiGate unit must be configured with static routes to
interfaces 192.168.10.1 and 192.168.11.1 in order to forward packets to Network_1 and
Network_2 respectively.
Gateway
Router
FortiGate_1
Static Route
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