FortiGate Administration Guide - FirewallShop.com

Static Route
Router Static
Default route and default gateway
In the factory default configuration, entry number 1 in the Static Route list is
associated with a destination address of 0.0.0.0/0.0.0.0, which means any/all
destinations. This route is called the “static default route”. If no other routes are
present in the routing table and a packet needs to be forwarded beyond the
FortiGate unit, the factory configured static default route causes the FortiGate unit
to forward the packet to the default gateway.
To prevent this you must either edit the factory configured static default route to
specify a different default gateway for the FortiGate unit, or delete the factory
configured route and specify your own static default route that points to the default
gateway for the FortiGate unit.
For example, consider Figure 146, which shows a FortiGate unit connected to a
router. To ensure that all outbound packets destined to any network beyond the
router are routed to the correct destination, you must edit the factory default
configuration and make the router the default gateway for the FortiGate unit.
Figure 146:Making a router the default gateway
Internet
192.168.10.1
Router
external
FortiGate_1
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
FortiGate Version 3.0 MR5 Administration Guide
236 01-30005-0203-20070830