• The FortiGate units used in this example have interfaces named port1, port2, and port3.

• All FortiGate units in this example have factory default configuration, and are in NAT/Route mode.

• Basic firewalls are in place to allow unfiltered traffic between all connected interfaces in both directions.

• This OSPF network is not connected to any other OSPF networks.

• Both Internet connections are always available.

• The modem connection is very slow and expensive.

• Other devices may be on the network, but do not affect this basic configuration.

• Router3 is responsible for redistributing all routes into and out of the OSPF AS.