Fortinet FortiGate 1U Quick Start Manual page 175

For the corporate network, set Type to
Subnet and use the corporate network's
IP address. Set Interface to an internal
interface.
Creating security policies
Go to Policy > Policy > Policy.
Create a policy that allows remote wireless
users to access the Internet. Set the
Incoming Interface to the SSID and the
Outgoing Interface as your Internet-facing
interface.
Providing remote users access to the corporate network and Internet 155