Fortinet FortiGate 1U Quick Start Manual page 27

Connecting the network
Connect the FortiGate WAN1 interface to
your ISP-supplied equipment.
ISP
Connect the internal network to the FortiGate
internal interface (typically port 1).
Power on the ISP's equipment, the FortiGate
unit, and the PCs on the Internal network.
FortiGate
Internal Network
Configuring the FortiGate
unit's interfaces
From a PC on the Internal network, connect
to the FortiGate web-based manager using
either FortiExplorer or an Internet browser.
You can configure the PC to get its IP
address using DHCP and then browse
to https://192.168.1.99 . You could also
give the PC a static IP address on the
192.168.1.0/255.255.255.0 subnet.
Login using admin and no password.
Go to System > Network > Interface and.
Edit the wan1 interface.
Set the Addressing Mode to Manual and
the IP/Netmask to your public IP.
Connecting a private network to the Internet using NAT/Route mode 7