- Go to Network > Interfaces and edit the Internet-facing interface (in this example, wan1).
- Set the Estimated Bandwidth for the interface based on your Internet connection.
- Set Role to WAN.
- To determine which Addressing mode to use, check if your ISP provides an IP address for you to use or if the ISP equipment uses DHCP to assign IP addresses.
- If your ISP provides an IP address, set Addressing mode to Manual and set the IP/Network Mask to that IP address.
- If your ISP equipment uses DHCP, set Addressing mode to DHCP to allow the equipment to assign an IP address to WAN1.
- Edit the lan interface, which is called internal on some FortiGate models.
If your FortiGate doesn't have a default LAN interface, you can use either an individual interface or create a software switch to combine the separate interfaces into a single virtual interface.
- Set Role to LAN.
- Set Addressing mode to Manual and set the IP/Network Mask to the private IP address you want to use for the FortiGate.
- If you need to assign IP addresses to devices on your internal network, enable DHCP Server.