If you’ve got a fresh Fortigate and want to configure it as HA, you have to prepare something, because the factory-standard configuration doesn’t let you to enabled High Availability.
The preparation steps are as follows:
- Remove DHCP server settings
- Remove existing firewall policies
- Set the interface mode for all interfaces to static, because pppoe and dhcp modes are not supported in a HA cluster environment
- Set the hostname
- Set the mode for interfaces to internal-switch-mode interface