Chapter 9 High Availability for FortiOS 5.0 : Configuring and connecting HA clusters : Example: NAT/Route mode active-passive HA configuration : General configuration steps
  
General configuration steps
The section includes web‑based manager and CLI procedures. These procedures assume that the FortiGate‑620B units are running the same FortiOS firmware build and are set to the factory default configuration.
General configuration steps
1. Configure the FortiGate units for HA operation.
Optionally change each unit’s host name.
Configure HA.
2. Connect the cluster to the network.
3. Confirm that the cluster units are operating as a cluster and add basic configuration settings to the cluster.
View cluster status from the web‑based manager or CLI.
Add a password for the admin administrative account.
Change the IP addresses and netmasks of the internal and external interfaces.
Add a default route.