Chapter 9 High Availability for FortiOS 5.0 : Configuring and connecting HA clusters : Example: NAT/Route mode active-passive HA configuration
  
Example: NAT/Route mode active-passive HA configuration
This section describes a simple HA network topology that includes an HA cluster of two FortiGate-620B units in NAT/Route mode installed between an internal network and the Internet.
Example NAT/Route mode HA network topology
General configuration steps
Configuring a NAT/Route mode active-passive cluster of two FortiGate-620B units - web‑based manager
Configuring a NAT/Route mode active-passive cluster of two FortiGate-620B units - CLI