Chapter 23 WAN Optimization, Web Cache, Explicit Proxy, and WCCP : Example network topologies : WAN optimization topologies : Topology for multiple networks
  
Topology for multiple networks
As shown in Figure 316, you can create multiple WAN optimization configurations between many private networks. Whenever WAN optimization occurs, it is always between two FortiGate units, but you can configure any FortiGate unit to perform WAN optimization with any of the other FortiGate units that are part of your WAN.
Figure 316: WAN optimization among multiple networks
You can also configure WAN optimization between FortiGate units with different roles on the WAN. FortiGate units configured as security devices and for WAN optimization can perform WAN optimization as if they are single-purpose FortiGate units just configured for WAN optimization.