Chapter 23 WAN Optimization, Web Cache, Explicit Proxy, and WCCP : Configuration examples : Example: Adding secure tunneling to an active-passive WAN optimization configuration : Network topology and assumptions
  
Network topology and assumptions
This example configuration includes a client-side FortiGate unit called Client-net with a WAN IP address of 172.30.120.1.This unit is in front of a network with IP address 172.20.120.0. The server-side FortiGate unit is called Web-servers and has a WAN IP address of 192.168.20.1. This unit is in front of a web server network with IP address 192.168.10.0.
Figure 333: Example active-passive WAN optimization and secure tunneling topology