Chapter 1 What’s New for FortiOS 5.0 : New features in FortiOS 5.0 Patch 5 : FortiAP LAN port support : Bridging with the WAN port
  
Bridging with the WAN port
Bridging the LAN port with the WAN port allows the FortiAP unit to be used as a hub which is also an access point.
This configuration has the following features:
The IP addresses for LAN clients come from the WAN directly and will typically be in the same range as the AP itself.
All LAN client traffic is bridged directly to the WAN interface.
Communication between wireless and LAN clients can only occur if a policy on the FortiGate unit allows it.