Chapter 1 What’s New for FortiOS 5.0 : New features in FortiOS 5.0 Patch 5 : FortiAP LAN port support : Restrictions
  
Restrictions
While the FortiAP-14C has four physical LAN ports, these ports must share the same configuration.
Any host connected to a LAN port will be taken as authenticated.
The use of dynamic VLANs for the host behind LAN port is not supported.
RADIUS MAC authentication for the host behind LAN port is not supported.