L2/bridge就是wired/wireless LAN在同一broadcast domain內,由AP根據MAC address判斷要不要在兩個LAN間forwarding packet(就是普通的switch
),好處是網芳這類broadcast oriented protocol不會受到影響,至於L3 NAT/routing則是根據IP address判斷要不要在兩個LAN間forwarding packet(兩個LAN在不同的IP subnet/broadcast domain下),好處是能兼作NAT/FW,壞處是除非針對網芳這類broadcast oriented protocol另外處理過(i.e. WINS server),不然是不會work的....