If you look at the guide, you can manage LAN <-> WAN traffic in different ways (by IP address, service type etc). There are a number of examples in the guide. You cannot manage LAN <-> LAN traffic. If you use a switch to connect your devices on the LAN, same subnet traffic does not even hit ClearOS.

can i manage LAN traffic ?

Hello Faizal,

There are quite a number of examples in the Bandwidth Manager User Guide... that should help.