in this situation

192.168.1.5/24
client a ---------->
Wireless AP 192.168.1.1/24 -----> internet
client b ---------->
192.168.1.6/24

with simple queues control cient a ---- internet or client b ------internet
but client a ---- client b have full bandwith

how to control this traffic interclient? and apply firewall to block any port interclient?

Marcelo