Queue

Hi,
I have read this section on the manual http://www.mikrotik.com/docs/ros/2.9/root/queue.content#6.54.6.3 and at the end of this section there is the example of pcq.

I have this scenario, I have 100 PPOE clients that have dinamic IP pool.
On the manual section there is the example to limit single client based on the ip address. But how to limit a single client for specific protocol that have ip assigned by dhcp?

Best regards
Massimo