How to mangle PPPoE traffic

Hi,

I want to install between pppoe clients and pppoe server a transparent traffic shapper in bridge mode, but I can’t see any of the pppoe traffic which passes through it. Now I want to know is there a way to mangle and identify pppoe traffic, to look inside each pppoe packet. With Allot NetEnforcer this is possible, but with RouterOS, I couldn’t find the way of doing it.

Regards

Faton