Mikrotik in bridge don't forward the PPPoE discovery

I have a minirouter client connected in a mikrotik bridge and I need to do authentication in another server PPPoE. My wireless network is only bridge. I can’t do the authentication in the mikrotik, because the PPPoE server is running in my gateway. I need to do authentication in the PPPoE Server (gateway) but the mikrotik doesn’t forward the PPPoE discovery to my PPPoE Server. The option “default forward” is enable in interface bridge, but it doesn’t function. How do I do? Any Ideas?
network.jpg

First of all you have to ensure that Tsunami is forwarding frames to MikroTik router,
then MikroTik Router should have bridge (default forwarding option is related to clients, allow/disallow connection between the clients), transparent bridge for the wireless network example for the MikroTik router,
http://wiki.mikrotik.com/wiki/Transparently_Bridge_two_Networks

I added a new archive to study. It’s functioning today through TCP/IP but I want to change authentication it saw PPPoE in client AP Routers (WL-5460 AP). I have another cell wireless that the PPPoE authentication is functioning, but the Access Point is Orinoco AP-1000. I will obtain this only with WDS mode in a mikrotik? Regards, Adriano.
network2.jpg