Hi guys …
Imagine, PPPoE termination works.
One of thousand of ADSL customers installed PPPoE server at home. The network now has two PPPoE servers. What way thousand computers of ADSL customers know which PPPoE server is right and which is wrong? …While fake PPPoE server is collecting passwords of thousand customer.
although I enabled client isolation .
please help me .
no replay 
please help me or i’m gonna lose my job
open winbox
ppp
pppoe scan
see whats out there
well thank you for your reply.
I know that there is a fake pppoe server and I added the mac address of the fake pppoe server to the access list and unchecked Authenticate and Default Forward . I also created IP firewall filter rules to drop all PPPoE traffic between wlan clients and only allow PPPoE traffic between the wlan and ether ports (client isolation) and blah blah blah and all security tips but with no luck .
Can I ask why did you add “fake pppoe server to the access list and unchecked Authenticate and Default Forward”???
Can you not trace the mac address of the fake PPPoE and just disconnect from your network.
thank you for your replay
the problem is the mac address of the fake pppoe server is being changed every 1 second 
.
At present I don’t use a centralized PPPoE server but one on each AP and each one uses a different IP range, You say 1000 customers and one rogue PPPoE which is changing it’s mac address every minute but this must also mean 999 mac addresses which do not change, can you not do overnight bulk disconnect sections of your network to isolate where this fake PPPoE is coming from?
On your AP did you turn off Default Forward so that wireless clients cannot talk to each other directly ?
Nick.
well , I have 4 aps evry one have 1000 clients.
thank you nickshore for your reply
Yes , I turned off Default Forward , but I don’t how he bypass that and communicate
with other clients .