How to check a PPPoE address ??

My ISP gives me a static IP address once PPPoE session is established.

Sometimes, for unknown reasons we are cheching with ISP, PPPoE session gives back a wrong IP address and no internet connection is possible.

For MT machine however, PPPoE is up and running , so it is valid as route (three wan here) so PC connection hangs in there.

How can I chech if PPPoE is up with right IP address thus declaring it up and running only in this case ??

Thanks