I'm trying to grasp why L2TP is based on PPP. I thought PPP was a protocol for point-to-point situations where you don't have Ethernet. So why/how is L2TP using PPP in order to establish communication between a Windows 10 client pc and a router that acts as a L2TP server? The whole path between the client pc and the router is ethernet based.
Wouldn't L2TP have to be based on PPPoE instead in such scenarios?