Customers deploy ADSL they must support PPP-style authentication and authorization over a large installed base of legacy bridging customer premises equipment (CPE). PPPoE provides the ability to connect a network of hosts over a simple bridging access device to a remote access concentrator or aggregation concentrator. With this model, each host uses its own PPP stack. Therefore, it presents the user with a familiar user interface. PPPoE preserves the point-to-point session used by Internet Service Providers (ISPs) in the current dialup model. PPPoE is the only protocol capable to run point-to-point over Ethernet without the requirement of an intermediate IP stack.
