Point-to-Point Protocol over Ethernet
Point-to-Point Protocol over Ethernet (PPPoE) slightly modifies PPP. These modifications (defined in RFC 2516) enable PPP to be transported over Ethernet. PPPoE enables all of the benefits of dial-up PPP without the dial-up circuit.
PPPoE looks to the consumer like a dial-up connection, except faster. PPPoE uses the dial-up functionality of existing computer operating systems. For example, in Windows ME, the consumer would click on a “dial-up” icon. The consumer would then be connected to the ISP via PPPoE. However, instead of taking about one minute for a PPP session over a dial-up (i.e., POTS or ISDN) connection, a PPPoE connection is made in less than one second. Service providers like PPPoE because it allows them to use their existing PPP infrastructure.
Additionally, PPPoE controls access by a user, not by a box. This is important for security reasons. Suppose an unscrupulous customer with a 6 Mbps DSL connection decides to resell that bandwidth to his neighbors. PPPoE can prevent this by controlling the number of users authorized to access network resources. Multiple PCs can access the network across a single DSL connection, but only if they have been authorized by the service provider.
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