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Configuring PPPoE
Overview
Point-to-Point Protocol over Ethernet (PPPoE) extends PPP by transporting PPP frames encapsulated in
Ethernet over point-to-point links.
PPPoE specifies the methods for establishing PPPoE sessions and encapsulating PPP frames over Ethernet.
PPPoE requires a point-to-point relationship between peers instead of a point-to-multipoint relationship as
in multi-access environments such as Ethernet. PPPoE provides Internet access for the hosts in an Ethernet
through a remote access device and implement access control, authentication, and accounting on a
per-host basis. Integrating the low cost of Ethernet and scalability and management functions of PPP,
PPPoE gained popularity in various application environments, such as residential access networks.
For more information about PPPoE, see RFC 2516.
PPPoE network structure
PPPoE uses the client/server model. The PPPoE client initiates a connection request to the PPPoE server.
After session negotiation between them is complete, a session is established between them, and the
PPPoE server provides access control, authentication, and accounting to the PPPoE client.
Depending on the starting point of the PPPoE session, the following network structures are available:
• As shown in Figure 10
, the PPPoE session is established between routers (Router A and Router B). All
hosts share one PPPoE session for data transmission without being installed with PPPoE client
software. This network structure is typically used by enterprises.
Figure 10 Network structure 1
Router B
Host A Host B Host C
Modem
PPPoE server
PPPoE clientRouter A
DSLAM
Internet
Client device
Carrier device
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