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
As shown in Figure 11, a PPPoE session is established between each host (PPPoE client) and the carrier router (PPPoE server). The service provider assigns an account to each host for billing and control. The host must be installed with PPPoE client software.
Figure 11: Network structure 2
