Figure 2. The TCP/IP model or Internet layering scheme and its relation to some common protocols.
A small example network with eight vertices and ten edges

On the customer-premises equipment, PPPoE may be implemented either in a unified residential gateway device that handles both DSL modem and IP routing functions or in the case of a simple DSL modem (without routing support), PPPoE may be handled behind it on a separate Ethernet-only router or even directly on a user's computer.

- Point-to-Point Protocol over Ethernet

ppp0 is a PPPoE interface, which is configured as the default route in this example.

- IP routing
Figure 2. The TCP/IP model or Internet layering scheme and its relation to some common protocols.

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