UTT Technologies
Chapter 7 Advanced
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6.4 PPPoE Server
This section describes how to configure PPPoE server global settings and PPPoE
account settings, and how to view PPPoE user status.
6.4.1 PPPoE Overview
The PPPoE stands for Point-to-Point Protocol over Ethernet, which uses client/server
model. The PPPoE provides the ability to connect the Ethernet hosts to a remote Access
Concentrator (AC) over a simple bridging access device. And it provides extensive access
control management and accounting benefits to ISPs and network administrators.
The PPPoE is a network protocol for encapsulating PPP frames in Ethernet frames to
provide point-to-point connection over an Ethernet network.
6.4.1.1 PPPoE Stages
As specified in RFC 2516, the PPPoE has two distinct stages: a discovery stage and a
PPP session stage. The following describes them respectively.
6.4.1.2 PPPoE Discovery Stage
In the PPPoE discovery stage, a PPPoE client will find a proper server, and then build the
connection. When a client initiates a PPPoE session, it should perform discovery to
indentify the PPPoE server’s Ethernet MAC address, and establish a PPPoE session ID.
PADI
PPPoE Client
PADO
PADR
PADS
PPPoE Server
Figure 6-21 PPPoE Discovery Stage Flows
As shown in Figure 7-21, the discovery stage includes the following four steps:
1.
PADI (PPPoE Active Discovery Initiation):
At the beginning, a PPPoE client
