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S12700 V200R011C10 Configuration Guide - User Access and Authentication

This document describes the working mechanisms, configuration procedures, and configuration examples of User Access and Authentication features, such as AAA, DAA, NAC, PPPoE, Policy Association, and IP session.

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Overview of PPPoE

Overview of PPPoE


Point-to-Point Protocol (PPP) is a link layer protocol that encapsulates and transmits network layer packets over point-to-point links. PPP is widely used because it provides user authentication methods, supports synchronous and asynchronous communication, and is easy to extend.

PPP over Ethernet (PPPoE) is also a link layer protocol that provides point-to-point connections over the Ethernet. It sets up PPP sessions and provides a method to encapsulate PPP data packets. PPPoE is an enhanced protocol of PPP.


People want to connect to multiple hosts at a remote site through the same access device. The access device is expected to provide access control and accounting for these hosts in a manner similar to dial-up access using PPP. PPPoE can help people achieve this goal at a lower cost because Ethernet is the most cost-effective among all access technologies. Moreover, PPP provides the access control and accounting functions.

PPPoE allows a large number of hosts on an Ethernet to connect to the Internet through a remote access device and controls each host by using the PPP protocol. PPPoE applies to various scenarios, and provides high security as well as convenient accounting.

The PPPoE technology addresses many issues on networks, for example, accounting for users, and is widely used by broadband access carriers.


Due to the point-to-point feature, PPPoE can centrally manage and control access users. PPPoE brings the following benefits:
  • PPPoE separates access users from each other, and protects the network against ARP attacks. It is especially applicable to campus networks.

  • PPPoE requires authentication and network parameter negotiation, so it avoids IP address conflict, bogus DHCP servers, and IP address spoofing.

Updated: 2019-10-21

Document ID: EDOC1000178117

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