Why pppoe

All rights reserved. Your browser does not support the video tag. Structure of a PPPoE packet. This field is 4 bits long and must be set to 0x1. Networking diagram of PPPoE access. Working process of PPPoE. Configure-NAK If the negotiation options received in a Configure-Request packet are supported but some values are not acceptable, the receive end replies with a Configure-NAK packet that carries the expected values of the local device.

Configure-Reject If negotiation options received in a Configure-Request packet are not supported, the receive end replies with a Configure-Reject packet that carries the unsupported options. Related Topics. About This Topic. Enterprise APP. Follow Us. Indicates a PPPoE version number. Indicates a PPPoE type. Karl Billington Karl Billington 4, 7 7 silver badges 26 26 bronze badges.

A few reasons. Firstly that is just the way it has always been and ISPs are loath to change a working setup. Peter Green Peter Green PPPoE authentication is very weak and not followed by encryption, making it trivial to break and tamper with the traffic.

Why would it be relied on for identification instead if identifying the users based on which port they use on the DSLAM? Authentication is just determining who you are, and it has nothing to do with the traffic. The traffic in PPP is not normally encrypted, so the traffic could be tampered with, anyway, except that PPP is a Point-to-Point Protocol, so there are only two endpoints. DHCP, on the other hand, does nothing for authentication or encryption.

Adhidarma Hadiwinoto Adhidarma Hadiwinoto 11 2 2 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Configure network interfaces.

Configure PPPoE interfaces. From operational mode, enter the show interfaces command. When you enable CHAP on an interface, the interface can authenticate its peer and be authenticated by its peer. If you set the passive option to handle incoming CHAP packets only, the interface does not challenge its peer. However, if the interface is challenged, it responds to the challenge. If you do not set the passive option, the interface always challenges its peer.

Configure a PPPoE interface. From configuration mode, confirm your configuration by entering the show interfaces command.

To specify more than one tracing operation, include multiple flag statements. You can specify the following flags in the traceoptions statement:. Help us improve your experience. Let us know what you think. Do you have time for a two-minute survey?

Maybe Later. Understanding Point-to-Point Protocol over Ethernet Point-to-Point Protocol over Ethernet PPPoE combines PPP, which typically runs over broadband connections, with the Ethernet link-layer protocol that allows users to connect to a network of hosts over a bridge or access concentrator.

Note: A device cannot receive PPPoE packets from two different access concentrators on the same physical interface. The only difference is the encapsulation for the underlying interface to the access concentrator: If the interface is Ethernet, use a PPPoE encapsulation. Requirements Before you begin, configure an Ethernet interface. Configuration Procedure CLI Quick Configuration Step-by-Step Procedure Results CLI Quick Configuration To quickly configure this example, copy the following command, paste it into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the command into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode.

Step-by-Step Procedure The following example requires you to navigate various levels in the configuration hierarchy. Results From configuration mode, confirm your configuration by entering the show interfaces pp0 command. PPPoE working process includes two main phases:. And the hosts locate multiple PPPoE servers, and then allow the user to choose one. Session Phase—When the discovery phase completes successfully, both the host and the selected server have information about their PPP connection over the Ethernet.

Therefore, a session is established between an individual user and the remote site, which can be monitored. Meanwhile, the user billing is produced and recorded by PPPoE.