(also The Point-to-Point Protocol over Ethernet)
A network protocol that encapsulates Point-to-Point Protocol (PPP) within the Ethernet link-layer protocol. PPPoE combines the security features of PPP and Ethernet, which supports multiple users on a LAN. PPPoE manages the data traveling over the cable networks. It also allows a single server connection to be divided between multiple clients. As a result, multiple clients can connect to the same server and access the internet simultaneously, unlike PPP, which allows only one-on-one connections. When PPPoE was first implemented, ISPs could start offering internet connection to more people.
See also: DHCP
History of PPPoE
PPPoE was developed by UUNET Technologies in 1999 to allow connecting multiple devices to the internet with a single broadband connection. At the time, most ISPs were still using dial-up connections, which made it challenging to provide always-on internet connectivity. As the internet scope and the demand for higher internet speeds grew, PPPoE offered a viable solution and became an industry standard.
PPPoE use cases
PPPoE is commonly used in residential broadband connections, such as DSL and fiber, to provide a secure connection between the user and their internet service provider. In the case of wireless networks, PPPoE establishes a secure connection between the user and their wireless access point. It is also used in corporate networks, where it allows users to access their corporate network safely.
- During the discovery stage, the PPPoE client sends out a message to the local network, asking for the MAC address of the PPPoE server. The server responds with its MAC address, which the client then uses to establish a session ID. After these initial steps are completed, the user can select the PPPoE server they wish to use.
- Once the connection is established, the session phase begins. PPPoE starts the data transfer, and the user can securely access the internet via PPP.