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PPP & PPPoE Explained: Link Setup, Authentication and PADI‑PADO Process

It covers PPP and PPPoE link establishment, authentication schemes and the complete PADI‑PADO discovery workflow.

ruilixin6

Published August 23, 2026

PPP & PPPoE Explained: Link Setup, Authentication and PADI‑PADO Process

Project description

【Preliminary Note】The original hardware example in this article was written based on the RP2040. The actual hardware used in this hands-on demonstration features the W55RP20 as the main controller chip. The circuit logic and UF2 flashing operation principles are universally applicable, with only the main controller model differing. The original chip model mentioned in the circuit descriptions below is provided for reference purposes only. PPP Protocol and PPPoE Protocol PPP (Point‑to‑Point Protocol) is a data‑link‑layer communication protocol. It is widely used to transmit packets of…

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