PPPoX (PPP over X) designates a family of encapsulating communications protocols implementing Point-to-Point Protocol.

This article may be too technical for most readers to understand. (July 2020)

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Specific implementations:

• PPPoE: PPP over Ethernet – which can use 802.1q VLANs
• PPPoA: PPP over ATM
• PPTP: PPP encapsulated over GRE with a parallel control connection and some optional encryption
• L2TP v2 (and its ancestor L2F): PPP sessions multiplexed within tunnels and transported over UDP

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