PPPoX

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PPPoX (PPP over X)^[1] designates a family of encapsulating communications protocols implementing Point-to-Point Protocol.

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

References

^ "What Is PPP? Point-to-Point Protocol Explained (2025)". broadbandsearch.net. Retrieved 22 August 2025.

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