title: PPPoX
text: # PPPoX
  
  PPPoX (PPP over X) 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
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