title: PPPoX
text: 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
  
  Tunneling protocols