Point-to-Point Tunneling Protocol (PPTP)
K. Hamzeh, G. Pall, W. Verthein, J. Taarud, W. Little, Glen Zorn · 1999
The PPTP protocol was developed by a vendor consortium.The documentation of PPTP is provided as information to the Internet community.The PPP WG is currently defining a Standards Track protocol (L2TP) for tunneling PPP across packet-switched networks.