The Point-to-Point Tunneling Protocol (PPTP) was designed to solve this problem of creating and maintaining a VPN over a public TCP/IP network using the common Point-to-Point Protocol (PPP).

• 作为一种比较成熟的VPN技术，PPTP被世界上许多用户广泛采用构建VPN。 设计PPTP的目的是在公共网络上使用PPP协议建立和维护VPN。