| Term | Description |
| PPTP | PPTP (Point-to-Point Tunneling Protocol - RFC 2637) is an extension to the PPP protocol designed for VPN, that allows for private "tunnels" over the public Internet. Generally, such tunneling refers to the ability to encapsulate packets of data formatted for one network protocol in packets used by another protocol (usually transfer of TCP/IP data over a non-TCP/IP network). PPTP uses port 1723/tcp. |