What Is PPTP? (Everything You Need to Know) | CactusVPN
https://www.cactusvpn.com/beginners-guide-to-vpn/what-is-pptp/
Jan 22, 2019 · A PPTP connection is very cross-platform compatible. The protocol works on Windows, Linux, macOS, iOS, Android, Tomato, DD-WRT, and other operating systems and devices. PPTP uses GRE (General Routing Encapsulation), TCP port 1723, and IP port 47. PPTP supports encryption keys up to 128-bits, and it uses MPPE (Microsoft Point-to-Point Encryption).
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