PPTP
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Definición
Point-to-Point Tunneling Protocol. Uno de los protocolos VPN más antiguos, desarrollado por Microsoft. PPTP es rápido pero se considera criptográficamente comprometido; no debe usarse donde la seguridad sea una preocupación.
PPTP's Architecture and Original Appeal
Point-to-Point Tunneling Protocol was developed by Microsoft in 1999 and became the first widely deployed VPNVirtual Private Network. A technology that creates an encrypted tunnel between a device and a remote server, protecting data in transit and masking the user's real IP address. Used for privacy, security, and accessing restricted networks. protocol for consumer and enterprise use. It encapsulates PPP frames inside TCPTransmission Control Protocol. A reliable, connection-oriented transport protocol that guarantees ordered, error-checked delivery of data through three-way handshakes, acknowledgments, and retransmission. The foundation of HTTP, SSH, and most internet services. (port 1723) and uses a separate GRE stream for data. Its appeal was simplicity — built into every Windows version, requiring no additional client software.
Critical Security Weaknesses
PPTP's MS-CHAPv2 authentication is fundamentally broken. The 56-bit DES encryption it relies on can be cracked in under 24 hours with dedicated hardware, and the authentication handshake leaks enough information to allow offline dictionary attacks. The NSA is widely believed to be able to decrypt PPTP traffic in bulk. Modern IPSecInternet Protocol Security. A suite of protocols that authenticates and encrypts IP packets at the network layer. Used in site-to-site VPNs and as the transport layer for L2TP/IPSec and IKEv2 VPN connections.-based protocols and WireGuardA modern, lightweight VPN protocol that uses state-of-the-art cryptography (ChaCha20, Curve25519) with a minimal codebase (~4,000 lines). Designed for simplicity, high performance, and low latency compared to OpenVPN and IPSec. offer security properties that PPTP cannot approach.
Current Status
PPTP is considered deprecated for security-sensitive use. It persists only in legacy environments where compatibility with old Windows clients is required and confidentiality is not a concern. Any VPN infrastructure using PPTP should be migrated to IKEv2Internet Key Exchange version 2. A VPN protocol used with IPSec that excels at quickly re-establishing connections after network changes (MOBIKE), making it ideal for mobile devices switching between Wi-Fi and cellular., OpenVPN, or WireGuard. A DNS Leak Test and WebRTC leak test are good first steps when auditing VPN configurations after migration.