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Point-to-Point Tunneling Protocol

Point-to-Point Tunneling Protocol (PPTP) is a method for implementing VPN. PPTP uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets. The PPTP specification doesn’t describe encryption or authentication features and relies on the PPP protocol being tunneled to implement security functionality.

Microsoft Windows product families, implements various levels of authentication and encryption natively as standard features of the Windows PPTP stack.

A PPTP tunnel is instantiated by communication to the peer on TCP port 1723. This TCP connection is then used to initiate and manage a second GRE tunnel to the same peer.

The GRE tunnel is used to carry encapsulated PPP packets, allowing the tunnelling of any protocols that can be carried within PPP, including IP, NetBEUI and IPX.

In the Microsoft implementation, the tunneled PPP traffic can be authenticated with PAP, CHAP, Microsoft CHAP V1/V2 or EAP-TLS. The PPP payload is encrypted using Microsoft Point-to-Point Encryption (MPPE) when using MSCHAPv1/v2 or EAP-TLS.

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