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A specification for PPTP was published as RFC 2637. PPTP has not been proposed or ratified as a standard by the IETF.
PPTP works by sending a regular PPP session to the peer with the Generic Routing Encapsulation (GRE) protocol. A second session on TCP port 1723 is used to initiate and manage the GRE session. PPTP is difficult to forward past a network firewall because it requires two network sessions. As such, firewalls are unable to let pass this traffic flawlessly, resulting in an inability to connect.
PPTP connections are authenticated with Microsoft MSCHAP-v2 or EAP-TLS. VPN traffic is optionally protected by Microsoft Point-to-Point Encryption (MPPE), which is described by RFC 3078.
PPTP enables you to encrypt and encapsulate in an IP header multi-protocol traffic that then is sent across an IP network or a public IP network, such as the Internet. You can use PPTP for remote access and site-to-site VPN connections. When using the Internet as the VPN public network, the PPTP server is a PPTP-enabled VPN server with one interface on the Internet and a second interface on the intranet.
Encapsulation: PPTP encapsulates PPP frames in IP datagrams for network transmission. PPTP uses a TCP connection for tunnel management and a modified version of Generic Routing Encapsulation (GRE) to encapsulate PPP frames for tunneled data. Payloads of the encapsulated PPP frames can be encrypted, compressed, or both.
Encryption: The PPP frame is encrypted with Microsoft Point-to-Point Encryption (MPPE) by using encryption keys generated from the MS-CHAPv2 or EAP-TLS authentication process. VPN clients must use the MS-CHAPv2 or EAP-TLS authentication protocol so that the payloads of PPP frames to be encrypted. PPTP is taking advantage of the underlying PPP encryption and encapsulating a previously encrypted PPP frame.
The protocol was developed by a vendor consortium formed by Microsoft, Ascend Communications (today part of Alcatel-Lucent), 3COM, and others, as described by the RFC document.[1]
MSCHAP-v2 can be compromised if users choose weak passwords. The certificate-based EAP-TLS provides a superior security option for PPTP.
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