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The PPTP implementation that ships with the Microsoft Windows product families implements various levels of authentication and encryption natively as standard features of the Windows PPTP stack. The intended use of this protocol is to provide security levels and remote access levels comparable with typical VPN products.
PPTP (Point-to-Point Tunneling Protocol) is a form of PPP between two hosts via GRE using encryption and compression . As a layer 2 protocol between both ends of a tunnel [ edit ]
In computer networking, Secure Socket Tunneling Protocol (SSTP) is a form of virtual private network (VPN) tunnel that provides a mechanism to transport Point-to-Point Protocol (PPP) traffic through an SSL/TLS channel.
Microsoft Point-to-Point Encryption (MPPE) encrypts data in Point-to-Point Protocol (PPP)-based dial-up connections or Point-to-Point Tunneling Protocol (PPTP) virtual private network (VPN) connections. 128-bit key (strong), 56-bit key, and 40-bit key (standard) MPPE encryption schemes are supported.
The service can be connected to by two ways, by connection via a third-party OpenVPN client or through PPTP. The Mac OS X, iOS, Android, Ubuntu, and Windows operating systems all have PPTP support built in. The software (OpenVPN clients) can be used also, that provides the protocol stack, file system, and process scheduling.
Strict source route bit. For PPTP GRE packets, this is set to 0. Recur (3 bits) Recursion control bits. For PPTP GRE packets, these are set to 0. A (1 bit) Acknowledgment number present. Set to 1 if an acknowledgment number is supplied, indicating a PPTP GRE acknowledgment packet. Flags (4 bits) Flag bits. For PPTP GRE packets, these are set to 0.
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