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The Point-to-Point Tunneling Protocol (PPTP) is an obsolete method for implementing virtual private networks. PPTP has many well known security issues. PPTP uses a TCP control channel and a Generic Routing Encapsulation tunnel to encapsulate PPP packets. Many modern VPNs use various forms of UDP for this same functionality.
Template {{Internet protocol suite}} is used to display well-known protocols in respect to their network layer. Template parameters [Edit template data] This template prefers inline formatting of parameters. Parameter Description Type Status Link layer link Display an extra link layer protocol. Example link=[[TRILL (computing)|TRILL]] String optional Internet layer internet Display an extra ...
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.
As there are only two endpoints on a tunnel, the tunnel is a point-to-point connection and PPP is a natural choice as a data link layer protocol between the virtual network interfaces. PPP can assign IP addresses to these virtual interfaces, and these IP addresses can be used, for example, to route between the networks on both sides of the tunnel.
In computer networks, a tunneling protocol is a communication protocol which allows for the movement of data from one network to another. They can, for example, allow private network communications to be sent across a public network (such as the Internet), or for one network protocol to be carried over an incompatible network, through a process called encapsulation.
PPTP attacks cannot be detected by the client or by the server because the exploit is passive. The failure of PPTP as a VPN protocol is caused by cryptographic design errors in the Cisco LEAP and Microsoft MSCHAP-v2 handshake protocols, and by key length limitations in MPPE. Both LEAP and MSCHAP-v2 derive session keys from user passwords, which ...
PPP Point-to-Point Protocol; PPTP Point-to-Point Tunneling Protocol; PAP Password Authentication Protocol; RPR IEEE 802.17 Resilient Packet Ring; SLIP Serial Line Internet Protocol (obsolete) StarLAN; Space Data Link Protocol, one of the norms for Space Data Link from the Consultative Committee for Space Data Systems; STP Spanning Tree Protocol
In computer networking, Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support virtual private networks (VPNs) or as part of the delivery of services by ISPs. It uses encryption ('hiding') only for its own control messages (using an optional pre-shared secret), and does not provide any encryption or confidentiality of content ...