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  2. Point-to-Point Tunneling Protocol - Wikipedia

    en.wikipedia.org/wiki/Point-to-Point_Tunneling...

    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 GRE tunnel to the same peer. The PPTP GRE packet format is non standard, including a new acknowledgement number field replacing the typical routing field in the GRE header. However, as in a normal GRE connection ...

  3. Secure Socket Tunneling Protocol - Wikipedia

    en.wikipedia.org/wiki/Secure_Socket_Tunneling...

    The use of SSL/TLS over TCP port 443 (by default; port can be changed) allows SSTP to pass through virtually all firewalls and proxy servers except for authenticated web proxies. [1] SSTP servers must be authenticated during the SSL/TLS phase. SSTP clients can optionally be authenticated during the SSL/TLS phase and must be authenticated in the ...

  4. Point-to-Point Protocol - Wikipedia

    en.wikipedia.org/wiki/Point-to-Point_Protocol

    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 ]

  5. Generic routing encapsulation - Wikipedia

    en.wikipedia.org/wiki/Generic_Routing_Encapsulation

    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.

  6. Virtual private network - Wikipedia

    en.wikipedia.org/wiki/Virtual_private_network

    Virtual private network (VPN) is a network architecture for virtually extending a private network (i.e. any computer network which is not the public Internet) across one or multiple other networks which are either untrusted (as they are not controlled by the entity aiming to implement the VPN) or need to be isolated (thus making the lower network invisible or not directly usable).

  7. Microsoft Point-to-Point Encryption - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Point-to-Point...

    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.

  8. VPN blocking - Wikipedia

    en.wikipedia.org/wiki/VPN_blocking

    Ports that are used by common VPN tunneling protocols, such as PPTP or L2TP, to establish their connections and transfer data can be closed by system administrators to prevent their use on certain networks. Similarly, a service can prohibit access by blocking access from IP addresses and IP address ranges that are known to belong to VPN providers.

  9. Tunneling protocol - Wikipedia

    en.wikipedia.org/wiki/Tunneling_protocol

    Tunneling a TCP-encapsulating payload (such as PPP) over a TCP-based connection (such as SSH's port forwarding) is known as "TCP-over-TCP", and doing so can induce a dramatic loss in transmission performance — known as the TCP meltdown problem [6] [7] which is why virtual private network (VPN) software may instead use a protocol simpler than ...

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