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2. Point-to-Point Tunneling Protocol - Wikipedia

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

   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.

3. Virtual private network - Wikipedia

   en.wikipedia.org/wiki/Virtual_private_network

   Virtual private network. A virtual private network ( VPN) is a mechanism for creating a secure connection between a computing device and a computer network, or between two networks, using an insecure communication medium such as the public Internet.

4. OpenVPN - Wikipedia

   en.wikipedia.org/wiki/OpenVPN

   VPN. License. GNU GPLv2 [10] Website. openvpn .net. OpenVPN is a virtual private network (VPN) system that implements techniques to create secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It implements both client and server applications.

5. VPNBook - Wikipedia

   en.wikipedia.org/wiki/VPNBook

   The service connects to a VPN via OpenVPN client or a PPTP connection. There are minimal variety of geographic locations. Available servers include the United States, Canada and Romania. [2] [3] VPNBook can be used to bypass some governmental restrictions. [4] The service can be connected to by two ways, by connection via a third-party OpenVPN ...

6. Layer 2 Tunneling Protocol - Wikipedia

   en.wikipedia.org/wiki/Layer_2_Tunneling_Protocol

   Layer 2 Tunneling 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 ...

7. VPN blocking - Wikipedia

   en.wikipedia.org/wiki/VPN_blocking

   VPN blocking is a technique used to block the encrypted protocol tunneling communications methods used by virtual private network (VPN) systems. Often used by large organizations such as national governments or corporations, it can act as a tool for computer security or Internet censorship by preventing the use of VPNs to bypass network ...