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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 (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).

4. Secure Socket Tunneling Protocol - Wikipedia

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

   The protocol is also used by Windows Azure for Point-to-Site Virtual Network. [5] SSTP is intended only for remote client access, it generally does not support site-to-site VPN tunnels. [6] SSTP suffers from the same performance limitations as any other IP-over-TCP tunnel.

5. Split tunneling - Wikipedia

   en.wikipedia.org/wiki/Split_tunneling

   Split tunneling is a computer networking concept which allows a user to access dissimilar security domains like a public network (e.g., the Internet) and a local area network or wide area network at the same time, using the same or different network connections.

6. Virtual private cloud - Wikipedia

   en.wikipedia.org/wiki/Virtual_private_cloud

   A virtual private cloud (VPC) is an on-demand configurable pool of shared resources allocated within a public cloud environment, providing a certain level of isolation between the different organizations (denoted as users hereafter) using the resources.

7. Locator/Identifier Separation Protocol - Wikipedia

   en.wikipedia.org/wiki/Locator/Identifier...

   Endpoint ID (EID): An EID is an IPv4 or IPv6 address used in the source and destination address fields of the first (most inner) LISP header of a packet. Egress Tunnel Router (ETR) : An ETR is a device that is the tunnel endpoint; it accepts an IP packet where the destination address in the "outer" IP header is one of its own RLOCs.

8. IPsec - Wikipedia

   en.wikipedia.org/wiki/IPsec

   It is then encapsulated into a new IP packet with a new IP header. Tunnel mode is used to create virtual private networks for network-to-network communications (e.g. between routers to link sites), host-to-network communications (e.g. remote user access) and host-to-host communications (e.g. private chat). [32] Tunnel mode supports NAT traversal.

9. Hole punching (networking) - Wikipedia

   en.wikipedia.org/wiki/Hole_punching_(networking)

   When an outbound connection from a private endpoint passes through a firewall, it receives a public endpoint (public IP address and port number), and the firewall translates traffic between them. Until the connection is closed, the client and server communicate through the public endpoint, and the firewall directs traffic appropriately.