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Published in August 1999 as proposed standard RFC 2661, L2TP has its origins primarily in two older tunneling protocols for point-to-point communication: Cisco's Layer 2 Forwarding Protocol (L2F) and Microsoft's [2] Point-to-Point Tunneling Protocol (PPTP).
The Point-to-Point Protocol over Ethernet (PPPoE) is a network protocol for encapsulating Point-to-Point Protocol (PPP) frames inside Ethernet frames. It appeared in 1999, in the context of the boom of DSL as the solution for tunneling packets over the DSL connection to the ISP's IP network, and from there to the rest of the Internet.
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.
Some of them, like SSL, SSH, or L2TP create virtual network interfaces and give the impression of direct physical connections between the tunnel endpoints. On a Linux host for example, these interfaces would be called tun0 or ppp0 .
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.
When a user uses L2TP/IPsec or MS-SSTP VPN to connect to the VPN Server, the built-in VPN client programs on the operating system can be used to establish a VPN to the VPN Server. However, SoftEther VPN Client has advanced functions (e.g. more detailed VPN communication settings) than OS built-in VPN clients.
Layer 2 Tunneling Protocol version 3 is an IETF standard related to L2TP that can be used as an alternative protocol to Multiprotocol Label Switching (MPLS) for encapsulation of multiprotocol Layer 2 communications traffic over IP networks. [1] Like L2TP, L2TPv3 provides a pseudo-wire service, but scaled to fit carrier requirements.
L2TP Layer Two Tunneling Protocol Version 3: RFC 3931: 0x74 116 DDX D-II Data Exchange (DDX) 0x75 117 IATP Interactive Agent Transfer Protocol: 0x76 118 STP Schedule Transfer Protocol: 0x77 119 SRP SpectraLink Radio Protocol: 0x78 120 UTI Universal Transport Interface Protocol 0x79 121 SMP Simple Message Protocol: 0x7A 122 SM Simple Multicast ...