L2TP

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L2TP

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L2TP

(Layer 2Tunneling Protocol) An IETF protocol that lets remote users access the corporate network. The PPP protocol encapsulates IP packets from the user's devices to the ISP, and L2TP extends that session across the Internet. L2TP was derived from Microsoft's Point-to-Point Tunneling Protocol (PPTP) and Cisco's Layer 2 Forwarding (L2F) technology. See PPP, PPTP and L2F.

L2TP/IPsec
L2TP does not include encryption but is often used with IPsec in order to provide virtual private network (VPN) connections. See VPN and VPN protocols.


PPP and L2TP Traffic
The NAS is the control point for remote users. The LAC encapsulates PPP frames with L2TP headers and sends them out as UDP packets. At the other end, the LNS terminates the PPP session and hands the IP packets to the LAN. L2TP can also be run in the user's PC.
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It has also been extended to support key OpenFlow 1.5 features such as the highly anticipated Copy-Fields action, as well as other new features that significantly boost the performance of OpenFlow based applications, such as a hashing function on user-defined ordered lists, MPLS payload matching and broader encapsulation/decapsulation support for layer 2 tunneling protocols.