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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References in periodicals archive ?
The method uses an IP/UDP header compression protocol, PPPMux multiplexing and L2TP tunneling in order to work end-to-end.
It's worth noting that the next level of security standards will likely combine the robustness of L2TP within the security of IPSec.
L2TP and IPSec with high performance embedded DES and DES/3DES encryption capability ensures data security over both public and private networks and the ability to quickly establish connections with new users.
Supported protocols include IPSec, IPPCP, PPTP, L2TP, PPP, and IKE.
Three popular tunneling protocols have emerged: Microsoft's point-to-point tunneling protocol (PPTP), the Layer 2 tunneling protocol (L2TP), and the IP security protocol (IPSec) which is backed by the Internet Engineering Task Force (IETF).
According to the company, the new software has been launched to eliminate the need to lease communications lines by allowing customers to use the L2TP protocol to send non-IP traffic via theInternet.
Vendors of RAS systems implemented PPTP (point-to-point tunneling protocol) well before router vendors advanced the technology to its new standard, L2TP (Layer 2 Tunneling Protocol).
Cisco Systems have launched solutions to allow service providers to deliver Access VPNs, Intranet VPNs and Extranet VPNs and also released the Layer 2 Tunneling Protocol (L2TP) within Cisco's IOS software.
L2TP supports multiple, simultaneous tunnels for a single client and provides better user authentication.