RFC Layer Two Tunneling Protocol “L2TP” (Q). request for comments publication. RFC; Layer Two Tunneling Protocol. Layer Two Tunneling Protocol “L2TP”, August Canonical URL: https://www. ; File formats: Plain Text PDF; Status: PROPOSED. In computer networking, Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to Published in as proposed standard RFC , L2TP has its origins primarily in two older tunneling protocols for point-to-point communication.

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Internet protocols Internet Standards Tunneling protocols Virtual private networks. With L2TP, a user has an L2 connection to an access concentrator e. L2TP allows the creation of a virtual private dialup network VPDN [5] to connect a remote client to its corporate network by using a shared infrastructure, which could be the Internet or a service provider’s network.

The value 1 is reserved to permit detection gfc L2F packets should they arrive intermixed with L2TP packets. LCP echo requests used as a keepalive for the link, for instance, should generally be sent with this bit set.

Layer 2 Tunneling Protocol

Because of the lack of confidentiality inherent in the L2TP protocol, it is often implemented along with 22661. Once a tunnel is established, the network traffic between the peers is bidirectional.


If the length is set to 6, then the AVP Value field is absent. Session ID in each message is that of the intended recipient, not the sender. At the time of setup of L2TP connection, many control packets are exchanged between server and client to establish tunnel and session for each direction.

Rather, it relies on an encryption protocol that it passes within the tunnel to provide privacy. The number of bytes contained in this AVP. IPsec is often used to secure L2TP packets by providing confidentiality, authentication and integrity.

If set, the Ns and Nr fields are present. PPP defines an encapsulation mechanism for transporting multiprotocol packets across layer 2 L2 point-to-point links. From Wikipedia, the free encyclopedia.

This field exists if the O bit is set. The LNS waits for new tunnels. This page was last edited on 3 Octoberat That is, the same tunnel will be given different Tunnel IDs by each end of the tunnel. That is, the same session will be given different Session IDs by each end of the session. Reliability, if rrfc, must be provided by the nested rfv running within each session of the L2TP tunnel.

Views Read Edit View history. It may tunnel any protocol carried within PPP.

Level 2 tunneling protocols have seen wide use in ltp small and large networks. If the offset field is present, the L2TP header ends after the last byte of the offset padding.


Indicates the identifier for a session within a tunnel. In such a configuration, the L2 termination point and PPP session endpoint reside on the same physical device i. The control message must then continue to be processed as if the AVP had not been present. ATM access network extensions. 26611 set, the Offset Size field is present. The traffic for each session is isolated by L2TP, so it is possible to set up multiple virtual networks across a single tunnel.

Information on RFC ยป RFC Editor

One peer requests the other tfc to assign a specific tunnel and session id through these control packets. Total length of the message in bytes. Nr, sequence number expected. A secure channel refers to a connection within which the confidentiality of all data is guaranteed. Specifies the number of bytes past the L2TP header at which the payload data is expected to start. It does not provide any encryption or confidentiality by itself.