Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Navigation
Guide That Contains This Content
[+] Expand All
[-] Collapse All
     

    Related Documentation

     

    L2TP Terminology

    Table 1 describes the basic terms for L2TP.

    Table 1: L2TP Terms

    Term

    Description

    Attribute value pair (AVP)

    Combination of a unique attribute—represented by an integer—and a value containing the actual value identified by the attribute.

    LAC

    L2TP access concentrator (LAC)—a node that acts as one side of an L2TP tunnel endpoint and is a peer to the LNS. An LAC sits between an LNS and a remote system and forwards packets to and from each.

    Call

    A connection (or attempted connection) between a remote system and an LAC.

    LNS

    L2TP network server (LNS)—a node that acts as one side of an L2TP tunnel endpoint and is a peer to the LAC. An LNS is the logical termination point of a PPP connection that is being tunneled from the remote system by the LAC.

    Peer

    In the L2TP context, refers to either the LAC or LNS. An LAC’s peer is an LNS, and vice versa.

    Proxy authentication

    Authentication data from the PPP client that is sent from the LNS as part of a proxy LCP. Data might include attributes such as authentication type, authentication name, and authentication challenge.

    Proxy LCP

    LCP (Link Control Protocol) negotiation that is performed by the LAC on behalf of the LNS. Proxy sent by the LAC to the LNS containing attributes such as the last configuration attributes sent and received from the client.

    Remote system

    An end-system or router attached to a remote access network, which is either the initiator or recipient of a call.

    Session

    A logical connection created between the LAC and the LNS when an end-to-end PPP connection is established between a remote system and the LNS.

    NOTE: There is a one-to-one relationship between established L2TP sessions and their associated PPP connections.

    Tunnel

    A connection between an LAC-LNS pair consisting of a control connection and 0 or more L2TP sessions.

     

    Related Documentation

     

    Published: 2014-08-20