If L2TP tunnel authentication is enabled for L2TP dial-up, what is the default authentication password

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By default, the tunnel authentication password is empty on a router.

For the sake of security, L2TP tunnel authentication is enabled by default. In case of network connectivity test or receiving a connection request sent by an unknown remote end, disable L2TP tunnel authentication. It is recommended that you enable L2TP tunnel authentication.

If a PC initiates L2TP dial-up, you are advised to configure the undo tunnel authentication command on the LNS to disable L2TP tunnel authentication.

Other related questions:
Does an AR enabled with L2TP support RADIUS authentication
The L2TP Access Concentrator (LAC) and L2TP Network Server (LNS) support the RADIUS authentication (remote authentication) function to authenticate remote users. PPP sessions are initiated by user devices and received by the LNS. After being authenticated by the LNS, remote users successfully set up PPP sessions with the LNS and can access resources in the enterprise headquarters. As the other endpoint of an L2TP tunnel, the LNS is a peer device of the LAC, and sets up an L2TP tunnel with the LAC. Additionally, the LNS is the logical termination point of a PPP session; therefore, the PPP client (user device) and the LNS establish a virtual point-to-point link. An LAC provides PPP and L2TP processing capabilities on the packet switched network. The LAC establishes an L2TP connection with the LNS based on the user name or domain name in PPP packets so that PPP frames can be transmitted to the LNS.

Does the AR enabled with L2TP support RADIUS authentication
The LAC and LNS support RADIUS authentication (remote authentication) to authenticate remote users. The LNS terminates PPP sessions. After being authenticated by the LNS, remote users successfully set up PPP sessions with the LNS and can access resources in the enterprise headquarters. For L2TP negotiation, the LNS is the peer device of the LAC, and set up an L2TP tunnel with the LAC. Additionally, the LNS is the logical termination point of a PPP session; therefore, the PPP client (user device) and the LNS establish a virtual point-to-point link. An L2TP Access Concentrator (LAC) provides PPP and L2TP processing capabilities on the packet switched network. The LAC establishes an L2TP connection with the L2TP network server (LNS) based on the user name or domain name in PPP packets so that PPP frames can be transmitted to the LNS.

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