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

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.

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