1765undo tunnel authenticationView L2TP group viewParameter NoneDescription Use the tunnel authentication command to enable the L2TP tunnelauthentication function.Use the undo tunnel authentication command to disable the L2TP tunnelauthentication function.By default, L2TP tunnel authentication function is enabled.Generally, authentication is required at both ends of a tunnel for the sake ofsecurity. However, you can disable the authentication when you check networkconnectivity or it is required to receive tunneling requests from unknown tunnelpeers.Example # Disable L2TP tunnel authentication. system-view[Sysname] l2tp-group 1[Sysname-l2tp1] undo tunnel authenticationtunnel avp-hiddenSyntax tunnel avp-hiddenundo tunnel avp-hiddenView L2TP group viewParameter NoneDescription Use the tunnel avp-hidden command to specify to transfer attribute value pair(AVP) data in hidden mode.Use the undo tunnel avp-hidden command to restore the default.By default, AVP data is transferred over a tunnel in plain text mode.Note that:■ Some parameters of L2TP are transferred in AVP data. You can use the tunnelavp-hidden command to transfer AVP data in hidden mode for highersecurity.■ The tunnel avp-hidden command is available for only LACs.Example # Transfer AVP data in hidden mode.
