3com MSR 20-20 참조 매뉴얼

L2TP group view

None

Use the tunnel authentication command to enable the L2TP tunnel 
authentication function.

Use the undo tunnel authentication command to disable the L2TP tunnel 
authentication function.

By default, L2TP tunnel authentication function is enabled.

Generally, authentication is required at both ends of a tunnel for the sake of 
security. However, you can disable the authentication when you check network 
connectivity or it is required to receive tunneling requests from unknown tunnel 
peers.

# Disable L2TP tunnel authentication.

<Sysname> system-view

[Sysname] l2tp-group 1

[Sysname-l2tp1] undo tunnel authentication 

L2TP group view

None

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:

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Some parameters of L2TP are transferred in AVP data. You can use the tunnel 
avp-hidden command to transfer AVP data in hidden mode for higher 
security.

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The tunnel avp-hidden command is available for only LACs.

# Transfer AVP data in hidden mode.