Step
authentication.
Configuring LCP renegotiation
To establish a NAS-initiated L2TP tunnel, a user first negotiates with the LAC at the start of a PPP
session. If the negotiation succeeds, the LAC initiates an L2TP tunneling request and sends user
information to the LNS. The LNS then authenticates the user according to the proxy authentication
information received.
For the LNS not to accept LCP negotiation parameters, configure this feature to perform a new round
of LCP negotiation between the LNS and the user. In this case, the LNS authenticates the user by
using the authentication method configured on the corresponding VT interface.
If you enable LCP renegotiation but configure no authentication for the corresponding VT interface,
the LNS does not perform an additional authentication for users.
To configure the LNS to perform LCP renegotiation with users:
Step
1.
Enter system view.
2.
Enter L2TP group view in
LNS mode.
3.
Configure
perform LCP renegotiation
with users.
Configuring AAA authentication on an LNS
After you configure AAA authentication on an LNS, the LNS can authenticate the usernames and
passwords of remote access users. If a user passes AAA authentication, the user can communicate
with the LNS to access the private network.
Configure AAA authentication on the LNS in one of the following cases:
•
LCP renegotiation is not configured in NAS-initiated mode.
•
The VT interface is configured with PPP user authentication and LCP renegotiation is
configured in NAS-initiated mode.
•
The VT interface is configured with PPP user authentication in client-initiated mode or
LAC-auto-initiated mode.
LNS side AAA configurations are similar to those on an LAC (see
an
LAC").
Configuring IMSI/SN binding authentication
Configuring IMSI/SN binding authentication on the LNS
Step
1.
Enter system view.
Command
Command
system-view
l2tp-group group-number [ mode
lns ]
the
LNS
to
mandatory-lcp
Command
system-view
"Configuring AAA authentication on
81
Remarks
is not performed on an LNS.
This command is effective only on
NAS-initiated L2TP tunnels.
Remarks
N/A
N/A
By default, an LNS does not
perform LCP renegotiation with
users.
This command is effective only on
NAS-initiated L2TP tunnels.
Remarks
N/A
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