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JunosE 11.2.x Broadband Access Configuration Guide
L2TP Dial-Out Platform Considerations
L2TP Dial-Out References
Before You Configure L2TP Dial-Out
408
Mutual Authentication
Mutual authentication takes place in LCP, where the LNS validates the PPP interface on
the remote CPE and vice-versa. LNS takes the same actions to authenticate the peer as
it does on incoming calls.
The LNS obtains the PPP username and password from the initial Access-Accept
message. It then provides this information to the remote CPE for authentication.
Route Installation
Once authentication is complete, the router creates a new access route. This route directs
the forwarding of IP packets related to the original trigger packet to the newly created
interface. The route does not need to be identical to the one specified in the dial-out
route, but it must be able to forward packets that have the same destination address as
the trigger packet. However, if the access route does not encompass the dial-out route
definition, any other trigger packets initiate a new dial-out session.
The dial-out state machine verifies that the trigger packet can be forwarded over the
route.
If the verification is unsuccessful, the dial-out session is put into the failed state.
If the verification is successful, the dial-out session is put into the inService state.
L2TP dial-out is supported on all E Series routers.
For information about the modules supported on E Series routers:
See the ERX Module Guide for modules supported on ERX7xx models, ERX14xx models,
and the ERX310 Broadband Services Router.
See the E120 and E320 Module Guide for modules supported on the E120 and E320
Broadband Services Routers.
For more information about L2TP, see RFC 2661—Layer Two Tunneling Protocol " L2TP"
(August 1999).
Create a profile that the router uses to create the dynamic PPP and IP interfaces on the
LNS. The profile specifies parameters that are common to all dial-out sessions that use
the profile. The following is an example of a typical profile configuration.
Create a profile.
1.
host1(config)#profile dialOut
host1(config-profile)#
Copyright © 2010, Juniper Networks, Inc.
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Troubleshooting
