HPE FlexNetwork MSR Series Comware 5 Layer 2 - Wan Access Configuration Guide

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L2TP tunnel establishment process
Figure 94 Typical L2TP network
Figure 95 shows an L2TP call's setup procedure in NAS-initiated mode.
Figure 95 L2TP call setup procedure
An L2TP call is set up by using the following procedure:
1. A remote user on Host A places a PPP call.
2. Host A and the LAC (Router A) perform PPP LCP negotiation.
3. The LAC authenticates the remote user by using the PAP, CHAP, or MS-CHAP.
(1) Call setup
(2) PPP LCP setup
(3) PAP or CHAP
authenticaion
(4) Access request
(5) Access accept
(6) Tunnel setup
(7) CHAP authentication
(challenge/response)
(9) User CHAP response,
PPP negotiation parameter
(12) CHAP authentication twice (challenge/response)
(10) Access request
(11) Acesss accept
(13) Access request
(14) Acesss accept
(8) Authentication passes
(15) Authentication passes
LAC
Router A
LNS
Router B
LAC
RADIUS server
LNS
RADIUS server
Remote system
Host A

HPE FlexNetwork MSR Series Specifications

General

Brand	HPE
Model	FlexNetwork MSR Series
Category	Network Router
Language	English