R3166-R3206-HP High-End Firewalls VPN Configuration Guide-6PW101

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Figure 58 Client-initiated tunnel mode
L2TP tunnel establishment process
Figure 59 shows a typical L2TP network.
Figure 59 Typical L2TP network
Figure 60 depicts the setup procedure of an L2TP call in NAS-initiated mode.
IP network
IP network
WANPPPoE/ISDN
Host A
Device A
LAC
Device B
LNS
RADIUS server RADIUS server
Host B
Host C