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L2TP Overview
303532-A Rev 00
1-7
Examples of L2TP Networks
Figure 1-1 shows an L2TP network that uses a LAC to connect to the LNS. The
tunnel is between the LAC and the LNS.
Figure 1-1. L2TP Network Using a LAC
Figure 1-2 shows an L2TP network that uses a RAS to connect to the LNS. The
tunnel is between the PC (the L2TP client) and the LNS.
Figure 1-2. L2TP Network Using a RAS
Tunnel
PPP
connection
Remote
host
ISP network
Frame relay
connection
Corporate network
No L2TP
functionality
TMS
Data
LAC
LNS
RADIUS
server
L2T0003A
PC
Tunnel
Remote
host
RAS
ISP network
Frame relay
connection
Corporate network
L2T0004A
L2TP
client
Data
LNS
RADIUS
server
PC