Specifications

130 Chapter 5. Configuring Software Options
Tunnel
Only the L2TP client (soho) will initiate the tunnel and make the connection. The tunnel is routed
through the remote internet which is the default route. The LNS server never calls the L2TP client
(soho).
Figure 1
Note 1: The CHAP secret is ÒclientPasswordÓ.
Note 2: The CHAP secret is ÒtunnelSecretÓ.
Note 3: No CHAP secret is needed; the client does not authenticate the LNS server.
Configuration Process
The following sample scripts list the commands used to configure the routers soho (L2TP client), LNSserver
(LNS), internet, and isp.
¥ Configuration commands for soho (L2TP client)
Note: soho is an ISDN router.
Define soho:
system name soho
system passwd sohopasswd
system msg configured_12/15/98
system securitytimer 60
INTERNET
isp
router
172.16.0.254
internet
router
CO end:
172.16.0.1
L2TP Client:
soho router
LNS:
LNSserver router
(DSL)
192.168.100.1
CompanyRemote User
(ISDN)
TUNNEL
PPP session running over the tunnel
192.168.110.1
LAN:
192.168.100.0
Router on the
LAN side:
192.168.101.1
LAN:
192.168.101.0
CO
LAN
PC
lacclient
(see Note 1)
tunnelAtHome
(see Note 2)
lnsserver
(see Note 3)
tunnelAtWork
(see Note 2)
IP traffic to the Internet IP traffic to the Internet
Frame Relay
ATM traffic