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624 CHAPTER 43: CONFIGURING L2TP
Figure 190 Connect to “Connection to 66046”
To determine the IP address assigned to your computer by the LNS, use the
DOS-based command ipconfig.
Client-originated VPN
Networking
I. Networking requirements
After connecting to the Internet, the VPN user originates request for connecting
Tunnel. At receiving the request, LNS establishes a Tunnel with the VPN, so as to
transmit data between the user and the company headquarters.
LAC (NAS) and LNS are connected to a 3Com router. They connect to the Internet
through serial interfaces and transmit data through Tunnel. The PC named
win2000 in installed with Windows2000. The Async2 interface and the PC are
connected to a Modem, and the number are 660046 and 600040 separately.
II. Networking diagram
Figure 191 Networking diagram of client-originated VPN
III. Configuration procedure
1 Configuration at the LAC (NAS) side
a Configure the username and password (when dialing up in Windows2000)
[Router-LAC] local-user lac service-type ppp password simple lac
b Configure address pool, and assign Internet address for the user.
[Router-LAC] ip pool 1 192.170.0.3 192.170.0.100
Internet
PSTN
Company
headquarters
LNS
Router
LAC
NAS
VPN
user
Tunnel
Internet
PSTN
Company
headquarters
LNS
Router
LAC
NAS
VPN
user
Tunnel