C
CREATING A VIRTUAL PRIVATE
N
ETWORK (VPN) TUNNEL
This appendix tells you how to create a VPN tunnel from a client workstation,
using the appropriate client software.
Creating a Virtual
Private Network (VPN)
Tunnel
The Dual 56K LAN Modem’s support of the PPTP protocol allows you to establish a
Virtual Private Network tunnel between a workstation attached to the LAN
Modem and a remote private network LAN. In order to establish the tunnel,
however, you must have the appropriate client software installed on your
workstation, and a tunnel server must be in place on the remote LAN. The LAN
Modem cannot initiate or terminate a VPN tunnel.
Since the LAN Modem does not terminate the VPN tunnel, multiple tunnels can be
supported at the same time through a single ISP connection.
Before You Begin Before you can initiate a VPN tunnel to a remote private network, you (or a
network administrator) must already have done the following:
■ On the Remote Private Network (“Server”) Side:
■ Set up a PPTP tunnel server (often called a tunnel “terminator”) on the
remote private network. Examples would be a Windows NT server, version
4.0 or later, with Service Pack 3 or greater and RAS (Remote Access Service)
installed; or 3Com’s NETBuilder, PathBuilder, or Total Control Hub.
■ Installed any networking protocols required for the private network on the
PPTP tunnel server (such as IP, IPX, and NetBeui).
■ On the LAN Modem (“Client”) Side:
■ Configured an Internet Service Provider profile for access to the Internet in
the LAN Modem
■ Installed PPTP tunnel client software on each workstation that will initiate a
VPN tunnel to the private network. Examples of client tunnel software
include:
■ For Windows 95/98: Windows Dial-Up Networking version 1.3 or
higher (these include the required software VPN adapter)
■ For Windows NT/2000: Windows NT Operating System with Service
Pack 3
■ For Macintosh: Network TeleSystem’s TunnelBuilder™ VPN software
■ Installed any network protocols required for the private network on each
workstation that will establish a VPN tunnel.
