How to Configure a VPN

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How To Configure A VPN
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Virtual Private Networks (VPN) allow users working at
home, on the road or at a branch office to connect in a
secure manner to a remote corporate server using the
public Internet. VPN server or host is a computer that
accepts VPN connections from VPN clients. A VPN server
or host can be a NT/W2K server or W2K/XP Pro. VPN client
is a computer that initiates a VPN connection to a VPN
server or host. A VPN client can be an individual
computer running MS Windows NT version 4.0, Windows
2000, 9x. VPN clients can also be any non-Microsoft Pointto-Point Tunneling Protocol (PPTP) client or Layer Two
Tunneling Protocol (L2TP) client using IPSec.
(1).Basic VPN Requirement

User Permission. Enable a user to access the VPN.
To do this, go to AD Users and Computers, select
the user who need to access the VPN, click Dial-in.
Check Allow access on the Remote Access
Permission (Dial-in or VPN).

IP Configuration. The VPN server should have a
static IP address and assign the arrange IP
addresses to VPN clients. The VPN server must also
be configured with DNS and WINS server addresses
to assign to the VPN client during the connection.

Data Encryption. Data carried on the public
network should be rendered unreadable to
unauthorized clients on the network.

Protocol Support. The TCP/IP is common protocols
used in the public network. The VPN also include IP,
Internetwork Packet Exchange (IPX), NetBEUI and
so on.

Firewall Ports. When you place a VPN server
behind your firewall, be sure to enable IP protocol
47 (GRE) and TCP port 1723.

Interface(s) for VPN server. If your network
doesn't have a router or the VPN is also a gateway,
your computer must have at least two interfaces,
one connecting to the Internet and another
connecting to the LAN. If it is behind a router, you
just need one NIC.

One interface for VPN client. The interface can be
a dial-in modem, or a dedicated connection to the

(2).Configuring VPN in Windows XP Professional

For configuring the VPN connection, you need to
have a static IP address of the remote computer of
your company and the host name. You can
configure the VPN connection in Windows XP
Professional by the following method.

Click Start > Control Panel > Click Network and
Internet connection > Click Network Connections.

Here you need to create new connection and click

Here click “Connect to network at my work place”
click next.

Click “Virtual Private Network” and click next.

Here type the meaningful name for your company
or any other network connection and click next.

Here click “Do not dial the initial connection and
click next.

Here type the hostname and the IP address of the
computer to which you want to connect.

Press next and then press finish.

 (3).Installing VPN in Windows 2000 Professional

Make sure that you are connected to the internet
and you are also connected to the LAN.

Start > Administrative Tools > Routing and
Remote Access.

Click the server name in the tree and on the
action menu click Configure and Enable Routing
and Remote Access and click next.

Click Virtual Private Network (VPN Server) in the
common configurations and click next.

In the remote client protocols, make sure that the
TCP/IP is included in the list. Click yes to all
available protocols and click next.

Select the Internet connection that will connect to
the internet in the internet connection box and
click next.

Select the Internet connection that will connect to
the internet in the internet connection box and
click next.

In the “Managing Multiple Remote Access Server
select this option “No, I don’t want to setup this

server to use Radius Server Now. Click Next > Click
Now right click on the Ports node and click
properties now click WAN mini port (PPTP) and then
click configure.

Type the maximum number of the allowed
simultaneous PPTP VPN connections to this server.

(4).Configuring VPN Server in Windows 2000

You can configure the VPN server further by the
following methods.

Start > Admin Tools > Routing and Remote

Right click the server name and then properties.

Select “Enable this computer as a router” on the
general tab.

Here you have the choice to select Local Area
Routing or LAN or Demand Dial Routing click ok
and close all the dialog boxes.

(5).Configuring VPN Connection in the Client Computer

Start > Settings > Network and dialup connection.

Make new connection.

Click next and then click connect to a private
network through Internet.

Click Automatically Dial this initial connection and
select your dial up internet connection from the

If you use cable modem then select “Do not dial
this initial connection”.

Click next.

Here type the host name and the IP address of the
remote computer to which you want to connect.

Type the descriptive name of the connection and
click next.


If your VPN client cannot find servers or cannot
ping computernmae, you may need to add DNS
and WINS into your VPN server. For example, to
add DNS and WINS on a Cisco Firewall PIX, add
vpdn group 1 client configuation dns
dnsservername and vpdn group 1 client
configuration wins winsservername.

If you have Windows 2003 server as VPN server,
you can assign a static IP under user's properties. If
you use other Windows OS as VPN server, you may
want to create a DHCP reservation.

If you are running w2k/xp pro setup for a domain
controller, you will have a option to "log on using
dial-up connection" on logon screen after creating
a VPN/dial-up connection. In the Log On to
Windows dialog box, the user can select the Log on
using dial-up connection check box. After clicking
OK, the user is prompted to choose a network

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