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With the Point-to-Point Tunneling Protocol
(PPTP)or Layer Two Tunneling Protocol (L2TP), which are
automatically installed on your computer, you can securely access resources on
a network by connecting to a remote access server through the Internet or other
network. The use of both private and public networks to create a network
connection is called a virtual private network (VPN). The following table
describes the advantages of using VPN connections.
Advantage |
Example |
Cost advantages |
The Internet is used as a
connection instead of a long distance telephone number or 1-800 service.
Because an ISP maintains communications hardware such as modems and ISDN adapters, your network requires less
hardware to purchase and manage. |
Outsourcing dial-up
networks |
You can make a local call to
the telephone company or Internet service provider (ISP), which then connects
you to a remote access server and your corporate network. It is the telephone
company or ISP that manages the modems and telephone lines required for
dial-up access. Because the ISP supports complex communications hardware
configurations, a network administrator is free to centrally manage user
accounts at the remote access server. |
Enhanced security |
The connection over the
Internet is encrypted and secure. New authentication and encryption protocols
are enforced by the remote access server. Sensitive data is hidden from
Internet users, but made securely accessible to appropriate users through a
VPN. |
Network protocol support |
Because the most common
network protocols (including TCP/IP and IPX) are supported, you can remotely run any
application dependent upon these particular network protocols. The IPX/SPX
protocol is not available on Windows XP 64-Bit Edition. |
IP address security |
Because the VPN is encrypted,
the addresses you specify are protected, and the Internet only sees the
external IP address. For organizations with nonconforming internal IP addresses, the repercussions of this are
substantial, as no administrative costs are associated with having to change
IP addresses for remote access via the Internet. |
There are two ways to create a VPN
connection: By dialing an ISP, or by connecting directly to the Internet, as
shown in the following examples.
In the first example, the VPN connection
first makes a call to an ISP. After the connection is established, the
connection then makes another call to the remote access server that establishes
the PPTP or L2TP tunnel. After authentication, you can access the corporate
network, as shown in the following illustration.
In the second example, a user who is already
connected to the Internet uses a VPN connection to dial the number for the
remote access server. Examples of this type of user include a person whose
computer is connected to a local area network, a cable modem user, or a
subscriber of a service such as ADSL, where IP connectivity is established
immediately after the user's computer is turned on. The PPTP or L2TP driver
makes a tunnel through the Internet and connects to the PPTP-enabled or
L2TP-enabled remote access server. After authentication, the user can access
the corporate network, achieving the same functionality as the preceding
example.
Notes
Select “create a new connection”
click next |
select “connect to network at my place” |
select “virtual private network” |
type in any simple name |
select “do not dial the initial connection” |
type in the IP address “207.104.97.98” |
last step .. select “add a shortcut” and click finish |
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