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Intranet-based VPNs

Updated: January 21, 2005

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Intranet-based VPNs

The intranet-based VPN connection takes advantage of IP connectivity on an organization intranet.

Remote access over an intranet

On some organization intranets, the data of a department, such as a human resources department, is so sensitive that the department's network is physically disconnected from the rest of the organization's intranet. While this protects the department's data, it creates information accessibility problems for those users who are not physically connected to the separate network.

With a VPN connection, the department's network is physically connected to the organization intranet but separated by a VPN server. The VPN server does not provide a direct routed connection between the organization intranet and the department's network. Users on the organization intranet with the appropriate user rights can establish a remote access VPN connection with the VPN server and access the protected resources of the sensitive department's network. Additionally, all communication across the VPN connection is encrypted for data confidentiality. For those users who do not have the user rights to establish a VPN connection, the department's network is hidden from view.

The following illustration shows remote access over an intranet.

Remote access over intranet using VPN connection

For more information on deploying remote access VPN connections across an intranet, see Deploying VPNs for Remote Access.

Connecting networks over an intranet

You can also connect two networks over an intranet by using a router-to-router VPN connection. Organizations with departments in separate locations, whose data is highly sensitive, may use a router-to-router VPN connection to communicate with each other.

For example, the finance department might need to communicate with the human resources department to exchange payroll information. The finance department and the human resources department are connected to the common intranet with computers that can act as VPN routers. Once the VPN connection is established, users on computers on either network can exchange sensitive data across the corporate intranet.

The following illustration shows connecting networks over an intranet.

Connecting networks using a VPN connection

For more information on deploying router-to-router VPN connections across an intranet, see Deploying Router-to-Router VPNs.

Note

  • On Windows Server 2003, Web Edition, and Windows Server 2003, Standard Edition, you can create up to 1,000 Point-to-Point Tunneling Protocol (PPTP) ports, and you can create up to 1,000 Layer Two Tunneling Protocol (L2TP) ports. However, Windows Server 2003, Web Edition, can accept only one virtual private network (VPN) connection at a time. Windows Server 2003, Standard Edition, can accept up to 1,000 concurrent VPN connections. If 1,000 VPN clients are connected, further connection attempts are denied until the number of connections falls below 1,000.

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