TUTORIAL

VIRTUAL PRIVATE NETWORKS

Traditionally, multiple site organizations that want to communicate with each other have connected via leased-line or ISDN dial-up from each remote site - both of them can be expensive options, especially where there are many locations. More and more organizations are setting up Virtual Private Networks, which enable communication across the very cheap public net-work that is the Internet.

A Virtual Private Network is a private network that is configured within a public network. These have been around for years, built over public networks like BT, for private customer networks, but today there is tremendous interest in VPNs over the Internet. With the right hardware & software, secure communication becomes possible and additional benefits of simple set up, reduced cost and easy administration are making VPNs the 1st choice for wide area connectivity.

VIRTUAL PRIVATE NETWORKS - USES

These include:
Remote Access - remote or mobile users can now connect via VPN client software to the company network. This eliminates the high costs of long distance access calls and the internal modem banks necessary to receive them. The savings can be significant.

Intranet - Main and branch office locations can use always on connections to the Internet, through the establishment of secure 'tunnells'. Because this type of connection is fast and easy to establish, Intranet VPNs make it easy and affordable to provide all employees with full access to the company network, regardless of the size, number or location of its remote offices

Extranet - Connect a company with its customers, suppliers, and other business partners, providing them with limited access to specific portions of the company network for purposes of collaboration and coordination. Access methods may include both dial up and persistent connections, but all access is subject to rigorous user identification and authorization controls. A major appeal of extranet VPNs is the ease and speed with which secure communications can be extended to new partners, even for temporary, per-project alliances.

VIRTUAL PRIVATE NETWORKS - HOW IT WORKS
VPN networks are built around secure tunnels, established over the Internet between VPN devices. To secure a tunneled transmission against interception and tampering, all traffic over a VPN is typically encrypted for safety.

IP SECurity is the security protocol that provides authentication and encryption over the VPN tunnels. Designed for the IP protocol, it has wide industry support and is the standard for VPNs on the Internet.

VIRTUAL PRIVATE NETWORKS - BENEFITS

• Provides home, mobile and branch offices connectivity to main office LAN
• Reduced set-up cost, compared to traditional Wide Area Networks
• Low cost of ownership, including fast reconfiguration
• Simple set-up & easy to administer
• Global connectivity

Further Details
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