Thursday, June 2, 2011

Low Cost VPN or Virtual Private Networks

Until not long ago, the different branches of a company could have, each, a LAN to the branch that operates in isolation from the others. Each of these local networks had their own naming scheme, its own email system, and even using protocols that differ from those used in other branches. That is, in every place there was an entirely local settings, which should not necessarily be compatible with any or all other configurations of the other areas within the same company.

As the computer was being built for businesses, the need arose to communicate the different local networks to share internal company resources. To meet this objective, there was the need of a physical medium for communication and this medium were the telephone lines, with the advantages of very high availability ensuring privacy.

In addition to communication between different branches, it became necessary to provide access to mobile users in the enterprise. Through Remote Access Services (RAS), such user can connect to the corporate network and use the resources available within it.

The major drawback of using telephone lines is their high cost, since they usually charge a monthly fee plus a usage fee, which takes into account the duration of calls and the distance to where they are made. If the company has branches within the same country but in different area codes, and also has branches in other countries, telephone costs can become prohibitive. Additionally, if mobile users must connect to the corporate network and not within the area of the company, must make long distance calls, which increased costs.

The Virtual Private Networks (VPNs) are an alternative to WAN via telephone lines and the RAS service, lowering costs and providing the same services using authentication, encryption and the use of tunnels for connections.

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