VPN+-+How+it+works


 * How VPNs Work**

As been mentioned, basically, a VPN is a private network that uses a public network such as internet to connect to the private site that has been remote by certain organization and users together. Instead of using the leased lines as the connection medium between two nodes, VPN uses virtual connections that been routed through the company or organization that responsible in manage and control the remote site that belong to them.

Figured 1 : Virtual Private Network (VPN) diagram

There are two common types of VPN connectivity method. Firstly is Remote-Access VPN. This method also known as virtual private dial-up network (VPDN). Its functionality is a user-to-LAN connection used by a single organization that needs to connect to the private network various remote locations. Usually, once organizations want to set up the large of remote-access, they will outsource it to an enterprise service provider (ESP). At the ESP, they will set up the network access server which call as NAS and provides the remote users with the desktop client software for their computer. Users then enable to dial a toll-free number to reach the network access server and the connection to the corporate network will establish after that. For example, a company that needs permission in uses the remote-access VPN would be a large firm or organization that has hundreds of staff in the field. Once permission been requested from the organization, remote-access VPN will give the secure permit, encrypted connection between a private network of the company and remote users through a third-party service provider. The advantages using this method is secure, scalable, have an encrypted tunnel across the public network, and user friendly client software. Besides, this method also will reduce the cost by using the toll free number expenditures.
 * Figured 2 : Remote-Access VPN diagram**

Another connectivity method for VPN is site-to-site VPN. An organization enable to make the connection to multiple fixed sites through the public network such as internet by use the dedicated equipment and large scale encryption. This method are separate into 2 types which is Intranet-base which is organization create their own private network in their local area network that is intranet to join in a single private network. This method is applied when the organization has one or more remote locations that they want to join to the private network. Second types of site-to-site VPN are extranet-based. For this types, 1 organization have the close relationship with other organization such as partner, supplier or customer, they built an extranet VPN that connect their LAN to other LAN in other organization. This will allow other organization to join the work shared environment and they don’t need to worry about the security because in this method will provide a user-level of authentication which means just the authorized user will have the permission to join the private network.

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