A VPN is defined as a virtual tunnel, it comes from the acronym for "Virtual Private Network". This extends a private network through a public network such as the Internet. The VPN allows a network-enabled device or computer to send and receive data across different shared or public networks as if it was connected directly to the private network, while benefiting from the policies of functionality, security and public network management device. A VPN is created by establishing a virtual point to point connection by using certain connections known as virtual tunnel protocols or traffic encryption. The main VPN implementations include OpenVPN and IPsec.

When a VPN connection is set through the Internet there is a similarity between a web link of wide area (WAN call) between web pages. If we consider the user's point of view, it can be said that access to resources of the extended network is possible because it works as if the resources were available within the private network. One of the main limitations of common VPNs is that they are "point to point", and they do not tend to connect or support broadcast domains. Therefore communication, software and websites, which are based on layer 2 (or the data link layer) and the information packets like NetBIOS networks commonly used in Windows, may not be fully compatible or may not work exactly as they should do in a LAN connection. There are also some VPN variants, such as LAN and Virtual Private service (called VPLS), and layer two tunneling protocols, are created to overcome this problem.

If We consider this from the corporate standpoint, VPNs allow employees to securely access the company intranet while they are not at work yet, for example in a business trip. Similarly, the VPN can safely connect offices that are geographically separated creating a coherent network. The VPN technology is also used by individual users to secure their wireless transactions to circumvent the restrictions of a country and/or censorship, and it is even used to make connections to a proxy server and thus to ensure a protected personal identity and location.

Therefore, VPNs aim to create a tunnel on the Internet and thereby protect the information sent from the transmitter to the receiver through security services that in most of the cases are encrypted and are also im charge of authenticating the information. To foster a successful authentication there must be structures of confidentiality and integrity which are secured by the use of other technology such as IPv4, IPv6 or IPSec in virtual private networks. It means that it is not enough to use only one VPN as the information could be exposed to be intercepted and altered; for that reason, the user can be exposed. But with this service users get a wide benefit because they retain the integrity of data traveling over the Internet at an affordable price.

The advantage of this service is that it is the access comes from the Internet where it is possible to log in a private network from any remote location, creating tunnels on the Internet to protect the information while encrypting through a security protocol for the information not to be easily interpreted by third parties that wouold like to access the information without authorization.

VPN and Security

A VPN is designed to provide a secure, encrypted tunnel that allows the transmission of data between the remote user and the corporate network, to name one example. Information transmitted between the two clients through the encrypted tunnel can not be accessed by anyone else, because the system contains several elements that guarrante the security in the private corporate network and the external network with which the remote user is connected.

The first step to ensure the security is usually the implementation of a server to secure the connection between the client and the host server; this allows the remote user to establish an authenticated connection firewall. On the other hand, encryption is also important to have a secure VPN component. Encryption works by having all data sent from a encrypted computer so that the computer is the only one that that sends the data to be decrypted.

Therefore, for an optimal VNP creation it is important to have a combination of three vital technological structures which are a security architecture, a traffic controler and a structure of business management.

The first structure, namely the safety structure excels access control as this ensures the security of network connections, this is also a structure of encryption that takes the role of "safe-deposit box" which means that it keeps the data as private. Finally you need an authentication mechanism to certify which users are allowed to access the network and maintain an integral information. The second structure, the Traffic Control refers to a control component too but in this case it is in chargo of providing solid data traffic and quality of speed, which means that tit is in charge of avoiding system glitches or slowl speed of traffic. The final structure is a VPN business management that offers support and generates the required corporate security policies, such as technology upgrades to be at the forefront of service.

In short, the primary purpose of a VPN is to provide a connection to a remote user so that s/he can enjoy it as much as its private network, and also that the user can feel the extra benefits it offers, such as anonymity, no matter all the actions performed in a public network. To fully carry out this task, it is necessary to combine different processes and guarantee the information protection while using the VPN.

VPN Consumer Services

People that use a private VPN service, also known as a VPN tunnel, look for protecting their personal activities and/or online identity. Using an anonymous VPN service, the Internet traffic and data of a user remain encrypted, which prevents that snoopers pry the Internet activity. A VPN service is especially useful at the time of using public hotspots for Wi-Fi because the public wireless services tend to be unsafe, it is very common if you have a tablet or a smartphone you use this free internet service especially abroad, and if a hacker is in the web then he could have access the online account of your bank it would be very unpleasant. In addition to public safety in connection with a free Wi-Fi, private VPN service also offers consumers access to uncensored Internet content and it can help to prevent data theft and blocked websites.

VPN in for Corporate Communications

Companies and organizations use VPN to communicate confidentially over a public network and to send voice, video or data. It is also an excellent choice for workers and organizations with global offices and partners located at a distance for sharing data privately.

One of the most common types of VPN that companies use is called a virtual private network dial (VPDN). A VPDN is a user-to-LAN conexion that remote users need to connect to the corporate LAN. Another type of VPN is commonly called a site-to-site VPN. Here the company must buy a special oriented hardware to connect multiple sites to the corporate LAN through a public network, usually the Internet.

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