VPN or Virtual Private Network is one of the best means to protect the personal data on the Internet.
Usually, when you create a VPN, the connection uses Point-to-point to a certain server or the installation of ethernet-tunnel with a certain server, where the tunnel is assigned a specific subnet.
The VPN server at the same time functions as routing and filtering traffic to access the network through the VPN.
VPN consists of two parts: internal and external network.
The external network is encapsulated compound.
In the role of the external network can act as a network of computers or a single use.
Connect remote users to VPN is via an access server, which is connected to both internal and external to the network.
If you are connecting the user with secure network access server requires the passage of the identification process, then the authentication process.
Upon successful completion of all processes, the user is authorized to work in a network, that is, the process of authorization.
Tunneling (encapsulation) - a method of transmitting information through an intermediate network. This information could be packets of another protocol.
When the encapsulation packet is not transmitted to the node in the generated form, and is provided with an additional header with information about the route to pass through an intermediate network.
At the end of the tunnel packets and transmitted to the recipient deinkapsuliruyutsya. This process is called tunneling.
Logical path of movement of the encapsulated packet to the transit network is called a tunnel.
VPN is based on the work of the protocol PPP (Minutes from point to point).
VPN encapsulates the packets IP, IPX and NetBIOS in PPP packets and transmits them through the channel.
The PPP protocol used by routers, dedicated channel, or the client and server RAS, remote connection.
Tunneling - provides a multiplexing transport protocols on a single channel.
PPP LCP sets to install, configure and debug communication channels.
LCP provides a format matching the encapsulation packet size parameters Connect, disconnect and authentication.
As authentication protocols can be used PAP, CHAP, etc.
Network Management Protocol - provide specific configuration parameters for the respective transport protocols.
For example, IPCP control protocol IP.
To install the VPN tunnels using protocols PPTP, L2TP, IPsec, IP-IP.
PPTP - encapsulates IP-, IPX-and NetBEUI-traffic in the IP header for transmission over IP-based networks such as Internet.
L2TP - encrypts and transmits the IP-traffic using any protocol, supporting the regime of PPP.
IPsec - encrypts and encapsulates the information in the headers of the IP protocol for transmission of IP-based networks.
IP-IP - is encapsulated with an additional header IP.
To implement the VPN, in addition to ordinary network devices, you need a gateway, VPN, acting as the formation of tunnels, data protection, logging traffic, as well as the primary control.
At this point VPN - a low-cost, high-quality public and the decision to implement a remote access.
VPN is used to:
1. Private data were not available to third parties.
2. Compress traffic;
3. Hide Real IP-address, to the anonymity of the network intern.
4. Get access to the resources having limits depending on the geo-position.
5. Have a constant - a static IP-address.
6. Get full access to the network-Internet.
VPN in the world
Many international companies use VPN technology to provide their employees access to confidential financial and other information by connecting to the company's computer system from home or other remote connection over the Internet.
To use the VPN service requires installation of special client software.
VPN service provides encrypted data transmission, so this is one of the safest ways to bypass Internet censorship.
Many users use the VPN-connection to their Internet service provider did not keep records of their online activity, in addition to connect time and used the volume of traffic.
As a result, these users maintain their anonymity.
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• From now on, any attacker that connects to your Wi-Fi, or a network administrator does not have access to your private data.
• This is possible due to the strong encryption of your communication channels.