The proliferation of network users, accessibility, flexibility and profitability of Wide Area Network (WAN) / Internet connections have increased the need for affordable and secure communications. Virtual Private Network (VPN) technology has become the technology of choice because of the security levels, it provides for data transmission.

VPNs are primarily the expansion of private networks with links through a joint public telecommunication infrastructure, such as the Internet. In a VPN system data between two computers over the public network to emulate a point-to-point transfer. Data packets are encrypted and decrypted with the topic at the reception. Through encryption and authentication of IP packets over the VPN, the data even if it is intercepted, for hackers to decode without the key impossible. VPN technology in order to maintain the security and privacy by using tunneling protocols and security procedures. In VPN network, LAN, VPN can take different forms through the combination of hardware and software technologies. LAN VPN connection between a remote LAN (LAN) and a private network. VPN systems work in different environments and related technology to make a safe solutions.

The tunneling protocol, also known as encapsulation protocol is a networking technology that includes establishing and maintaining a logical network connection. are the most widely used VPN tunneling protocols Layer Two Tunneling Protocol (L2TP), IP Security (IP Sec), Point-to-Point Tunneling Protocol (PPTP), Secure Sockets Layer / Transport Layer Security (SSL / TS) Open VPN, Layer 2 Tunneling Protocol Version 3 (L2TPv3), VPN quarantine, and Multi-Path (Virtual Private Network MPVPN). The technology supports two types of VPN tunnel – Tunnel voluntary, where the VPN connection instead of the VPN client and compulsory tunneling, if the VPN connection in place is managed by the network operator managed. In tunneling, data packets encapsulated in IP packets and then transmitted over the Internet. After receiving the data to the receiving network end of the packet is encapsulated to be extracted in order to obtain the original message packet from the IP packet.

Trusted VPN and VPN Secure VPN technologies are secure two major VPN and improve. Although use Secure VPN Tunneling cryptographic VPN networks of trust depend solely on the providers of network traffic to only protect the data. VPN trust include Multi-Protocol Label Switching (MPLS) technology to store frequently VPNs with Quality of Service (QoS) will be used by a delivery network of trust, and Layer 2 Tunneling Protocol, which takes on characteristics of the two VPN Protocols owners.

cryptographic tunneling protocols, VPNs are used to secure network privacy through encryption, authentication and integrity of the message. In this advanced technology, there are options to block spying by sniffing packets identity theft and the amendment to block messages. For the implementation and operation of the law securing VPN protocols, it is possible to secure communications over insecure networks and significantly improve the performance of VPN.

The popular VPN tunneling protocols are Internet Protocol Security (IPSec)? Point-to-Point Tunneling Protocol (PPTP), and? Layer 2 Tunneling Protocol (L2TP). Internet Protocol Security (IPSec) protocol is widely used and standardized VPN is most preferred because of the interoperability benefits. IPSec is an open standard secure protocol, following the existing on an IP connection to work, fixed. The VPN protocol operates at Layer 3 of the OSI model. It provides authentication and data encryption and can be implemented using IP on any device. IPSec protects data traffic of IP carried out. There is also the encryption and authentication for non-IP traffic while providing second through the operation of tunneling protocols Layer The three main components of IPSec are integrated: Authentication Header (AH), Encapsulation Security Payload (ESP) and Internet Key Exchange (IKE). The authentication header, which allows for the IP header of the packet-level authentication, and ensure that data packets are not mixed with on the road. ESP provides confidentiality and authentication of data origin.

Point-to-Point Tunneling Protocol (PPTP) is a development from Microsoft that is used in VPN networks and communications. It authenticates users through the authentication protocols (MS-CHAP, CHAP, SPAP, and PAP). Although PPTP is easy to use, it’s still not a solution flexible and non-interoperable protocols such as VPN others. The types of communication are PPTP: PPTP connection (PPP connection to an ISP is set by the client), the control connection (PPTP PPTP server connection created by the user) and PPTP-tunnel data (exchanged communication between client and server in an encrypted tunnel). PPTP is typically used to improve communication channels between Windows hosts numerous to secure the internal network.

The Layer 2 Tunneling Protocol (L2TP) tunnel point-to-Point Protocol (PPP) over a public IP network. It operates at Layer 2, non-IP protocols can be transported through the VPN tunnel and also works on layer-2 components such as ATM, Frame Relay, L2TP encryption and so offer services in conjunction with other protocols or encryption mechanisms .

Technological advances have to seek improvements in their business networks and business communications secure. In line with VPN technology, there is an influx of VPN products to occupy the market. VPN client to compare products based on functionality and flexibility and the best technology. The comparison is also VPN technology and products would incorporate a variety of opportunities to open for selection. It is in accordance with all requirements of customers with the necessary technical equipment for effective use.


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