VPN (Virtual Private Network) - What is VPN?

VPN (Virtual Private Network)

VPN (Virtual Private Network) is a network that is constructed with the help of public medias generally by using internet to connect with the private network such as internal network of the company or organization.

VPN is the network which use public mediums like internet to connect remote office or single user with the help of secure method with the network of organization. VPN provide and ensure the security of data and information of user with the help of security procedures and tunneling protocols like layer 2 tunneling protocol (L2TP). In this process data or information is encrypted at the end of sender and decrypted at destination end.

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A VPN connections which is across the internet is same as the WAN links between different websites. For the user convenience, the network resources which are extended are accessed in the same way as the resources are accessed in private network. But there is a major limitation in traditional VPNs that these VPNs are point-to-point, and they don't support or connect broadcast domains.

VPN which is well designed can provide these benefits to the company

1. Connectivity on extended geographic
2. Operational cost reduces as compare to traditional WANs
3. Transit time and travelling cost reduces for remote users
4. Improvement in productivity
5. Network topology simplifies
6. Opportunities for global networking improve
7. Telecommuter support will be available
8. Faster Return On Investment (ROI) as compare to traditional WAN

Features which are needed in well designed VPN?

1. Security
2. Reliability
3. Scalability
4. Network Management
5. Policy Management
6. Security Mechanisms

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Security Model of VPN provides

1. Data Confidentiality for example if the data is sniffed at the level of packet still then attacker will only see encrypted data.
2. Authentication of sender to prevent the access of unauthorized user access to VPN.
3. Integrity of message to detect any symptoms of data tampering during transmission.

Following things are included in Secure VPN Protocol

1. IPsec (Internet Protocol Security)
2. SSL/ TLS (Transport Layer Security)
3. DTLS (Datagram Transport Layer Security)
4. MPPE (Microsoft Point-to-Point Encryption)
5. SSTP (Microsoft Secure Socket Tunneling Protocol)
6. MPVPN (Multi Path Virtual Private Network)
7. Secure Shell Host VPN