How Virtual Private Network Works?


When your business matures, the network might spread out from corner to corner in the country and/or across the world. For things to run efficiently, you must need a secure, durable, and fast way of connection to share all the information with people across the computer network. In addition to that, your nomadic employees such as salespeople require an equally durable and secure connection to hook up to their business’s system network from distant and remote locations.

Virtual Private Network (VPN) is one powerful technology to bring about this goal. VPN is the private network that employs the public network (generally the Internet) to join distant users or sites together. It utilizes ‘virtual’ links routed via the Internet from your company’s private network or connection to the distant employees or sites. VPN ensures your business’s security as anyone who captures your encrypted data will be unable to read it.

An archetypal VPN has the central LAN i.e., local-area network at the company’s headquarters, further LANs at distant facilities or offices, and individual mobile users that may connect or join from outside in the fields. VPNs are of two types.


It is also known as VPDN i.e., Virtual Private Dial-up Network. It is the connection from user-to-LAN. This network is used by the organizations that have workers and employees who require joining to the private network from different remote locations. Characteristically, the organization that wants to use a large remote-access network needs to provide Internet dial-up account to its consumers and users who employ an ISP i.e., Internet Service Provider. This is how the telecommuters become able to dial the 1-800 number as to access the Internet and utilize their VPN punter software to have the access to the company’s network. The remote-access VPN allows encrypted and secure connections between the remote users and organization’s private network by means of the third-party service supplier.


The Site-to-Site connections permit branch and division offices to employ the Internet as the channel to access the main company office’s intranet. This connection expands the organization’s network, making the fixed location computer resources, available to workers at other sites. A rising organization with several branch offices needs this VPN connection.


VPN Products

There are certain components need to set up to construct your VPN. These includes:

  1. Desktop software punter for every remote or mobile user
  2. Devoted hardware like VPN Cisco Concentrator or Cisco Secure PIX Firewall
  3. Devoted VPN server for services like dial-up
  4. NAS, i.e., Network Access Server that is employed by service provider for having the access to distant users
  5. Policy managing center and a private network

Because the broadly accepted protocol to implement the VPN is missing, many corporations have built key solution all by themselves. For instance, Cisco provides various VPN solutions including:

VPN Concentrator

Cisco-VPN concentrator is specifically built to create a site-to-site or remote access VPN and preferably arranged where the necessity is the single piece of equipment to hold an outsized number of VPN tunnels. It incorporates the most sophisticated authentication and encryption techniques present at the moment. These concentrators present high scalability, high performance, and availability and involve components, known as SEP i.e., Scalable Encryption Processing modules. It permits users to easily elevate capacity.

VPN-Optimized Router

Every Cisco router that runs Cisco-IOS software holds up IPsec VPNs. The only necessity is that a Cisco IOS image is must run by the router with the suitable feature set. This VPN solution completely supports the distant and remote access, extranet and intranet VPN necessities. It indicates that Cisco router performs just as well whether connected to the VPN device like the router and VPN Concentrator or when attached to the distant host running the VPN Client’s software.

Cisco VPN Clients

Cisco offers software as well as hardware VPN clients. With no extra cost, the software Cisco VPN Client comes along with the 3000 series concentrator of Cisco VPN. This can easily be inserted into the host device and employed to securely connect to the fundamental site concentrator or to any VPN device like firewall or router.

The selection of equipment that you use to put up VPN solution is eventually the design subject that depends on a variety of factors such as the number of clients/users and the preferred throughput.

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