What is a VPN? Know the VPN Principles & How it Works

What is a VPN? Maybe this question arises when you’ve just heard of a VPN. To explain what is VPN and the working principle of VPN, please refer to the following article:

VPN ( Virtual Private Network ) is a private connection through the public network (in this case the internet). Here are two words that we can underline that is:

  • Virtual network, which means that the network is only virtual. There is no real network connection between the 2 points that will be related.
  • Private, a network that is formed private where not everyone can access it. The data that is transmitted is encrypted so that it remains confidential even through the public network.

With this VPN we seem to create a network within the network or commonly called tunnel (tunnel). Tunneling is a way of creating private lines using third-party infrastructure. VPN uses one of three existing tunneling technologies: PPTP, L2TP, and the latest standards, Internet Protocol Security (commonly abbreviated as IPSec). VPN is a combination of tunneling and encryption technology.

Below is an overview of VPN connections that use the PPTP protocol. PPTP (Pont to Point Tunneling Protocol) is a protocol that allows the Point-to-Point Protocol (PPP) relationship over IP networks, by creating a Virtual Private Network (VPN).


How VPN Works

From the above picture in a simple way the work of VPN (with PPTP protocol) is as follows:

  • VPN requires a server that serves as a link between PCs, this VPN Server can be a computer with a VPN Server application or a Router, for example, MikroTik RB 750.
  • To start a connection, the computer with the VPN Client application contacts the VPN Server, the VPN Server then verifies the username and password and if successful then the VPN Server assigns a new IP Address to the client computer and then a connection/tunnel will be established.
    For the next client computer can be used to access various resources (computer or LAN) located behind the
  • VPN Server such as data transfer, print document, browsing with gateway provided from the VPN Server, remote desktop and so forth.


Benefits or Benefits of VPN


Some of the advantages of VPN technology include:

  • Remote Access, with the VPN we can access the computer or office network, from anywhere as long as connected to the internet
  • Security, with VPN connection we can surf safely when using public internet access such as hotspot or internet cafe.
  • Save on network setup costs, VPNs can be used as an alternative technology to connect large local networks for a relatively small cost, because data transmission of VPN technology uses existing public network media without the need to build a private network.
  • And others that I do not understand yet


Disadvantages or weaknesses of VPNs


Any advantages there are disadvantages, some of the shortcomings of the VPN are:

  • Internet connection (public network) that we can not predict. This we can understand because basically we just “nebeng” connection on the other party network so we automatically have no control over the network.
  • More attention to security. Again due to the use of public networks, we need to pay more attention to preventing unwanted things such as tapping, hacking and cybercrime actions on VPN networks.
  • And others that I do not understand yet