What is a VPN and how does it work

· Category: Networking

What is a VPN and how does it work

What Is a VPN?

A Virtual Private Network (VPN) creates an encrypted tunnel between your device and a remote server. All traffic is routed through this tunnel, hiding your IP address and protecting data from local network snooping.

How It Works

  1. The VPN client authenticates to the server.
  2. A secure tunnel is established using protocols like WireGuard, OpenVPN, or IPSec.
  3. Traffic is encrypted and encapsulated before leaving your device.
  4. The VPN server decrypts traffic and forwards it to the destination.
  5. Return traffic follows the reverse path.

Use Cases

  • Securing traffic on public Wi-Fi.
  • Accessing corporate networks remotely.
  • Bypassing geographic restrictions.
  • Preventing ISP tracking.

Limitations

A VPN does not make you anonymous by default, nor does it protect against malware or phishing. Combine it with other controls such as strong passwords and updated software. For web traffic specifically, what is the difference between HTTP and HTTPS adds another layer of encryption even without a VPN. For DNS configuration, how to configure DNS records is relevant when setting up split tunneling.