Virtual private network (VPN)

extendingyournetwork networksecurityprotocols introductiontonetworking

A virtual private network (VPN) is a technology allowing two or more computers on different networks to communicate securely as if they were on the same network segment.

Common use cases are:

  • 🐦 to by-pass (country/...) restrictions and access some websites
  • 🎠 to access a company internal network
  • 🌍 to create a common network between companies
  • ...

There are 3 categories of VPNs:

  • Remote access: connect to a remote location (see also: Split-Tunnel)
  • Site-to-Site: connect geographically separated networks
  • SSL: use SSL/TLS, usually used in web browsers

VPN can be implemented using

  • Point-to-Point Tunneling Protocol (PPTP): an implementation based on PPP, allowing traffic to leave the network. It's considered as less-secure and more vulnerable than others.
  • Layer 2 Tunneling Protocol (L2TP): implementation based on PPP used with IPSec for tunneling
  • OpenVPN: usually a server generates a configuration that clients use to authenticate themselves and access the VPN network
$ sudo apt install openvpn # install
$ sudo openvpn user_config.ovpn # connect 
  • ...

πŸ‘» To-do πŸ‘»

Stuff that I found, but never read/used yet.

  • L2TP/IPsec
  • SSTP
  • SoftEther