Virtual Private Network - IP Tunneling and Routing

Description

• A private network constructed on top of a public network, typically the Internet, is called a virtual private network, or VPN. Even though their communication may pass through a public network, computers inside a VPN can connect securely, exactly like if they were on a true private network that is physically isolated from the outside world. With the use of a VPN, staff members may safely access their company's intranet while on the go. Businesses can also use VPNs to extend their private networks domestically and internationally.

• The goal of this lab implementation is to understand how a VPN operates. We concentrate on a particular kind of VPN (the most popular one), which is constructed on top of the transport layer. We are going to construct a basic VPN from the ground up.

Lab topics covered

• Network Setup.
• Create and Configure TUN Interface
  2.a: Name of the Interface
  2.b: Set up the TUN Interface
  2.c: Read from the TUN Interface
  2.d: Write to the TUN Interface
  
• Send the IP Packet to VPN Server Through a Tunnel

Shell scripts commands

• ./dc-build.sh - Build the docker images, it can take one additional parameter to be used in the build process.
• ./dc-up.sh - Start the docker containers in the foreground.
• ./dc-up-d.sh - Start the docker containers in the background.
• ./dc-stop.sh - Stop the docker containers, it can take one additional parameter to be used in the stop process.
• ./dc-down.sh - Stop and remove the docker containers, it can take one additional parameter to be used in the stop and remove process.
• ./dc-unittest.sh - Utility script to aid in running a specific unit test class.

Program walk-through:

This lab provides hands-on experience with the foundational concepts of VPNs, including TUN/TAP interfaces, tunneling, and routing. By implementing both unidirectional and bidirectional tunnels,

• Virtual Private Network:
  

  • The TUN/TAP virtual interface
  • IP tunneling
  • Routing