6.4 L2TP/PPTP Explained

Key Concepts

• L2TP (Layer 2 Tunneling Protocol)
• PPTP (Point-to-Point Tunneling Protocol)
• Tunneling
• VPN (Virtual Private Network)
• Configuration and Setup

1. L2TP (Layer 2 Tunneling Protocol)

L2TP is a tunneling protocol used to support VPNs by allowing the secure exchange of data from a remote user to a private network over the internet. L2TP combines the features of two other tunneling protocols: PPTP and L2F (Layer 2 Forwarding). It provides a secure method for encapsulating data and transporting it over an untrusted network.

Example: Think of L2TP as a secure tunnel that allows data to travel safely from one point to another, similar to a secret underground passage that protects valuable items from being intercepted.

2. PPTP (Point-to-Point Tunneling Protocol)

PPTP is an older tunneling protocol used to create VPNs. It allows the encapsulation of Point-to-Point Protocol (PPP) packets within IP packets for transmission over the internet. PPTP is less secure compared to L2TP and is often used for its simplicity and ease of setup.

Example: Consider PPTP as a less secure but quicker route for data transmission, similar to a public road that is faster but not as safe as a private tunnel.

3. Tunneling

Tunneling is a method of transporting data from one network to another by encapsulating the data within another protocol. This allows data to be transmitted securely over an untrusted network, such as the internet. Both L2TP and PPTP use tunneling to create secure VPN connections.

Example: Think of tunneling as a way to send a letter in a sealed envelope within another envelope, ensuring that the contents remain private during transit.

4. VPN (Virtual Private Network)

A VPN is a network that uses a public telecommunication infrastructure, such as the internet, to provide remote users with secure access to their organization's network. VPNs use tunneling protocols like L2TP and PPTP to create secure connections over the internet.

Example: Consider a VPN as a secure bridge that allows remote workers to access their office network from home, similar to a secure bridge that connects two islands.

5. Configuration and Setup

Configuring and setting up L2TP or PPTP on a MikroTik router involves defining the VPN server, setting up user accounts, and configuring the necessary security settings. Proper configuration ensures that the VPN connection is secure and functions correctly.

Example: Think of configuration and setup as assembling a secure door lock. Just as proper assembly ensures the lock functions correctly, proper configuration ensures the VPN connection is secure and reliable.