What is L2TP (Layer 2 Tunneling Protocol)?


The L2TP layer 2 tunneling protocol is one of the crucial widespread choices for seamless entry to numerous Internet websites. The primary precept of its operation is to create a dependable connection between the patron and the VPN server.

Due to the dearth of encryption and privateness, the layer 2 protocol is often mixed with the IPsec protocol, which ends up in end-to-end L2TP packet encryption and information management within the tunnel. The confidentiality of transmitted data is assured.

Encryption of this format is completely protected. However, this is a slower resolution than utilizing the OpenVPN software program. Traffic is transformed to L2TP and encoded utilizing IPsec. This is a two-step course of that leads to a discount in pace.

Features of use

Purposes of utilizing L2TP:

  • helps VPN service ;
  • use by an ISP to encapsulate buyer information into its IP community;
  • an area hub within the circuit doesn’t suggest worldwide expenses;
  • utilized by purchasers to hook up with a distant LAN server from wherever;
  • helps to make use of community connections in order that endpoints may be on completely different machines.

L2TP is used because the configuration protocol for VPN companies.

Work ideas

In order to know what PPTP and L2TP are, one ought to make clear the nuances of their functioning.

As a normal, the Layer 2 Tunneling Protocol is a set of procedures that govern digital communication processes. It was first proposed in 2000. If you wish to perceive how the L2TP protocol works, you must keep in mind that it is based mostly on two older tunneling protocols:

  1. Layer 2 forwarding protocol from Cisco
  2. The outdated and insecure PPTP from Microsoft.

If you have an interest in understanding what the L2TP protocol is, then this is an prolonged model of PPTP, and suppliers use it to attach non-public digital networks. This strategy ensures the security of knowledge whereas passing by the tunnel utilizing encryption.

It consists of two major parts:

  • Access Concentrator – the system that terminates the decision;
  • LNS Network Server A community server is a tool that defines and terminates PPTP.

The process permits you to run protocols on networks that can’t assist them or securely switch non-public data. This turns into attainable as a result of the info of the previous is packed in a approach handy for the latter. L2TP handles the tunneling half.

In the course of labor, completely different tunnels may be concerned. By comparability, PPTP can solely be used over IP networks.

L2TP between two factors with completely different QoS can assist a couple of tunnel.

Benefits of the L2TP protocol

Layer 2 tunneling has its strengths.

The 12TP protocol is versatile, light-weight, and shortly customizable. It may be tailored to any encryption technique.

  1. It is widespread, so it is fairly simple to implement. Supported by most working methods.
  2. It makes use of a high-quality and safe encryption algorithm AES-256.
  3. Compresses headers to a dimension of 4 bytes.

L2TP Disadvantages

You also needs to pay attention to the vulnerabilities of this model:

  • port 500 utilized by the protocol may be blocked;
  • because of the double encapsulation of consumer information, it hides or restricts direct entry to them, which limits the pace of labor;
  • is not at all times capable of assist keep away from community restrictions.
  • on account of safety inconsistencies, low speeds, restricted port assist, and interruptions in information switch could happen.

Despite the presence of sure disadvantages, there are way more facilities and benefits for customers.