L2TP protocol

Posted on 2002-05-15
Last Modified: 2012-06-27
What is L2TP protocol ?
When do we use , and for what ?
Is it the CISCO proprietary ?
Is it the Protocol for VPN session ??

thanks in advances.
Question by:leumas
  • 3
  • 2

Accepted Solution

cincin77 earned 50 total points
ID: 7013350
L2TP is a tunneling protocol.
It is not Cisco proprietary.
It is a protocol used in one type of the VPNs; layer 2 VPNs.

Let me explain:
When you connect to the internet and connect to a host in the internet, you go through several ISPs so several routers, switches etc. Another way to connect to that machine is a through a modem connection. Your modem calls a modem connected to your target machine.

Tunneling in the internet emulates this modem connection. Although you go through several intermediate machines in order to reach your target machine in the inernet, if you use a layer 2 tunneling protocol like L2TP, you feel like you are directly connected to your target.

L2TP creates a new packet which includes your original packet(so for example if you are part of a network in which private IPs are used, you are connceted to the target with this 'non-routable in the internet' IP address.). As this is a layer 2 tuneling protocol, you are like in that target LAN.


Author Comment

ID: 7013365
So L2TP looks like IPSEC ?? Is that right ?

Expert Comment

ID: 7013371
IPSEC is a tunneling protocol in layer 3.
You cannot carry anything but IP over IPSEC. With L2TP os a nother tunneling protocol in layer 2 you can carry IP, Netbios, IPX ....

Author Comment

ID: 7276505
Thanks so much cincin

Author Comment

ID: 7276533
Thanks sir.

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this tutorial I will show you with short command examples how to obtain a packet footprint of all traffic flowing thru your Juniper device running ScreenOS. I do not know the exact firmware requirement, but I think the fprofile command is availab…
The Cisco RV042 router is a popular small network interfacing device that is often used as an internet gateway. Network administrators need to get at the management interface to make settings, change passwords, etc. This access is generally done usi…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

791 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question