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L2TP protocol

Posted on 2002-05-15
Medium Priority
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
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Accepted Solution

cincin77 earned 200 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.

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