What is L2TP VPN and How Does it Work?
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L2TP stands for Layer 2 Tunneling Protocol, and it doesn’t provide any encryption by itself. However, L2TP usually uses an authentication protocol, IPSec (Internet Protocol Security), for strong encryption and authentication which gives it an ultimate edge on some widely used protocols like PPTP. L2TP/IPSec uses UDP ports 1701.
The data transmitted via the L2TP/IPSec protocol is usually checked or authenticated twice. Each data packet transmitted via the tunnel includes L2TP headers. As a result, the data is de-multiplexed by the server. Though the double authentication of the data slows down performance, it does provide the highest security.
One of the many reasons that make L2TP a popular protocol is that there are no known (reported) vulnerabilities in the protocol. Secondly, the double encryption gives users a peace of mind when they use the internet. Moreover, the protocol is natively supported by all Mac and Windows OS.
It works with AES or 3DES algorithms used for the most secure 256-bit key encryption.
L2TP uses the UDP Port 1701 for configuration, the UDP Port 500 for key exchange and the UDP Port 4500 for NAT.
Due to highest level encryption as compared to PPTP or other protocols and because of double encapsulation, L2TP is ranked among the safest protocols.
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