Next we’ll dive right into the configuration part. It is not the fastest VPN solution because of the double encapsulation overhead but you can’t really notice it running on the modem hardware. It checks data integrity and encapsulates the data twice. L2TP/IPsec provides data confidentiality, data integrity, and data authentication.įurthermore, L2TP/IPSec supports the highest encryption. It supports either computer certificates or a pre-shared key as the authentication method for IPsec. Unlike PPTP and SSTP, L2TP/IPsec enables machine authentication at the IPsec layer and user level authentication at the PPP layer. Since vulnerabilities have been found in 3DES algorithms, using 3DES is no longer recommended. AES-256 (Advanced Encryption Standard), AES-192, AES-128, and 3DES encryption algorithms. The IPSec authentication trailer provides message integrity check and authentication.ĭata encryption is done with one of the following protocols by using encryption keys generated from the IKE negotiation process. The outer layer adds IPSec ESP (Encapsulating Security Payload) header and trailer to the first layer. The inner layer comprised of an L2TP header and a UDP header wrapped around the PPP frame. L2TP has two layers of encapsulations – inner L2TP encapsulation and outer layer IPSec encapsulation. the encryption is done by IPSec in transport mode. Even the underlying tunneling technology still utilizes PPP specifications. L2TP combines the best features of PPTP and L2F. L2TP is a combination of PPTP and Layer 2 Forwarding (L2F), a technology developed by Cisco.
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