Many different protocols are used when implementing an encrypted connection via VPN. The most common solutions rely on IPSec, L2TP over IPSec, and SSL.
VPN with IPsec : ‘Internet protocol security’ (IPSec) is a protocol suite designed for the internet protocol (IP) with version 6 (IPv6) and enables secure communication via non-trustworthy IP networks. Encryption and authentication mechanisms help ensure that the data traffic’s privacy, authenticity, and integrity are safeguarded. IPSec was developed with IPv6 and was retroactively specified for IPv4.
L2TP over IPSec : A VPN implemented with LTOP over IPSec uses the ‘Layer 2 Tunneling Protocol’ (L2TP). L2TP alone doesn’t contain any encryption. For this reason, the protocol is normally combined with IPSec. While IPSec is only able to tunnel IP packets, L2TP supports a variety of packet-transferring protocols. The combination L2TP over IPSec combines the strengths of both standards. The result is a highly secure and flexible tunneling protocol.
SSL-VPN : SSL was originally developed for use within HTTP environments. This is why the encryption protocol is used for securing VPN connections. Open VPN is a popular software solution for setting up a virtual private network.
