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They are three different protocols allowing to tunnel encrypted traffic between two end points: - L2TP is the "layer 2 tunneling protocol", where the layer 2 i
by yaantc 9y ago
They are three different protocols allowing to tunnel encrypted traffic between two end points:
- L2TP is the "layer 2 tunneling protocol", where the layer 2 is usually PPP, and an IETF standard;
- IPsec is designed to tunnel IP over IP, and an IETF standard;
- OpenVPN is a specific software and protocol, using TLS. IF memory serves well it can operate at both Ethernet and IP level, although IP is the most common.
- cat199 9y agoTo add, L2TP is only tunneling and not encrypted, which is why it is often used in combination with IPSec. It is used instead of pure IPSec because it allows non IP traffic, which in some cases is more important (e.g. windows non-IP netbios traffic interop when L2TP/IPSec was first made popular) and to confirm, yes, OpenVPN will run in IP or ethernet mode.