When manually configuring VPN, the type can be set to either "IKEv2", "IPSec" or "L2TP".
However, as I understand it "L2TP" use "IPSec" for encryption and "IKEv1" for authentication, so it find the different terms used for type confusing.
The different options are shown in the Apple iOS version 12 page at Settings => General => VPN => Add VPN Configuration => Type, as shown in the image below.
What is difference between "IKEv2", "L2TP" and "IPSec" in VPN type?
Best Answer
They all are based on IPsec, but the protocol used to create the IPsec SAs and authenticate the peers is different (and there is an additional encapsulation layer for L2TP).