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Every single VPN provider offers L2TP over IPSec. What is the reason GRE over IPSec is never offered ? Is there any downfall ? It seems to be exactly the same.

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So I have found the answer a year later while I was reading about IKEv1 vs IKEv2.

L2TP/IPSec makes it possible to use a username/password, because L2TP is built on top of ppp.

With GRE, that wouldn't be possible to authenticate with a username/password.

In IKEv2, you can use a username/password directly, so there is no need for L2TP.

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