On Thu, 22 Feb 2018, Lennart Sorensen via talk wrote:
My understanding of NFSv4 is that it is not NFS. It is something new
and complicated that is way beyond what previous NFS versions did.
Sure it's called NFS, but it's different.
It is quite different but since NFS 4.1 it has looked the same at least. I'm able to switch between NFS & NFS4 in /etc/fstab and remount filesystems using a different version of the protocol. I've had to do this for debugging a few times.
I found something that seems to indicate it is possible to make NFSv4
run without kerberos and all that:
https://lists.debian.org/debian-user/2017/10/msg00476.html
I've run 4.1 without Kerberos for years.