can you (theoretically) run only NFSv4 (without earlier versions)?

[Tom H]

On Fri, Dec 20, 2013 at 2:34 PM, Robert P. J. Day <rpjday at crashcourse.ca> wrote:
>
> a long, long time ago, i reported an apparent glitch with NFS on
> fedora:
>
> https://lists.fedoraproject.org/pipermail/users/2010-January/097465.html
>
> in that, at the time, it *appeared* that you couldn't set up
> NFS so that *only* version 4 was running. before i start messing
> with this again, anyone know whether that's changed? that is,
> is it possible to set up a network in which only NFSv4 is running,
> and no earlier versions are supported? thanks.

It's been possible to run nfsv4-only nfs for a long time, with only
port 2049 being let through the firewall. It only appears that you
can't because because rpc.mountd has to run on the server but it's
only involved in the exporting and not the mounting.