mount_nfs, Kerberos & NFS4 on FreeBSD7

[Jim Rees]

The v3 and v4 kerberos options are two very different things.  In v3
kerberos is an alternate security flavor, like auth_sys.  In v4, the
security flavor is gss, with kerberos as one of the possible mechanisms.

I don't know the status of kerberized v3 on FreeBSD, but the status of v4 is
not good.  We did a client only implementation many years ago but our
funding went away and it has not been maintained.  At this point I doubt it
works.  It never did support kerberos.