From owner-freebsd-fs@FreeBSD.ORG  Tue Apr 15 14:18:28 2008
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Date: Tue, 15 Apr 2008 10:18:27 -0400
From: Jim Rees <rees@freebsd.org>
To: Adrian Gschwend <ktk@netlabs.org>
Message-ID: <20080415141826.GA8508@citi.umich.edu>
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Cc: freebsd-fs@freebsd.org
Subject: Re: mount_nfs, Kerberos & NFS4 on FreeBSD7
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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.