NFS security (was: Changing NGROUPS_MAX to 1024?)

> Is it?  My feeling - deriving largely from my experience - is that NFS
> is far more likely to be deployed in a private internal network than
> over relatively attackable networks like the open Internet.  Do you
> have reason to think that feeling is wrong in the large, that "new NFS
> installations" predominantly have threat models where on-the-wire
> attacks are significant enough for them to find NFSv3 unacceptable?
> (Honestly, my guess would be that most of them have not even formulated
> their threat model.)
The problem with NFSv3 is that the server believes the client.
So, if one of my 150 clients gets compromised, all user data is compromised.