Some mount programs call the NFSPROC_NULL procedure _before_ mounting
a filesystem. They do this because the portmapper GETPORT procedure
ignores the version no. of the program so you have to call an nfs
procedure to discover if there is a program version mismatch.
When a filesystem is exported to the world, to a netgroup, or to a
wildcard DNS name (eg. *.ac.uk), the kernel is not told which machines
have access to the filesystem until the client machines call the
mountd to mount the filesystem. At the point when NFSPROC_NULL is
called, the client is unauthenticated.
knfsd responds to requests from unauthenticated clients by dropping
the request on the floor, so the client never gets a reply and says
that the nfs server is not responding. Solaris 2 and amd will fail
to mount the filesystem.
Peter
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