Here is an other attempt to make the '-p port' command line
argument to rpc.nfsd work plus define which network transports
should be advertised as well as define the protocol versions
that should be advertised.

The difference between these patches and the prior ones is
I've broken up the setting of the versions and ports/transports
into two different files.

To set the port and transport you write a string in the
format of "family transport address port" to the
/proc/fs/nfsd/ports file. An example would be
echo "ipv4 tcp 192.168.0.1 2049" > /proc/fs/nfsd/ports.
Currently only the transport and port are looked at.

To set the protocol version you write a string in the
format of "[+/-]vers [+/-]vers" to the proc/fs/nfsd/versions
file. An example would be echo "+2 +3 -4" > /proc/fs/nfsd/versions
which would turn off version 4.

These patches also added the command line arguments to rpc.nfsd:

     -N  or  --no-nfs-version vers
         This option can be used to request that rpc.nfsd does not  offer
         certain  versions of NFS. The current version of rpc.nfsd can
         support both NFS version 2,3 and the newer version 4.

     -T  or  --no-tcp
         Disable rpc.nfsd from accepting TCP connections from clients.

     -U  or  --no-udp
         Disable rpc.nfsd from accepting UDP connections from clients.

I've been getting a lot of requests for this type of functionality both
on the Fedora Core and RHEL fronts, so I'm hopeful this these patches
will be consider for inclusion in a upstream kernel and nfs-utils
package.

steved.