Neil,

Here is a kernel patch that will enable the setting
of the port knfsd will listens on, the transport knfsd
will support and which NFS version will be advertised.

The nfs-utils patch, which is also attached, will added
the following flags to rpc.nfsd that will enable the kernel
functionality (Note: These patches are NOT dependent on each
other. Meaning rpc.nfsd and knfsd will still function correctly
if one or the other patch do or do not exist):


    -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.

Also Note: Both patches are in the latest release of the FC4 and
Rawhide which has definitely helped in the testing of these patches.

Please consider the kernel patch for inclusion for both the -mm and
mainline kernels.

steved.