mount nfs from freebsd 7: protocol not supported

[Matthew Dillon]

    Now that you have it working, if you are doing more then just
    playing a bit with it please be sure to use a TCP mount and
    not a UDP mount.  Particularly between FreeBSD 7 and any
    recent DragonFly.  A DragonFly client is capable of queueing
    upwards of 50+ RPCs to the server concurrently and UDP mounts
    will blow up (basically throw data away due to the socket buffers
    not being anywhere near large enough, causing stalls).

					-Matt