I reread http://www.ietf.org/rfc/rfc4122.txt and I'm pretty sure that
if getnode() is supposed to return a hardware address, one of the
following should be used:

  1) If ifconfig etc. returns successfully, we are fine.

  2) If uuid_generate_time() or UuidCreateSequential() are used
     to extract the node ID, we have to make sure that the returned
     UUID is in fact RFC_4122 and version 1.

  3) The fallback node ID should be 47 bits according to section 4.5.


I've got a new patch (getnode.patch) that takes care of these issues.