27. "inetNetToMediaState - what values for !ipv6?  noNUD(7) or unknown(6)?"

    The description states use unknown(6) which is fine by me.
        
      If Neighbor Unreachability Detection is not in use (e.g. for
      IPv4), this object is always unknown(6) XXX ?noNUD(8)?."

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Bill: OK.  I think this was a leftover comment.