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   [ check-names ( master | slave | response ) ( warn | fail | ignore); ]

   The defaults are:
         check-names master fail;
         check-names slave warn;
         check-names response ignore;

   check-names may also be specified in the zone statement, in which case
   it overrides the options check-names statement.  When used in a zone
   statement, the area is not specified (because it can be deduced from
   the zone type).

In your case you want to use:
	check-names master ignore;
	check-names slave ignore;

Regards,

Roy Arends
Nominum