view external: query (cache) message for non existing domains

Mar  1 02:13:48 server named[51666]: client IP_address#4938: view external: query (cache) 'domain.com/A/IN' denied


This is seems to be a dns attack in your server and lots of messages are getting in /var/log/messages.

I have fixed this issue by adding ,

additional-from-cache no;

+++++++++++++++++

recursion no;

additional-from-cache no;

minimal-responses yes;

};

+++++++++++++++++

Here BIND server consider it as " additional-from-auth yes " and Cache disabled. BIND will follow out-of-zone records but since this requires the cache.BIND will return REFUSED for the out-of-zone record. In the case you have to set recursion no