Hi,

   Using pipe backend with unix socket to connect to another process which
is responsible for sending response of DNS queries.
In case of NXDOMAIN there are multiple communication between PDNS and the
backend process. Below are the logs:

Jun 18 11:09:26 Query: 'Q       abc.com.my.domain.com   IN      SOA     -1      
127.0.0.1'
Jun 18 11:09:26 Query: 'Q       com.my.domain.com       IN      SOA     -1      
127.0.0.1'
Jun 18 11:09:26 Query: 'Q       abc.com.my.domain.com   IN      NS      -1      
127.0.0.1'
Jun 18 11:09:26 Query: 'Q       abc.com.my.domain.com   IN      ANY     -1      
127.0.0.1'
Jun 18 11:09:26 Query: 'Q       *.com.my.domain.com     IN      ANY     -1      
127.0.0.1'

However for cases when response is found then the communications are less.
here are the logs:

Jun 18 11:10:40 Query: 'Q       xyz.com.my.domain.com   IN      SOA     -1      
127.0.0.1'
Jun 18 11:10:40 Query: 'Q       xyz.com.my.domain.com   IN      ANY     -1      
127.0.0.1'

Is there anyway we can reduce the NXDOMAIN communication calls and make it
more faster?

-- IB



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