options {
	directory "/var/cache/bind";

	// If there is a firewall between you and nameservers you want
	// to talk to, you may need to fix the firewall to allow multiple
	// ports to talk.  See http://www.kb.cert.org/vuls/id/800113

	// If your ISP provided one or more IP addresses for stable 
	// nameservers, you probably want to use them as forwarders.  
	// Uncomment the following block, and insert the addresses replacing 
	// the all-0's placeholder.

	// forwarders {
	// 	0.0.0.0;
	// };

	//========================================================================
	// If BIND logs error messages about the root key being expired,
	// you will need to update your keys.  See https://www.isc.org/bind-keys
	//========================================================================
	dnssec-enable yes;
	dnssec-validation yes;
	dnssec-lookaside auto;
        key-directory "/etc/bind/keys/";
	listen-on-v6 { any; };
          
          // hide version number from clients for security reasons.
	  version "not currently available";
         
          // disable recursion on authoritative DNS server.
          recursion no;

          // enable the query log
          querylog yes;

          // disallow zone transfer
          allow-transfer { none; };
};