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-validation auto;

	auth-nxdomain no;    # conform to RFC1035
	// listen-on-v6 { any; };

        // allow-recursion yes;
        allow-recursion { 127.0.0.1; 172.210/16; 172.18/16; 51.255.66.199;};
        allow-recursion-on { any;};


};


logging {
        channel warning
        {
                file "/var/log/bind/dns.warnings.log";
                severity warning;
                print-category yes;
                print-severity yes;
                print-time yes;
        };

        channel general_dns
        {
                file "/var/log/bind/dns.log";
                severity info;
                print-category yes;
                print-severity yes;
                print-time yes;
        };

        category default { warning; } ;
        category queries { general_dns; } ;
};