acl goodclients {
	140.113.78.123; # ns1
	140.113.78.124; # ns2
        localhost;
        localnets;
};
 
options {
	directory "/var/cache/bind";
	recursion yes;
	allow-query { goodclients; };
	allow-transfer { none; };
        listen-on { 140.113.78.123; };
	forwarders {
		8.8.8.8;
		8.8.4.4;
	};
        
        dnssec-enable yes;
	dnssec-validation yes;
	auth-nxdomain no;    # conform to RFC1035
	listen-on-v6 { any; };
};