//
// Caching only DNS Server
// https://fxdata.cloud/tutorials/configure-bind-as-a-caching-or-forwarding-dns-server-on-ubuntu-14-04
//
//acl goodclients {
//      10.10.0.9;
//      127.0.1.1;
//      127.0.0.1;
//      localhost;
//      localnets;
//};

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;
        // };

        recursion yes;

//      allow-query {
//              goodclients;
//      };

        forwarders {
                8.8.8.8;
        };

        //forward only;

        //========================================================================
        // 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;

        dnssec-enable yes;
        dnssec-validation yes;

        auth-nxdomain no;    # conform to RFC1035
        //listen-on-v6 { any; };
        listen-on-v6 { none; };

        #----------------------------------------------------------------------#

        query-source address * port 53;

        listen-on {
                127/8;
        };
};