Bind9 (named.conf.option)

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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 {
        8.8.8.8;            //Google
        189.38.95.95;  //GigaDNS
};

//Opções de Segurança
        listen-on port 53 { 127.0.0.1; 172.16.0.100; };
        allow-query { 127.0.0.1; 172.16.0.0/24; }; //Rede Habilitada
        allow-recursion { 127.0.0.1; 172.16.0.0/24; };
        allow-transfer { none; };

        //========================================================================
        // 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; };
};