INSTALL REQUIREMENTS
apt-get install bind9 bind9utils

EDIT CONFIG FILE BASED /etc/bind/named.conf.options
PREPAND
     >>  acl allowed_clients {
     >>  localhost;
     >>  10.42.0.0/24;
     >>  };

UNCOMMENT SECTOR forwarders TO

     >>  forwarders {
     >>        1.1.1.1;
     >>        1.0.1.0;
     >>  };
     >>  recursion yes;
     >>  allow-query { allowed_clients; };
     >>  forward only;


OUR NEW FILE SAVED AS named.conf.options
--------------------------------------
acl allowed_clients {
        localhost;
        10.42.0.0/24;
};

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;
                8.8.4.4;
        };
        recursion yes;
        allow-query { allowed_clients; };
        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;

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

------------------------------------------------

CHECKING BIND CONFIG
named-checkconf
systemctl restart bind9
systemctl status bind9

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Testing Out DNS Server on Client System
https://www.unixmen.com/setting-forwarding-dns-server-debian/