Debian 9 Stretch
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Configure Slave DNS Server2017/06/21

Configure BIND as a Slave DNS Server.
The following example shows an environment that master DNS is [], Slave DNS is [].
[1] Configure DNS master server.
vi /etc/bind/named.conf.options
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

        // 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 {
        // };
        allow-query { localhost;; };
        # add a range you allow to transfer zones
        allow-transfer { localhost;;; };
        allow-recursion { localhost;; };
        // If BIND logs error messages about the root key being expired,
        // you will need to update your keys.  See
        dnssec-validation auto;

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

rndc reload

server reload successful
[2] Configure DNS slave server.
vi /etc/bind/named.conf.external-zones
# add settings like follows

        zone "" {
                type slave;
                masters {; };
                file "/etc/bind/slaves/";

mkdir /etc/bind/slaves

chown bind. /etc/bind/slaves

rndc reload

server reload successful
ls /etc/bind/slaves    
# zone file in master DNS has been just transfered
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