Split DNS Server to use internal and external ip

First we need to setup our /etc/named.conf configuration

options {
        listen-on port 53 { 127.0.0.1; 192.168.0.107; };
        listen-on-v6 port 53 { ::1; };
        directory       "/var/named";
        dump-file       "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
        allow-query     { any; };

         forwarders {
                8.8.8.8; 8.8.4.4;
        };

        dnssec-enable yes;
        dnssec-validation yes;
        bindkeys-file "/etc/named.iscdlv.key";
        managed-keys-directory "/var/named/dynamic";
        pid-file "/run/named/named.pid";
        session-keyfile "/run/named/session.key";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

#Create a Access Control List for the internal networks that can query the dns

acl internals {
    127.0.0.0/8;
    10.0.0.0/24;
};


#Create 2 views  internal and external

view "internal" {
    match-clients { internals; };
    recursion yes;
    zone "example.com" {
        type master;
        file "/var/named/int.example.com";
    };
};


view "external" {
    match-clients { any; };
    recursion no;
    zone "example.com" {
        type master;
        file "/var/named/ex.example";
    };
};



Create 2 files as follow 1 for internal and other for external changing the respective ip for external and internal networks

int.example
; exaple.com
$TTL    604800
@       IN      SOA     ns1.example.com. root.example.com. (
                     2006020201 ; Serial
                         604800 ; Refresh
                          86400 ; Retry
                        2419200 ; Expire
                         604800); Negative Cache TTL
;
@       IN      NS      ns1
        IN      MX      10 mail
        IN      A       192.168.0.107
ns1     IN      A       192.168.0.107
mail    IN      A       192.168.0.107 ; We have our mail server somewhere else.



2. Start the named service
systemctl start named

3.- Check if the dns respose  to the query with nslookup
root#> nslookup
root#>server localhost
> example.com
Name:   example.com
Address: 192.168.0.107