vi /etc/bind/named.conf

### vi ###
# include "/etc/bind/named.conf.default-zones"

zone "int.worldskills.org" {
	type master;
	file "int-zone";
};

zone "worldksiills.org" {
	type slave;
	masters { 10.1.20.21; };
	file "dmz-zone";
};

zone "10.1.10.in-addr.arpa" {
	type master;
	file "int-v4-zone";
};

zone "0.1.0.0.1.0.0.1.8.b.d.0.1.0.0.2.ip6.arpa" {
	type master;
	file "int-v6-zone";
};

zone "20.1.10.in-addr.arpa" {
	type slave;
	masters { 10.1.20.21; };
	file "dmz-v4-zone";
};

zone "0.2.0.0.1.0.0.1.8.b.d.0.1.0.0.2.ip6.arpa" {
	type slave;
	masters { 10.1.20.21; };
	file "dmz-v6-zone";
};
### vi ###

vi /etc/bind/named.conf.options

### vi ###
allow-query { any; };
dnssec-validation no;
listen-on-v6 { any; };
### vi ###

cp /etc/bind/db.local /var/cache/bind/int-zone
cp /etc/bind/db.127 /var/cache/bind/int-v4-zone
cp /etc/bind/db.127 /var/cache/bind/int-v6-zone

vi /var/cache/bind/int-zone

### vi ###
@ IN SOA int-srv.int.worldskills.org. root.int-srv.int.worldskills.org.

@ IN NS int-srv.int.worldskills.org.
int-srv IN A 10.1.10.10
int-srv IN AAAA 2001:db8:1001:10::10
### vi ###

vi /var/cache/bind/int-v4-zone

### vi ###
@ IN SOA int-srv.int.worldskills.org. root.int-srv.int.worldskills.org.

@ IN NS int-srv.int.worldskills.org.
10 IN PTR int-srv.int.worldskills.org.
### vi ###

vi /var/cache/bind/int-v6-zone

### vi ###
@ IN SOA int-srv.int.worldskills.org. root.int-srv.int.worldskills.org.

@ IN NS int-srv.int.worldskills.org.
0.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0(14) IN PTR int-srv.int.worldskills.org.
### vi ###

systemctl restart named