/etc/named/named.conf.ent2.com

zone "ent2.com" {
        type forward;
        forwarders { 
		10.40.2.31;
		2001:db8:4:441::31;
	};
};

zone "2.40.10.in-addr.arpa" {
        type forward;
        forwarders { 
		10.40.2.31;
		2001:db8:4:441::31;
	};
};

zone "4.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa" {
        type forward;
        forwarders { 
		10.40.2.31;
		2001:db8:4:441::31;
	};
};