zone "my_local_private_domain" {
    type master;
    file "/etc/named/zones/my_local_private_domain";
};

zone "2.168.192.in-addr.arpa" {
    type master;
    file "/etc/named/zones/db.2.168.192";
};

forwarders      { 192.168.2.my_other_DNS; };

nslookup www.google.com
Server:         192.168.2.193
Address:        192.168.2.193#53

Non-authoritative answer:
*** Can't find www.google.com: No answer