zone "example.org" IN {
        type slave;
        file "slaves/example.com.org";
        masters { 192.168.1.100 };
};

How to configure a forward-only name server on CentOS 5

options {
directory       "/var/named";
forward only;
forwarders { 192.168.1.100; 192.168.1.101; 
};
};