Hi Mugo,
Whether chroot or not, I believe Bind forwarding works the same whether you have public DNS or not.
This should be configured under the options {} in your named.conf depending on your requirements.
Something like this where x.x.x.x is not necessarily a public DNS in your case.
options {
forwarders { x.x.x.x; x.x.x.x; };
};
If you are considering forwading for only certain requests, you can setup zone forwarding in your named.conf
type forward;
forwarders { x.x.x.x; x.x.x.x; };
};
Regards,
David.