Rancher DNS : no recurser


I have a standalone Rancher with two hosts.
I also have a bind DNS in my network which has & as forwarders. My two hosts have this DNS in their “resolv.conf” and can resolv IP in both my own dns and internet.
But my containers in Rancher can only resolv the internal Rancher DNS and my own DNS but can’t resolv Internet.

So I check the answers.json in my rancher-dns container and I found something link this :

Where is my own DNS. I saw that there is no recurse in this conf, can it be the reason of my problem ?

Thanks !