MacOS make etc/resolv-conf use secondary dns or rotate

I have a local DNS server (bind9) configured to resolve the fqdm of several servers that I have in my local network, until here everything OK. I put the ip of my local dns server and I can resolve the fqdm of my servers in my local network, but I can't surf the internet. I put the DNS of my internet provider next to the ip of my local DNS server (Bind9) , and I can only surf the internet I cannot resolve the names of any of my local servers. I try to configure my mac the file resolv.conf (/etc/resolv.conf) adding the line: -options timeout: 1 rotate attempts: 1 But this has no effect, I still can't resolve the fqdms of my local servers but I can navigate. I restart the mac and I still cannot resolve the fqdm and also the entry created in resolv.conf has been deleted :(. Any idea how to configure the DNS in macOS so that they rotate and can use the two DNS servers.