Several DNS requests at non-existent domain

RouterOS General
1

I would like to setup ROS to resolve sequentally by each DNS-server in list.
So, if I tried to resolve flibusta.lib, and 1.1.1.1 replied “name or service not known” ROS try next server 195.10.195.195, which will return the IP.
If any way to do it?

2

If the domains are foreseeable, I´d implement a basic conditional forwarder with L7 matcher and dst-nat.
And in case the returned addresses are all in a foreseeable subnet, you can even add a term for reverse lookup:

/ip firewall layer7-protocol
add name=„fibusta“ regexp=„fibusta.lib|[0-9]+.195.10.195.in-addr.arpa"

/ip firewall nat
add action=dst-nat chain=dstnat comment=„fibusta.lib“ dst-port=53 layer7-protocol=„fibusta“ protocol=udp to-addresses=195.10.195.195 to-ports=53
3

.lib is a non existing Top Level Domain (TLD)

Check for you own: https://data.iana.org/TLD/tlds-alpha-by-domain.txt

4

Unfortunately, it’s not foreseeable, moreover, it’s four DNS-servers, I would rike to request sequentally, if one said I don’t know, than request from next e.t.c. But, if the first resolve successfully, than return this result.

5

It’s part of https://www.opennic.org/

6

Using Unbound or other DNS resolver can do what you want by default. You can run it on a small computer like a RaspberryPI.

7

Yeah, in that case I´d recommend unbound as well.