We have our GTM devices answering queries for the domain names configured on those devices. However, the domain names that are not configured on the GTM, the GTM simply forwards it to the internal DNS servers.
Now, we have a cluster of DNS servers internally. i.e. cluster01, cluster02 etc.
As of today we only have cluster01 configured on the GTM.
My request is GTM should do forwarding to these DNS forwarding based on the incoming source IP.
i.e. if the source IP is 188.8.131.52 /24 forward the query to cluster01, if the source IP is 184.108.40.206/24 forward that to cluster02, if the source IP is 220.127.116.11/24 forward that to cluster03.
However, the GTM should still resolve the IP's for the domain names that are configured on the GTM.