I am having problems determining the best plan of action to resolve my issue. I have multiple internal VLANs that I would like to route DNS requests to various public name servers depending on the source network. We have a multi domain AD forest running DNS servers that support the clients in each network. I have set those local AD DNS forwarders to point to the UTM on all DCs. All outbound requests filter through a single UTM and out a single Internet circuit. The primary network is no big deal as it's using the built in Forwarders in the UTM global DNS settings. There is no way that I can see to bind DNS settings for each additional segmented network under the DNS settings in the UTM. My next thought is to use a NAT rule to intercept DNS traffic from the source network in question and send out to the correct public DNS server for that VLAN. I'm uncertain if this is the correct way this should be handled though. Please help me understand if this thinking is correct. Thanks for the help in advance!
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