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Does the dns sinkhole function require dns traffic to pass through the firewall perfectly?
If we use an internal DNS server, how should we configure it?
@Jeong for Gen6 you can enforce all DNS traffic run through the DNS proxy, but be aware this counts for UDP requests only, AFAIK.
Manage -> System Setup -> Network -> DNS Proxy
You need to check if this has checked in Gen7, but the options there are the same.
I would rather set up forwarding DNS requests from the DNS Server to the Firewall manually instead.