Can you please elaborate on your question as it is hard to figure out what information you are trying to display in Firepower?
If you want to know the source IP of a DNS request that gets flagged because it goes to a known malicious IP or domains then Firerpower will need to modified to understand EDNS client subnet data. This data contains information about the client that makes the query. Unlike regular DNS which only has the source IP of the last hop. Infoblox supports EDNS client subnet data on NIOS 8.1 and later.
i want to know the source IP of a DNS request that gets flagged because it goes to a known malicious IP or domains.
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