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Netflow and DNS (can we use Orion for forensics)

I'm wondering how Orion behaves when a users IP address changes- either due to DHCP, moving to a conference room or creating a VPN connection.

Does Orion resolve Netflow data to a machine name at the time the data is resolved and write that to a history table or is the resolution done when I query or report?

As an example- If I trade IP addresses with a colleque and query for each machine name will I see multiple entries? One for my previous address and one for my new? Or will Netflow just keep assuming the IP Address / hostname coorelation is static?

Also- I saw some posts last fall about DNS caching not updating properly every 2 hours and listed as a bug. Has this been resolved and in what version of NTA?