I need to decommission a 2008 server that was one of 4 DC's in the domain within the same subnet/site location. I was able to decom 2 others without issue for the most part but the last one I did caused issues with a few static devices 'losing internet' when their static assigned DNS server went missing.
I'm looking for a tool or a method of determining if a Windows DNS server is responding to client DNS requests. I also want to see if there was a way to determine with originating IP/subnet if possible as well.