I have taken over a network that has some DNS issues. Scavenging has not been active in over two years. I know that this needs to be setup on intervals to automatically run but the issue I am having is that this doesn't seem to do anything about the old host A files that already exist for machines that are long gone. On average each server on this network has 3 to 4 host A files attached to its ip address. I am very new to DNS so I am not quite sure how to deal with this issue? I can clean up the servers easily enough because their number is limited but i have 4000 plus clients that makes it unrealistic to try to fix the issue completely by hand.
I am sure there is a quick and dirty way to take care of this and any help would be great! I may just not be using scavenging correctly?