A customer reported, that, after I set the DDNS scavenging interval from 7 days to 12 hours the DNS server scavenges static entries (i.e. A entries he entered by hand). This happened first after the scavenging setting has been changed. He punched in the records manually again, and the next day they were gone again.
unfortunately he is so p****** on me that he does not allow me near his DNS serevrs any more, because, so he says, my reconfiguration, which I considered absolutely harmless, caused a huge blackout in his network.
Trying to find reasons for this unexpected behaviour I found that a Microsoft DNS server is indeed able to touch static records, if they are considered "stale". See here:
http://technet.microsoft.com/en-us/library/cc784992(v=ws.10).aspx
Now unfortunately this documentation leaves totally in the dark how DNS tries to find out that a manually (!) entered record is stale, or, the other way round, how the host this record points to is supposed to tell DNS that the record is not stale.
Who can shed a light on this topic?
Thx
Armin.