I have installed 3 new Win2012 R2 DCs, which will be the replacements for my Win2008 R2 DCs. I have repointed everything to use one of the new Win2012 DCs for DNS, rather than the Win2008 R2. And now I am seeing DNS errors.
Specifically, hosts will just drop out of DNS. (these are servers with static IPs). An nslookup will fail, and examining the zone will show no record at all for that server (even though that server has been in existence for years). Doing a "ipconifg /registerdns" on the missing server does make it show back up in DNS. But why is it dropping out in the first place? Event log on the DNS server (the server listed first in DNS settings for all my hosts) is showing occasional warnings of event 7062, finding a packet addressed to itself. Can't imagine what is doing that, I have checked and this DNS server doesn't have itself as a forwarder, and is on the notify list of the primary zone (notification is set to all servers on the NS tab, and this one is). So I am not sure what's going on, or what is causing it. Zone is set for "Secure only" dynamic updates, aging is set to scavenge stale records every 7 days (no-refresh and refresh interval) . These should be the defaults (we haven't changed the zone since we installed the Win2012 DCs. There is 1 wrinkle - we use SolarWinds, and their IPAM (IP Address Management). That software sets itself to receive zone transfers (so it can track DNS and DHCP), and so it is listed on the "Zone Transfers" tab, as an allowed server. But the "Notify" button is set to automatically notify only servers on the Name Servers tab. I know that there is zone transfer working from the SolarWinds server, I see event log entries showing zone transfer from that server. Anybody use this IPAM? I am going to try changing the notification list to be manual, and include the SolarWinds server.
