All machines are running Windows Server 2012.
We have a Domain Controller, DC1, that is also our primary DNS server. We have a secondary DNS server, DNS2.
All servers and desktops in the environment (60+) use DC1 as their primary DNS. All servers also use DNS2 as their secondary DNS. DC1 uses DNS2 as its primary DNS with loopback as secondary. DNS2 uses DC1 as primary and loopback as secondary. DC1 is set to notify DNS2 on changes for Zone Transfers. All desktop machines in the environment use DHCP. All servers have static IPs.
DNS2 is having an issue with its NIC that causes it to lose network connectivity. When that happens, all internal DNS resolutions immediately fail on all desktops and servers for 15-30 seconds. We're working on fixing the connectivity issue, but shouldn't DNS successfully resolve if the secondary is offline?
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