I am having a problem with my organizations' Domain Controllers and my question concerns the failover of one DC to another. I have a mixed environment as I am slowly bringing the enterprise to Server 2016. The current environment: I have 2 physical DC's that are Server 2012 R2 and on virtual DC that is Server 2016.
I was doing some work on the network and one of the physical DC's named (DC1) was offline and while it was offline, the network came to a standstill. Users were immediately calling saying that they couldn't get out to the internet or access network resources (file server, printing). I was able to get the server back online, but it makes question whether the setup of the DC's are correct.
I have been researching and found info that tells me to set up Zone Transfers and yet other research says that I don't need to set that up. How do I enable failover from one Domain Controller to another? I am looking for resilency and thought I was protected by having 3 DC's on my network; only to find out that this isn't the case. The 2 physical DC's have their ip addresses entered in all static nics, yet my PC (has a static IP) didn't even move to the 2nd DC. Any information passed on, would be greatly appreciated.
Thanks.