I have a set of 3 Windows 2012 Server VMs running as my domain controllers. These VMs are in an air-gap environment, meaning no access to upstream NTP servers.
I haven't been able to configure my ESXi hosts (running version 6) to act as NTP clients syncing with the W32time service on the DCs.
Each time I try an NTP query on the ESXi host, all I get is a timeout.
I am using the command
ntpq -p "IP address of DC".
tcpdump on the ESXi hosts shows the outbound query packet, but no reply packet.
Is the lack of an upstream NTP server causing the problem?