To prevent devices from the extra step of having to resolve domain name, I often use the IP for NTP servers references. These IP's dont change very often, so its a pretty safe bet to use IP's and not the domain names. Typically I configure NTP with a list of 5-10 servers.
Typically I set my monitoring server up as the NTP check point for all the other servers and network devices in my network. But I also provide each system with a list of fallback servers.
I like to use the pool servers from ntp.org
There are about 1700 active servers, today.
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