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[Ntp] Re: NTPv5: Operational use case for server/node identification

"Marco Davids (IETF)" <marco.davids@sidn.nl> Sun, 07 June 2026 11:09 UTC

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Subject: [Ntp] Re: NTPv5: Operational use case for server/node identification
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Hi Daniel,

On Sat, 6 Jun 2026 09:06:01 -0400 Daniel Franke wrote:

> What do you think "same" should mean? 

The same FQDN and same IP address.

For example, anycast.ntspool.nl - an anycast service backed by 32 
servers distributed around the world.

Other examples are time.google.com, time.cloudflare.com, and 
time.facebook.com.

The idea is that it’s easier to pinpoint a specific instance, because in 
these scenarios a complaint like "time.google.com is 1 second off" is 
not actionable.

That would probably mean a 'yes' to all of your other questions, except 
the last one.

--
Marco

> On Sat, Jun 6, 2026, 04:57 Marco Davids wrote:
> 

>     In large-scale deployments, operators frequently need to determine the
>     exact node responding to an NTP query. This is particularly useful when
>     troubleshooting synchronisation issues, monitoring anomalies, or
>     operating anycast and load-balanced infrastructures where multiple
>     servers may share the same address.
> 
>     In the DNS world, operational mechanisms such as NSID (RFC5001) and
>     ID.SERVER (RFC4892) are commonly used for this purpose.

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