Hi All I have uploaded a tool I have been running over the last few months as it may be useful to others. [image] GitHub - gombadi/pool-dns: NTP pool dns tool NTP pool dns tool You can run it from a number of locations over a period of time and gathe…

Oh, did something similar a while back, by just running dig +short pool.ntp.org >> pool.txt in a loop, and vibe coded up a script to process the data to test a theory that was being discussed here at the forum. Seems you’re wanting to test pretty much the same thing?

Yeah I created this after one of the big anycast dns providers started including Argentina ip addresses for queries from NZ. The round trip time highlights distant servers. When you see a response with 400+ msec times you start to wonder why the system is providing it.

So you’re seeing this behaviour with one particular DNS provider? Afaik, if provided, the pool will make use of something called EDNS to derive your country from your IP address, as reported by your DNS server. Not all DNS services provide this for privacy reasons, in which case the pool uses the D…

I noticed in glancing at the code that if an NTP query fails, the code waits 1 second before retrying. I suggest at least two seconds as the default ntpd restrict ... limited ignores queries less than 2s apart. I’m guessing your code caches RTT to NTP servers, if so you’re likely not going to self…

A tool to help monitor pool DNS results

Server operators

gombadi November 1, 2025, 7:30pm 6

Was seeing it - Problems with Cloudflare DNS in NZ

When I test it today the highest RTT is 56ms which puts the server in Sydney area.

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A tool to help monitor pool DNS results

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