Hi, Our NTP servers always have a 20+ score, but suddenly it becomes -70 when I checked the logs here https://www.ntppool.org/scores/212.26.18.41/log?limit=5800&monitor= * we noticed that the drop happened when the monitoring station changed from “Los Angeles, CA (old)” to “Newark, NJ, US” 15570…

Hi Ibrahim, Exactly the same for me here in Switzerland. The IPv4 was awful since 5.5 @19:43. Moment of switching between LA monitoring station to Newark. IPv6 is still OK. It seems that a transit provider is doing ratelimiting on NTP packets on its backbone. Other operators experience the same b…

It’s why we need more than one probe on different continents.

@jacota thanks for your reply, can you share with me how to do NTP measurements with RIPE Atlas probes? is there is any way to know the bad traceroute? I can reach Los Angeles Monitoring station and i expect it is IP address is 207.171.3.17 but i am not sure what is the IP Address of Newark Monitor…

[image] ialbarki: i am not sure what is the IP Address of Newark Monitoring station. According to previous posts, the current server shall be 139.178.64.42… [image] Problems with the Los Angeles IPv4 monitoring Station Server operators A major update on this! My se…

Thanks, @alica , I am not sure, but I know that there are multiple monitoring stations one in Los Angeles, CA (old and another in Newark, NJ, US, I can’t find any details about the IP address of these two monitoring stations. if you did a quick lookup for the IP address 207.171.3.17 you will find i…

Hi @ialbarki , If you are member of RIPE Atlas and if you host a Probe or an Anchor, you get credit and with this credit, you can run measurment from other probes arround the world. Measures include ping, traceroute and also ntp query. When you create a measurement you can set probes candidates bas…

@ialbarki The IP of your NTP belongs to an IP pool of Level3 a.k.a. Centurylink, so therefore routers belonging to Level3 are being traversed (of course). As stated in my post here , I “proofed” that there are some weird NTP problems which can be tracked down to aggressive rate limiting of NTP traf…

I added a monitoring system in Holland (Amsterdam) to the beta system tonight: https://web.beta.grundclock.com/user/ask Still todo: Finish packaging the software so others can run it more easily Figure out scoring system for the monitors and how to distribute the checks Self-service sign-up for m…

[image] ask: I added a monitoring system in Holland That’s very good news for us Europeans, stuck in the middle of nowhere between America and Asia… [image] ask: Finish packaging the software so others can run it more easily Do you mean it will be possible to run probes without the ne…

[image] ask: Figure out scoring system for the monitors and how to distribute the checks I think median score from all monitors would be a good start. With a larger number of monitors it could be shifted lower, maybe 25th percentile, meaning a server needs to be considered good by at least 7…

Monitoring stations timeout to our NTP servers

Server operators

alica May 22, 2019, 8:31am 5

According to previous posts, the current server shall be 139.178.64.42…

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Add server produces: ""Could not check NTP status Server operators	36	1770	November 5, 2020
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Monitoring stations timeout to our NTP servers

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