On Oct 18, 2011, at 12:22 PM, Kradorex Xeron wrote: > 1. Does monitoring verify an outage or is a single packet of non-contact > sufficient to indicate an outage, ergo a score reduction? How does monitoring > detect an outage?
You'd need to miss several monitoring requests before the score would be reduced enough to remove the server from being listed in the pool DNS. That just means that new machines would not ask for time from your server; existing clients would continue to use it, until they are restarted or otherwise reload pool.ntp.org addresses. It's documented on the scoring page, ie: http://www.pool.ntp.org/scores/24.103.228.244#graph_explanation "The Score graph A couple of times an hour the pool system checks the time from your server and compares it to the local time. Points are deducted if the server can't be reached or if the time offset is more than 100ms (as measured relatively crudely from the monitoring systems). More points are deducted the bigger the offset is." > 2. Where, geographically are the monitoring servers located? I believe the monitoring is located in California, CA. Ask would be able to provide more specific details. > How do they cope with issues with routing failures on the internet between > them and the NTP > hosts, where such failures may not be immediately rectified by intermediary > ISPs? They get their ISP to fix it. If the monitoring network is down, it's also likely that the NTP pool DNS servers are also unreachable or not providing fresh results, but that's hardly the end of the world-- other nameservers across the net would be caching the results for some time, and existing NTP clients would continue to operate without change. > Is monitoring done from multiple independent ASes? Not at this time, I don't believe. > The reason I ask this is that for the past several weeks I have been > observing > the server I operate accumulating every several hours a score degradation > when > the system and network is fully operational and serving NTP clients without > an > interruption on our end. Well, if you tell us what the IP is, we can take a more detailed look at the score graph and CSV log. Regards, -- -Chuck _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
