On 08/06/11 19:43, "Martin v. Löwis" wrote:
When it shows an unsuccessful poll, I don't see a query at that time,
but I do typically see a couple of others at about the relevant time,
perhaps 4 - 6 seconds apart. These ones don't appear in the monitor log.
The most likely explanation is routing glitches. I'd try to establish
a traceroute between the monitor and the server and see whether this
reveals oddities.
That doesn't explain why several other people were observing exactly the
same thing, and why fixes at the monitoring end corrected it.
Tracing to your system, I get
...
6 10gigabitethernet5-3.core1.lon1.he.net (2001:470:0:1d2::1) 30.992
ms 30.548 ms 30.881 ms
7 a.armless.thn.aaisp.net.uk (2001:8b0:0:53::5a9b:3506) 25.585 ms
26.004 ms 25.919 ms
8 b.gormless.thn.aaisp.net.uk (2001:8b0:0:53:203:97ff:fe05:c000)
26.413 ms 26.055 ms 26.437 ms
9
7.a.0.1.0.0.0.0.0.0.0.0.0.0.0.0.1.1.1.1.1.1.1.1.0.b.8.0.1.0.0.2.ip6.arpa
(2001:8b0:1111:1111::10a7) 671.539 ms 667.176 ms 674.588 ms
10 * * *
11 * * *
Notice that the first hops have pretty good roundtrip times, and then
performance degrades massively when it hits your network; 0.5s is a
really bad roundtrip time for an NTP server.
Can't explain that. The monitoring server now sees responses from my
end with consistently < 10ms drift.
Cheers,
John
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