On Oct 18, 2011, at 12:38, Chuck Swiger wrote:
>> 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.
Yup, Los Angeles, CA. I'll probably add a second IPv6 monitoring node in
Europe relatively soon and if that works okay then monitor v4 nodes from there
as well.
Originally I thought this was a problem, but it turns out that at the precision
we target ("better than 100ms") it's a complete non-issue even for monitoring
servers on slow and weird internet connections on the other side of the planet
from here.
>> 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.
That's right. It's basically not as much of a problem as it sounds.
>> Is monitoring done from multiple independent ASes?
>
> Not at this time, I don't believe.
... and when it does the plan is that a failure from any of the monitoring
nodes will subtract from your score; so it'll mean everyone will be MORE likely
to have lower scores, not less. :-)
- ask
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