Hello Anssi
On 13.03.2013 21:18, Anssi Johansson wrote:
I think it's plausible that some pool servers are now "stuck" serving
the Turkish clients, while some other pool servers do not get those
clients. I don't know how that's possible, but the results look like
that's happening.
It really looks like this, 4 of the 5 servers I collect data from
(ntp1-3.home4u.ch and ntp1.bug.ch, all with 10 Mbit/s) are also
in the tr zone. But only two of them (ntp1+3.home4u.ch) get more
traffic, which is still increasing. On the other two servers the
typical tr peaks are almost gone.
http://www.home4u.ch/ntp/month.html
(change do week and/or day view on top for more current details)
@Ask: Could it be, that the DNS rotation does not use all the IP
addresses from a zone in the same way?
Alternatively it could be, that the resolving DNS servers from
this large ISP in tr does cache the answers longer as was the
Pool DNS is announcing.
Maybe it has something to do with the interval of this devices
doing the sntp request (and those also resolve through DNS),
which does mess with the currently set TTL of 150. Eventually
setting it to a more random value like e.g. 143 (or 157) could
help. So it does not change exactly every 2.5 minutes, which
could be bad if the devices do the query on an exact multiple of
this, e.g. every 10 Minutes.
bye
Fabian
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