Fabian Wenk kirjoitti:
I am not sure if the traffic pattern change I see on two of my NTP
server have something to do with this DNS update or not.
Please have a look at the graphs at [1]. Since March 1st (Friday) I see
a higher base level of requests on ntp1 + ntp3.home4u.ch and also lower
and lesser peaks on ntp2.home4u.ch and on ntp.bug.ch (a friends system).
The peaks are from the sntp requests out of the tr zone.
[1] http://www.home4u.ch/ntp/week.html
Do other admins of NTP servers (probably members in the tr zone) also
see such changes in traffic patterns?
I'm also seeing some oddities, although I've fiddled with my servers'
settings in the pool quite much in the last few days, so figuring out
what has been the reason for the oddities might be difficult.
So, initially I had two NTP servers in the pool, both configured at
100Mbit/s and served the FI and Europe zones.
http://www.pool.ntp.org/scores/80.69.163.42 = leopardi.miuku.net
http://www.pool.ntp.org/scores/80.69.172.80 = seepra.miuku.net
Then it turned out that both of those servers will likely be offline for
a while at some point in the next few weeks due to network
reorganization. So I figured I'd set their speeds to 384kbit/s to reduce
the effects of the potential outage to NTP clients. This happened at the
end of week 9, as seen in the graphs below:
http://leopardi.miuku.net/stats/ntppackets.html
http://leopardi.miuku.net/stats/participation.html
(I don't know why the participation numbers jumped a bit on Monday,
perhaps some other .fi server got out of the pool at that point)
This looks fairly normal -- the traffic started decreasing immediately,
and the spikes became much shorter.
However, the 2nd server had somewhat different graphs, even though it
received the exact treatment:
http://seepra.miuku.net/stats/ntppackets.html
http://seepra.miuku.net/stats/participation.html
The participation graphs look about the same, but the amount of traffic
didn't really drop much. You'll also see that the spikes are still there
for this server.
The spikes on seepra.miuku.net are of Turkish origin (although my server
does not serve the tr zone, but there have been such "leaks" previously
as well). What I'm wondering is that the allocations seem "stuck" and
the rotation doesn't seem to be working properly. I'd expect both
servers to get the equal amount of Turkish traffic, but it appears that
the Turkish traffic goes mainly to my 2nd server.
At some point today I had both of these servers marked as "deletion
due". This seemed to stop those servers from getting included in the
pool. I have now cancelled the deletion, but the servers are still at
384kbit/s.
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.
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