Fabian Wenk kirjoitti:
Hello Anssi
On 30.06.2012 11:08, Anssi Johansson wrote:
I don't know if this is related to the leap second, but it appears that
all of Turkey seems to be syncing their time right now.
Do you have limited and kod in the default config line?
But today I also had some similar high peaks (which I have not seen in
the past), but only for a short time, see [1].
[1] http://www.home4u.ch/ntp/
I just realized, that you count packets/sec, I count them as
packets/min. I take the numbers from 'ntpdc -c sysstats -c iostats' and
use 'packets received' and 'packets sent' and feed it to MRTG.
I am curios if your numbers are really packets per second.
Yes, those really are packets per second and I'm using the same method
as you for stats.
$ (ntpdc -c iostats; sleep 10; ntpdc -c iostats) | grep "packets sent"
packets sent: 882188250
packets sent: 882396875
$ echo $[ (882396875-882188250)/10 ]
20862
Yes, I have limited kod in my ntpd.conf. This time I can't blame some
single IP addresses for the extra traffic, but instead it looks like the
existing NTP clients have chosen to poll the NTP server a bit more
frequently. Some NTP client polling every 30 seconds doesn't sound that
bad, but if you multiply that by the number of clients (around 450000),
you get 15000 packets per second. That's largely the case here.
I'm not planning to change my NTP server configuration because of this,
because I have an educated guess that the traffic will return to normal
levels after we've passed the leap second. The traffic surge started at
around 03:00 local time, at which time my NTP server got to know of the
upcoming leap second and started announcing it in the replies. Once the
leap second has passed, those announcements will stop and hopefully the
traffic will also return to the previous levels.
I've also seen some peaks on my other NTP servers today, for example
http://leopardi.miuku.net/stats/ntppackets.html and I believe those are
also of primarily Turkish origin. I'm not particularly concerned about
those either.
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