: >From: Miroslav Lichvar
: >Sent: Monday, November 7, 2016 1:14 PM
: >
: >Scores for most Czech servers look ok, but at least one shows
: >something similar: http://www.pool.ntp.org/scores/147.231.100.5
: >FWIW, they are both on the Czech university network (CESNET).
:
: the situation around a low score of my pool server lx.ujf.cas.cz
: seems to be similar to that which occurred about six months ago and
: which had lasted about two or three days. Regardless the then
: connectivity problems towards LA Monitoring Server clients have
: existed, even in California, who did not have problems with my
: server. lx.ujf.cas.cz is also the public server stratum 2.
:
: http://www.pool.ntp.org/scores/147.231.100.5
: http://lx.ujf.cas.cz/ntp-lx/
The problem has been solved, and score of both servers
(lx.ujf.cas.cz and time.fi.muni.cz) is now near +20.
For future reference, the reason was that our common upstream
ISP (CESNET) had a rogue host connected to their network, which was a member
of NTP traffic-amplification botnet. The total NTP traffic from CESNET AS
was therefore too high, and it got probably policed somewhere between CESNET
and the pool monitoring server in LA, leading to occasional packet loss.
After cutting off that rogue IP address, the score of both pool members
connected via CESNET started to increase.
Sincerely,
-Yenya
--
| Jan "Yenya" Kasprzak <kas at {fi.muni.cz - work | yenya.net - private}> |
| http://www.fi.muni.cz/~kas/ GPG: 4096R/A45477D5 |
"i wonder how it would be if joerg schilling wrote perl modules."
-- from perldoc common::sense
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