All,
I found that: http://www.greyware.com/kb/kb2012.717.asp
One of my internal NTP servers has the leap flag set to 01. The fake leap
second issue was produced in the servers where this NTP server is the time
source preferred, so I guess that it was my problem.
In order to check the leap flag I used ntpq.
First I checked what is the preferred NTP server with the "peers" command.
After that I ran the "associations" command in order to obtain the assids of
the NTP servers. When I had the assids, I check the status of the NTP servers
using the "pstatus" command (usage: pstatus ASSISD_NUMBER). In the "pstatus"
output I saw that the "leap" flag is set to 01.
$ ntpq
ntpq> peers
remote refid st t when poll reach delay offset jitter
==============================================================================
+ntp0.example.net 76.20.162.121 3 u 783 1024 377 0.296 2.173 0.772
*ntp1.example.net 187.35.120.100 3 u 943 1024 377 0.339 -1.158 0.481
LOCAL(0) .LOCL. 10 l 10h 64 0 0.000 0.000 0.000
ntpq> associations
ind assid status conf reach auth condition last_event cnt
===========================================================
1 12345 9424 yes yes none candidate reachable 2
2 12346 963a yes yes none sys.peer sys_peer 3
3 12347 8043 yes no none reject unreachable 4
ntpq> pstatus 12346
associd=123456 status=9424 conf, reach, sel_candidate, 2 events, reachable,
srcadr=ntp1.example.net, srcport=123, dstadr=192.168.10.1, dstport=123,
leap=01, stratum=3, precision=-20, rootdelay=124.969, rootdisp=63.766,
refid=187.35.120.100,
reftime=d3c3d39e.c685fc7f Wed, Aug 1 2012 16:11:10.775,
rec=d3c3d7ac.5f9dfe79 Wed, Aug 1 2012 16:28:28.373, reach=377,
unreach=0, hmode=3, pmode=4, hpoll=10, ppoll=10, headway=0, flash=00 ok,
keyid=0, offset=2.173, delay=0.296, dispersion=15.264, jitter=0.772,
xleave=0.012,
filtdelay= 0.30 0.33 0.30 0.36 0.35 0.35 0.35 0.30,
filtoffset= 2.17 2.01 1.80 1.68 1.49 1.25 1.14 1.00,
filtdisp= 0.00 15.75 31.91 47.49 63.14 78.63 94.43 109.95
ntpq> quit
$
Regards.
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