Hello everyone,
The software developed by me uses ntpq -p to periodically (every 10 seconds)
check ntpd time syncing status. ntpq output is parsed and fields “peer”,
“refid” and “offset” are extracted by index. This works fine until some strange
peer appears in the list for which both IP and DNS name are returned:
remote refid st t when poll reach delay offset
jitter
==============================================================================
0.debian.pool.n .POOL. 16 p - 8 0 0.000 0.000
0.002
1.debian.pool.n .POOL. 16 p - 8 0 0.000 0.000
0.002
2.debian.pool.n .POOL. 16 p - 8 0 0.000 0.000
0.002
3.debian.pool.n .POOL. 16 p - 8 0 0.000 0.000
0.002
LOCAL(0) .LOCL. 10 l 32 8 10 0.000 0.000
0.002
*193.11.114.43 ( 75.17.28.47 2 u 8 8 7 29.118 -0.185
2.276
5.20.0.20 193.219.61.110 2 u 7 8 7 82.714 0.315
0.717
-Time100.Stupi.S .PPS. 1 u 8 8 7 29.916 -2.316
2.894
+ntp2.ivlan.net 194.190.168.1 2 u 8 8 7 5.426 -0.772
2.666
+ntp1.ivlan.net 194.190.168.1 2 u 8 8 7 8.840 0.888
1.217
bagnikita.com 89.109.251.24 2 u 1 8 7 7.504 -1.115
1.227
78.140.251.2 194.190.168.1 2 u 1 8 7 14.441 0.937
1.559
mx2.volgaship.c 131.188.3.223 2 u 10 8 3 13.515 -0.317
0.939
See the line starting with “*193.11.114.43 (“
If I run “ntpq -pw”, then the output is the following:
remote refid st t when poll reach delay offset jitter
==============================================================================
0.debian.pool.ntp.org
.POOL. 16 p - 8 0 0.000 0.000 0.002
1.debian.pool.ntp.org
.POOL. 16 p - 8 0 0.000 0.000 0.002
2.debian.pool.ntp.org
.POOL. 16 p - 8 0 0.000 0.000 0.002
3.debian.pool.ntp.org
.POOL. 16 p - 8 0 0.000 0.000 0.002
LOCAL(0) .LOCL. 10 l 58 8 200 0.000 0.000 0.002
-193.11.114.43 (tor1.mdfnet.se)
75.17.28.47 2 u 4 8 77 32.737 1.864 0.675
-5.20.0.20 193.219.61.110 2 u 3 8 77 84.743 -0.631 0.543
*Time100.Stupi.SE
.PPS. 1 u 4 8 77 30.945 1.135 1.137
+ntp2.ivlan.net 194.190.168.1 2 u 4 8 77 9.237 1.225 0.860
+ntp1.ivlan.net 194.190.168.1 2 u 4 8 77 9.085 1.165 1.026
-bagnikita.com 89.109.251.24 2 u 7 8 37 7.879 -0.385 0.591
+78.140.251.2 194.190.168.1 2 u 7 8 37 14.324 0.418 1.500
-mx2.volgaship.com
131.188.3.223 2 u 6 8 37 13.515 -0.317 1.479
See the line starting with “-193.11.114.43 (tor1.mdfnet.se)”
This strange peer breaks extracting fields by index. For the above example it
extracts “(“ as “refid” value instead of “75.17.28.47” and “29.118” as “offset”
value instead of “-0.185”.
ntpq version is 4.2.8p10@1.3728-o Mon May 8 10:30:41 UTC 2017 (1)
Is this behaviour a bug or a feature?
Kind regards, Roman Mescheryakov
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