[ntp:questions] Negative delay in 4.2.6p2

Marco Marongiu brontolinux at gmail.com
Tue Oct 11 09:10:36 UTC 2011


Hi all

Yes, negative delay. We see this on one of our clients (real IPs concealed):

> $ ntpq -c pe -c as
>      remote           refid      st t when poll reach   delay   offset  jitter
> ==============================================================================
> -10.100.100.142  22.222.222.6     3 m   66   64  376   -3.302    1.517   0.022
> +10.100.100.141  22.222.222.7     3 m   63   64  376   -6.828    0.083   0.025
> +10.100.100.161  222.2.22.84      3 m   54   64  376   -7.786   -0.756   0.035
> *10.100.100.162  22.222.222.3     3 m   50   64  376    0.314    0.609   0.031
> 
> ind assid status  conf reach auth condition  last_event cnt
> ===========================================================
>   1 61991  731a    no   yes   ok    outlyer    sys_peer  1
>   2 61992  741a    no   yes   ok  candidate    sys_peer  1
>   3 61993  741a    no   yes   ok  candidate    sys_peer  1
>   4 61994  761a    no   yes   ok   sys.peer    sys_peer  1


It's a multicast client with symmetric authentication, running ntpd
4.2.6.p2 on Linux Debian Squeeze. From our munin graphs, this started to
happen three weeks ago, and all in a sudden.

Is it a bug?

Ciao
-- bronto


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