[ntp:questions] Re: ntpq -np
ronan at noc.ulcc.ac.uk
Mon Mar 21 16:30:39 UTC 2005
Charles <charles97 at dunjas.com> wrote:
> When the ntpq -np command is issued, the second column is labeled REFID.
> The number in the second column are always different from the numbers
> in the first column. I do not unstand the significance of the REFID
> I recognize that they are IP numbers, but what is the relationship?
The second column is the time-source to which the server in the first
column is synchronised. It can be another NTP server, or a reference
18.104.22.168 .MSF. 1 u 879 1024 377 4.607 -0.418 0.527
22.214.171.124 126.96.36.199 2 u 348 1024 377 1.538 -1.976 0.252
188.8.131.52 is synchronised to an MSF radio clock, 184.108.40.206 is
synchronised to 220.127.116.11.
> The term "reference clock" appears frequently in this newsgroup. It
> appears that is used to talk about the one clock with an asterisk
> beside it. Is that correct?
No, a reference clock is a hardware time source such as a GPS receiver,
MSF/DCF/WWV(B) receiver, high-precision pulse-per-second generator, etc.
Stratum-1 NTP servers are connected to reference clocks, and will usually
be synchronised to them, hence reference clocks generally show up with
'*' next to them in the ntpq -p display.
Ronan Flood <R.Flood at noc.ulcc.ac.uk>
working for but not speaking for
Network Services, University of London Computer Centre
(which means: don't bother ULCC if I've said something you don't like)
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