On 03/04/2023 17:34, Arturs Laizans wrote:
> Documentation there provides such test script to be used:
>
> #!/bin/bash
> rm -f ./ntpstats/*
> ntpdsim -C .001 -T 400 -W 1 -c ./ntp.conf,
>
I know that the comma is included on the web page, but I suspect its
author was pursuing
Hans is right, but the huff'n'puff filter can alleviate that, provided that the
slower direction of the link is not permanently fully loaded, such that there
are times when the latency is the same in both directions.
On 3 December 2022 20:22:59 CET, MAYER Hans wrote:
>
>Is your Internet
On 01/05/2021 09:59, Viesturs Veckalns wrote:
> I experience the following problem in Ubuntu 20.04:
>
>
> v@v-VirtualBox:~$ sudo timedatectl set-ntp on
> [sudo] password for v:
> Failed to set ntp: NTP not supported
>
>
> I created a relevant question in
>
On 26/04/2019 11:03, David Woolley wrote:
> Recently I've been religiously reporting the Case Solutions spam that
> is appearing on the newsgroup side of this combined list and
> newsgroup, with no effect.
>
> The spam is being injected via Google, but their groups-abuse email
> address appears to
On 03/02/2019 00:39, François Meyer wrote:
>
> In case NIST servers are hard to reach, a metrologically defendable
> fallback could be to use ntp servers from another national metrology
> institute which would provide the same traceability to UTC.
I agree that this is a sensible answer from a
On 16/09/18 14:15, Sean Austin Critica wrote:
>
>
> Can I directly observe these sources and see which ones are stable
> (maybe by dumping them periodically, remotely from a machine with a
> known stable clock)? The OS in this case is RedHat EL 7.
>
>
>
"Directly observe": no. But you can
On 16/09/18 13:24, Sean Austin Critica wrote:
>
>
> I’m running on bare metal HP Gen9 blade. I have started looking at the
> BIOS settings and as far as I can tell there are a lot of options that
> affect CPU frequency and they are turned on.
>
>
>
> I will check tomorrow if ‘Spread Spectrum’
On 15/09/18 22:55, Mike Cook wrote:
> Maybe your server is frequency shifting . Check your BIOS settings .
Sean: plug "bios spread spectrum" into your favourite search engine for
more info.
You want to disable that for accurate timekeeping.
___
On 23/01/17 17:43, Lloyd Dizon wrote:
>
> On Mon, Jan 23, 2017 at 4:54 PM, Jan Ceuleers
> <jan.ceule...@computer.org <mailto:jan.ceule...@computer.org>> wrote:
>
> Could you show us the relevant extracts from your ntp.conf file
> related
> to
On 23/01/17 12:25, Lloyd Dizon wrote:
> I've installed a GPS module on a Raspberry Pi and I'm getting 1000ms
> offsets between the GPS readings and network NTPs.
Could you show us the relevant extracts from your ntp.conf file related
to the GPS source? That is: at least the server line and any
On 24/11/16 04:39, Harlan Stenn wrote:
> Announcements are supposed to be automatically sent to the announce
> list, which should cause them to appear on questions@ and hackers@.
>
> We'll dig.
Thanks Harlan.
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Guys,
Come on, why do I have to read about ntpd security patches in the press?
Why are they not posted here?
Thanks, Jan
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On 02/12/15 21:00, Joachim Fabini wrote:
> NTP algorithms rely on symmetric connection delay but DSL delay is
> commonly highly asymmetrical. In measurements for my setup (VDSL;
> 8Mbit/s DL, 768kbit/s UL), the VDSL one-way delay at low packet payload
> averages 12ms for DL and 6ms for UL. Very
On 01/06/15 14:45, Louis Demers wrote:
Hello,
What is your opinion about using a VM as NTP server?
Don't do it if you need accuracy. If you can't run ntpd on the bare
metal (e.g. for security reasons, or because the platform doesn't
support it) and if you can't justify dedicating a small box
On 28/02/15 08:48, catherine.wei1...@gmail.com wrote:
I still have a doubt: the key file is generated on my PC (as the first ntp
server) , when I copied it to the box(client), and I changed the box's ntp
server to a second server 3.cn.pool.ntp.org or some other ntp servers. The
On 28/02/15 03:47, catherine.wei1...@gmail.com wrote:
Is there anything wrong in my operation? Thank you.
Only thing I can think of is that the keys file might not be owned by
root. Is it?
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On 27/02/15 10:54, catherine.wei1...@gmail.com wrote:
However, when I run ntpq :
~ # ntpq
ntpq :config addserver 192.168.1.101 minpoll 3 maxpoll 4 burst
Keyid: 5
MD5 Password:(password corresponding to keyid 5 in /etc/ntp.keys)
***Server disallowed request (authentication?)
I don't
On 20/02/15 18:46, Roger wrote:
On Fri, 20 Feb 2015 12:45:54 +, Roger
invalid@invalid.invalid wrote:
After about 11 minutes it has dropped one, leaving 6 servers.
I'll continue to monitor and report back.
Just to recap, I now have this in my ntp.conf:
pool 0.uk.pool.ntp.org
pool
On 20/02/15 18:49, Rob wrote:
Why not just:
pool pool.ntp.org
That should be enough.
It returns only 2 servers (at the moment, and on my system):
root@hobbiton:~# dig pool.ntp.org
; DiG 9.9.5-3ubuntu0.2-Ubuntu pool.ntp.org
;; global options: +cmd
;; Got answer:
;; -HEADER- opcode:
I'd like to draw this list's attention to an idea that Reyk Floeter
floated, namely to use TLS to help sanity-check NTP timestamps:
http://marc.info/?l=openbsd-techm=142356166731390w=2
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On 10/02/15 18:19, Harlan Stenn wrote:
walter.preunin...@gmail.com writes:
Either I have missed it, or it is not there. My question is 'does ntpd
have to be restarted after a new leapseconds.list file has been
downloaded?'
No. The code looks for an updated file (daily, I think, more often
On 10/02/15 21:01, Brian Inglis wrote:
Use ntpq -c rv to check the leap second file has been updated and
a pending leap second recognized:
$ ntpq -crv
associd=0 status=0419 leap_none, sync_uhf_radio, 1 event, leap_armed,
version=ntpd 4.2.6p5@1.2349-o Jul 30 11:55:08 (UTC+02:00) 2012 (2),
On 11/02/15 07:57, catherine.wei1...@gmail.com wrote:
Hi, I also have a similar problem. In the newest ntp version 4.2.8p1, the
ntpdc is deprecated, what can I do if I still want to use it? Since in our
system, many ntpdc commands have been used. Can I resolve it by adding some
On 07/02/15 10:29, Rob wrote:
I presume you meant this followup to the multi PPS sources to a single
system and then it is not true either, of course our systems have
at least 4 cores and they can service multiple interrupts at the same
time.
On a single-core system I'd invert one of the PPS
On 07/02/15 19:10, William Unruh wrote:
Except I would not trust the gps to make the length of the pulse EXACTLY
1ms to the nanosecond say. Ie, the pulse length could vary by the
10usec. But I have not tested this and it may well depend on the
manufacturer. The pulse length is usually there
On 09/01/15 15:58, trackeroft...@gmail.com wrote:
Hello,
I'm looking for compiled NTP 4.2.8 for Windows. I know Meinberg's version but
unfortunately it is branded.
Does anybody know such binary package?
I want to avoid compiling it by myself if I can.
best regards
Johny
Johny,
What
On 21/12/14 14:08, David Taylor wrote:
I have been the fortunate recipient of a Soekris net4501, but although
I've written a Compact Flash card image it doesn't boot, from the CF
card, although the V1.23 BIOS appears to work. I may not spend too long
on this but could anyone point me to a
On 14/12/14 03:28, Harlan Stenn wrote:
Not that easy - unless you are one of the lucky few to have encrypted
access to a NIST source, when it may be automatic.
http://www.ietf.org/timezones/data/leap-seconds.list
Added to the Wiki at http://support.ntp.org/bin/view/Support/ConfiguringNTP
On 12/03/2014 02:58 PM, Brian Utterback wrote:
I still think that it takes four to
guarantee a majority but I don't have proof of that. Someday I will
spend some time to either prove or disprove it, but alas, time is
something I don't generally have extra to spend. But you are better off
with
On 07/07/2014 04:04 PM, Danny Mayer wrote:
I have no particular preference for the immutable time stamp value to
pick. Could be zero, could be some other meaningful value (such as
0xeee4baadeee4baad - twice Eek! Bad!).
KOD already sets a timestamp that is the requesters timestamp. See my
On 07/06/2014 08:42 AM, Rob wrote:
Harlan Stenn st...@ntp.org wrote:
Discussion appreciated.
I think it is best to remove KOD from ntpd.
It does not serve a useful purpose, because precisely the kind of
clients that you want to say goodbye to, do not support it.
In real life it has
On 07/06/2014 11:23 AM, Rob wrote:
Jan Ceuleers jan.ceule...@computer.org wrote:
I recommend providing motivation for the undesired clients to stop using
the server, by the server sending a regular response indicating that it
is not synchronised or replying in some other way that has
On 06/09/2014 05:50 PM, Marc-Andre Alpers wrote:
Hello!
Why have such important service no backup transmitter/antenna like DCF77?
Whereas DCF77 might have a backup transmitter (I don't know), I observe
DCF77 being down very often, albeit for short durations (5-10 mins).
When I do receive it
On 04/28/2014 07:37 PM, Henry Hallam wrote:
On Mon, Apr 28, 2014 at 10:14 AM, William Unruh un...@invalid.ca wrote:
Not sure why they would need a lower cutoff, except that it would allow
the ancient telephone receivers to comply. Certainly one can make
cheap receivers now that go a lot lower
On 04/24/2014 09:31 PM, Rob wrote:
all that is required to get PPS working is to fetch the source
package of ntpd for the distribution and recompile it while that
single file has been added. e.g. on Ubuntu that file is present
in the package pps-tools.
So please, on your build systems,
On 03/24/2014 03:53 PM, Paul wrote:
On Mon, Mar 24, 2014 at 12:26 AM, Danny Mayer ma...@ntp.org wrote:
That's a misconception. While I trust Richard Schmidt in what he says,
that's is not what you think he says.
It's hard to misinterpret 590SG load balancers and :
It is the load
On 03/24/2014 04:58 PM, Paul wrote:
On Mon, Mar 24, 2014 at 11:18 AM, Jan Ceuleers
jan.ceule...@computer.org mailto:jan.ceule...@computer.org wrote:
But I wonder what an active connection is in this context, since NTP
sits atop UDP.
These are IP based not TCP/IP.
So there's even
On 03/14/2014 08:12 AM, E-Mail Sent to this address will be added to the
BlackLists wrote:
Olivier Drouin wrote:
The thing with CDMA is that it looks like it'll not be
around for many years and I haven't seen any equipement
for 4g, hspa, LTE, etc...
IIRC, HSPA, UMB, UMTS, EVDO and EVDV
On 01/09/2014 06:15 PM, Dennis Golden wrote:
I give up. I see some of you able to post nicely formatted information.
What news reader are you using. I'm using pan2.
Your messages as seen here were properly formatted.
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Interesting Light Reading article on the degree to which infrastructure
(in casu wireless networks) is dependent on GPS timing signals, how
little is needed to jam GPS (intentionally or otherwise), and what the
impact of such jamming would be.
It also talks about how PTP might or might not
Guys,
Can you stop talking about email and news formatting and get back to
discussing NTP already?
Please?
Thanks, Jan
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On 12/23/2012 01:11 AM, Hal Murray wrote:
Fascinating to see you have less delay on the slower upstream!
The queuing delays depend upon the traffic. You control that.
The delays I quoted are fixed delays linked to the modulation, encoding
and other parameters used on my VDSL2 line (the
On 12/11/2012 12:49 PM, David Taylor wrote:
Sorry: catching up.
What happens if the link to the Internet is rather asymmetrical? For
example, here I am stuck with 30 Mb/s down, but only 3 Mb/s up.
The actual bitrate is not so important. True: it determines the time a
packet spends on the
On 08/13/2012 11:18 PM, Ali Nikzad wrote:
unable to bind to wildcard address 0.0.0.0 - another process may be running
- EXITING
So is another process already running?
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On 08/03/11 19:39, unruh wrote:
And exactly what is that difference? While ntp is perhaps too slow to
respond to local frequency changes, how do you see the difference
between keeping a computer's idea of local time accurate from keeping a
telecom's idea of local time accurate?
GPS is used not
On 16/01/11 09:11, Chris Albertson wrote:
No, if it is not _processed right at the UTC second it is pointless.
The Motorola GPS allows you to adjust the timing of the pulse to
account for delay in the antenna feed line and serial line.
I was also thinking about avoiding interrupt collisions.
On 16/01/11 11:25, Rob wrote:
Jan Ceuleersjanspam.ceule...@skynet.be wrote:
I was also thinking about avoiding interrupt collisions. In an ideal
world, if the PPS interrupt occurs exactly at the UTC second it is going
to coincide with the system's timer interrupt, is it not? That's even if
the
Piece of feedback below.
On 11/12/10 13:07, Brolin Empey wrote:
I run Windows 7 Professional IA-32 with RealTimeIsUniversal=1 on
brolin-V13, my Dell Vostro V13 laptop. This means brolin-V13’s hardware
clock (RTC) runs in UTC, as it should, instead of the local time zone,
as Microsoft still uses
On 11/10/10 00:44, Chris H wrote:
Does anyone have any info on how if possible to make a Linux computer,
synced to GPS become an LTC (Broadcast EBU SMTPE) master clock
generator?
The LTC page on Wikipedia [1] includes a link to a project on
Sourceforge aimed at encoding and decoding LTC in
Maarten Wiltink wrote:
Why did you get 4801s? I recall reading here that the 4501 was no longer
for sale, but Soekris' own website offers them.
I didn't get them specifically for timing purposes, but rather to act as a
platform on which to build my own access routers (with added DSL and wifi
Terje Mathisen wrote:
The canonical DIY ntp server would be to base them on phk's choice, the
Soekris single-board computer:
http://phk.freebsd.dk/soekris/pps/
Since this board has a hw counter capable of accurately timing the PPS
signals,Poul-Henning got it to run at sub-us accuracy,
unruh wrote:
They have high accuracy atomic clocks orbiting up there already (GPS,
Galileo,...) What is significant about this?
Firstly, the linked press release talks about certain physics experiments which
can presumably only be carried out in orbit and which require highly accurate
clocks.
David Lord wrote:
How do you get the time difference between your GPS and system
time?
Include the GPS in your ntp.conf, but mark it with noselect on the server
line.
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David J Taylor wrote:
For those without wide-bandwidth academic connections - those folks on
cable or ADSL - how good is an equal split round trip assumption?
I calculated this for my case once (3840 kbit/s down and 512 kbit/s up). The
difference in transmission time due only to the different
Dew Wrobel wrote:
I have to setup a couple of servers that will get their time from the
internet.
[...]
When I start NTP, the start up hands with ntpdate trying to get the
time from the servers. I have verified that the server names do
verify in DNS.
Do I need to pick a different set of
T wrote:
We have about 50 Linux/Solaris/Windows boxes running ntpd at several
different sites. Some of the systems from time to time go out of sync.
My question is there a way to test ntpd machines are all in sync with
the master
server?
The easiest way I can think of is to poll those
T wrote:
Got a couple of quests here. He had box1thru50.domain.tld What does
the .tld mean?
I dropped that in the configuration file... Is the .INIT. in the
refid field a problem? These are
all Solaris boxes...
Tom,
Replace the box1thru50.domain.tld with the DNS names of your 50 boxes. If
Dave wrote:
But setting the time from the local server is also going to be cause a
problem if that server fails for some reason.
What I do here (in my home network) is make the NFS server also an NTP server,
and make sure that the NFS clients prefer the NFS/NTP server over any others.
(In
Joe wrote:
Timezone data is fairly dynamic. It makes sense to have some form of
network service to update timezone data. Does anyone know if there
have been any proposals about a standardized timezone update protocol,
or reasons why there should not be one? Since NTP is well established,
Brian Utterback wrote:
Decreased bandwidth means increased latency. The two are related.
Only indirectly so.
There are at least two components to the higher latency on the ADSL
uplink as compared to the downlink. A minor component is the fact that
the lower bitrate means that equal-sized
Unruh wrote:
I am totally confused. The cpu is in sleep mode. The cpu is not doing
anything. ntp is NOT running. ntp cannot wake up the cpu because ntp is not
running. Only external events can wake up the cpu, and ntp is not an
external event. So, once the cpu is woken up, and ntp can run,
David Woolley wrote:
packet shows up, which with laptops I know will considerably degrade the
I'm not convinced this is even about laptops. I think it is about PDAs,
or about embedded systems that may run for a year on a couple of AA
bateries, or may run on small photocell arrays.
I
Bill,
Bill Unruh wrote:
Now of course I suspect that the kernel has to wake itself even more often
than once a second (eg the timer interrupt) and if it did not, the effect
on the time discipline would be pretty bad.
The Linux kernel has recently gone tickless, meaning that it only
David Woolley wrote:
Have they considered the resulting increased processing time, and more
importantly, variability in processing time of gettimeofday?
That's why I'm raising the question here. If anyone on the ntpd team has
contacts at Red Hat, a brief discussion about this would be of
I came across the following page:
http://www.lesswatts.org/projects/powertop/known.php
which says the following on ntpd:
By default, the ntp time synchronization daemon will wake up once per
second, and will make the kernel do work on it's behalf even more. Red
Hat has created a patch to ntp
Martin Burnicki wrote:
I'd expect that either the kernel routed multicast packets to all interfaces
(isn't that what routers do with multicasts, contrarily to broadcasts?), or
the application would send an individual packet on each interface.
Routers have to be told (by means of multicast
David,
David Woolley wrote:
ISTR that time stamps on financial transactions are required to be
within two seconds of the correct time. With NTP that standard is not
too difficult to meet.
In 2006, it turns out that it was 3 seconds
http://tf.nist.gov/general/pdf/2125.pdf,
NIST is a US
Harlan,
Harlan Stenn wrote:
Jan I really hate being sent from left to right in search of
Jan documentation. This includes stub man pages pointing me at html or info
Jan pages. Ideally I'd want to be able to select the documentation format
Jan on a system I'm responsible for myself (i.e. as a
Hal Murray wrote:
When I wrote that I was unaware of the html page. I'm a Unix guy and I
generally don't even consider looking for html docs - I am used to (and
expect) man pages.
Me too.
Would it help to ship dummy man pages that just pointed to
the html documentation?
Can I just get
Hi Dean.
Dean S. Messing wrote:
Can I however suggest that you first try and eliminate CPU frequency
scaling as a cause of the symptoms you're seeing: use cpufreq-set -g to
select a policy that results in a constant CPU frequency and then check
if this changes the behaviour (or renders it
Dean,
Dean S. Messing wrote:
I am seeing strange behaviour on my _x86_64 Fedora 7 desktop
workstation with regard to the system-cmos time that `adjtimex'
reports.
I've not read your whole post; it's clear that you've been wrestling
with this problem for a while and have done quite a bit of
Richard B. Gilbert wrote:
I believe that there is a solution to the DNS caching problem. Each DNS
record can be given a Time To Live or TTL. If you are planning to
change the record, set the TTL to seven days, then six, five, four,
three, two, one. . . . All of those cached records
Danny Mayer wrote:
Jan Ceuleers wrote:
This means that there is no need to allocate memory for constructing the
reply packet, no need to copy data from received to transmitted packet, etc.
This is also false. That's not what the code does. The recvbuf structure
is not even the same size
[EMAIL PROTECTED] wrote:
Just look at the NTP/SNTP request format and for ***every*** field
explain why would a client send it to a server. Do not pick just one
field like MODE, explain for ***all*** fields.
I believe that the principal reason for having the same format for the
received
linux newbie wrote:
HI,
Need following clarification.
Our Application needs to have two individual hardware (with DSP processor)
to have same crystal clock freqency. Though individual boards are alike, due
to environmental factors there might be drift after long run.
This suggests that you
[EMAIL PROTECTED] wrote:
Does anybody know of any *practical* samples on how to
implement NTP/SNTP client?. The goal is to provide accurate
time for a program/client running on Windows Vista.
Have you seen the sntp directory in the reference implementation tarball?
rasmus wrote:
The _first_ rule in your INPUT chain needs to explicitly allow all
traffic to 123/UDP. Something like this:
Sorry, I was unclear. The rule I referred to was one that allowed udp/
123 traffic. So I have a rule exactly matching what you wrote at the
head of my INPUT chain. I can
rasmus wrote:
This sounds as though your firewall is opening port 123/UDP in response
to polls sent to remote time servers from your ntpd.
That could indeed then explain the blinks in my availability as
reported by the pool. How often does ntpd per default sync time with
the configured
Maarten Wiltink wrote:
Keeping a room at a constant temperature might actually be easier
than the other thing you could do - not run *any* other services
on the computer. No cron at 3am. (Alternatively, make it run at 100%
CPU always. Perhaps [EMAIL PROTECTED] would be _good_ for stability.)
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