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Groups > linux.debian.user > #201613
| From | Gene Heskett <gheskett@shentel.net> |
|---|---|
| Newsgroups | linux.debian.user |
| Subject | Re: ntp problem in broadcastclients |
| Date | 2018-10-25 00:30 +0200 |
| Message-ID | <wMzP3-7OO-5@gated-at.bofh.it> (permalink) |
| References | <wMqsq-2dH-5@gated-at.bofh.it> <wMskx-3lD-5@gated-at.bofh.it> <wMsXg-3NW-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wednesday 24 October 2018 11:07:05 rhkramer@gmail.com wrote: > On Wednesday, October 24, 2018 10:27:04 AM john doe wrote: > > On 10/24/2018 2:44 PM, Greg Wooledge wrote: > > > On Wed, Oct 24, 2018 at 08:22:49AM -0400, Gene Heskett wrote: > > >> I has this machine running ntp normally, and set to broadcast on > > >> the $local/24 network. > > > > > > I've never used NTP in "broadcast" mode. > > > > > > If it were me, I would simply use the normal configuration in > > > which each client system has the NTP server's hostname or IP > > > address in the /etc/ntp.conf file. If it turns out this > > > "broadcast" thing is the problem, then I'm not the right person to > > > help. > > > > > > But... > > > > > >> Any clues of what else to check/change? > > > > > > Well, the obvious starting point would be "ntpq -p" on each > > > system. This is the new version of "ntptrace" which apparently has > > > been deprecated in order to make everyone's life harder. > > > > > > In addition to that, check the logs. If these are wheezy boxes > > > (or older) then you want /var/log/daemon.log*. If they're systemd > > > boxes, then you want (as root) journalctl -u ntp. > > > > In addition to the above, I would look at any kind of restriction > > (FW...) between the clients and the server. > > I think that covers what I was going to say, but in an attempt to show > off my knowledge (or lack thereof) ;-) > > As I understand it, NTP tries to get an approximate correct time for > each client machine by doing something like measuring the round trip > time to the server and back, then dividing by two, and applying that > as a correction to the broadcast time from the NTP server. > > That was my understanding "back in the day" and I assume something > similar is still occurring. > > On the other hand, it is hard to imagine that computers on your LAN > have a latency anywhere near 70 seconds in communication from your NTP > "server" on the same LAN (the one broadcasting the time). Standard pings are in the 1 millisecond range. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene>
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ntp problem in broadcastclients Gene Heskett <gheskett@shentel.net> - 2018-10-24 14:30 +0200
Re: ntp problem in broadcastclients Greg Wooledge <wooledg@eeg.ccf.org> - 2018-10-24 14:50 +0200
Re: ntp problem in broadcastclients john doe <johndoe65534@mail.com> - 2018-10-24 16:30 +0200
Re: ntp problem in broadcastclients rhkramer@gmail.com - 2018-10-24 17:10 +0200
Re: ntp problem in broadcastclients Gene Heskett <gheskett@shentel.net> - 2018-10-25 00:30 +0200
Re: ntp problem in broadcastclients rhkramer@gmail.com - 2018-10-25 01:20 +0200
Re: ntp problem in broadcastclients rhkramer@gmail.com - 2018-10-25 01:20 +0200
Re: ntp problem in broadcastclients Gene Heskett <gheskett@shentel.net> - 2018-10-25 00:30 +0200
Re: ntp problem in broadcastclients Greg Wooledge <wooledg@eeg.ccf.org> - 2018-10-25 14:30 +0200
Re: ntp problem in broadcastclients Curt <curty@free.fr> - 2018-10-25 15:40 +0200
Re: ntp problem in broadcastclients Gene Heskett <gheskett@shentel.net> - 2018-10-25 20:10 +0200
Re: ntp problem in broadcastclients Curt <curty@free.fr> - 2018-10-25 20:20 +0200
Re: ntp problem in broadcastclients Gene Heskett <gheskett@shentel.net> - 2018-10-25 22:50 +0200
Re: ntp problem in broadcastclients Greg Wooledge <wooledg@eeg.ccf.org> - 2018-10-25 23:00 +0200
Re: ntp problem in broadcastclients Gene Heskett <gheskett@shentel.net> - 2018-10-25 23:40 +0200
Re: ntp problem in broadcastclients Greg Wooledge <wooledg@eeg.ccf.org> - 2018-10-26 14:30 +0200
Re: ntp problem in broadcastclients Gene Heskett <gheskett@shentel.net> - 2018-10-26 15:40 +0200
Re: ntp problem in broadcastclients Greg Wooledge <wooledg@eeg.ccf.org> - 2018-10-26 16:00 +0200
Re: ntp problem in broadcastclients Gene Heskett <gheskett@shentel.net> - 2018-10-26 16:40 +0200
Re: ntp problem in broadcastclients Curt <curty@free.fr> - 2018-10-26 15:10 +0200
Re: ntp problem in broadcastclients Gene Heskett <gheskett@shentel.net> - 2018-10-26 15:50 +0200
Re: ntp problem in broadcastclients Michael Stone <mstone@debian.org> - 2018-10-26 16:30 +0200
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