[ntp:questions] systems won't synchronize no matter what
snews at lordynet.org
Sat Oct 30 16:50:32 UTC 2010
David J Taylor wrote:
> "David Lord" <snews at lordynet.org> wrote in message
> news:t06tp7-n0b.ln1 at p4x2400c.home.lordynet.org...
>> You've hit on why it's difficult to have a generic ntp.conf.
>> It's not just ntpd version specific but operating system version
>> I swapped my NetBSD systems to FreeBSD after NetBSD-1.6x as I
>> couldn't get NetBSD-2 to work on my hardware. I swapped back
>> to NetBSD-3.x when I had hardware compatibility problems with
>> The default NetBSD ntp.conf for NetBSD 3.1 4.x and 5.1_RC4
>> are same:
>> pidfile /var/run/ntpd.pid
>> driftfile /var/db/ntp.drift
>> logconfig -syncstatus
>> tos minsane 2
>> server 0.pool.ntp.org
>> server 1.pool.ntp.org
>> server 2.pool.ntp.org
>> My own ntp.conf has restrict lines to allow config from
>> certain IP addresses and statistics logging enabled.
>> Local peers have 'minpoll 6 maxpoll 8 iburst' and are back
>> in sync within about five minutes from a restart. If all
>> peers are down, as a few weeks back when there was a BT
>> MSO, it was more like an hour before ntp was ticking again
>> (I need another couple of radioclocks to cover for this).
>> Remote servers have 'minpoll 9 maxpoll 11' except from
>> ISPs I use which have shorter minpoll and 'iburst'.
> This is growing out of all proportion to my original remark! I simply
> commented on the lack of an example ntp.conf file in a document.
> Something like:
> server 0.pool.ntp.org iburst
> server 1.pool.ntp.org iburst
> server 2.pool.ntp.org iburst
> would have done nicely as a sample, on which you can build. Like you, I
> have changed minpoll and maxpoll to suit my own needs, and added various
> other commands. Perhaps you would agree that's it's easier to have
> something working to start with, which you can then edit later as you
> understand more of how things work in practice.
> Anyway - any clue on: Why add maxpoll 9 to all the servers? That
> seems wrong. I see the note: "The option `maxpoll 9' is used to prevent
> PLL/FLL flipping on FreeBSD.". So is that a FreeBSD specific issue, and
> if so, why not fix it in the OS?
Was that not fixed in a later release?
(I don't follow FreeBSD but there were similar issues at
different times with NetBSD and Linux with kernel
timekeeping that were fixed in subsequent releases)
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