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Informationen (einschließlich Pflichtangaben) zu einzelnen, innerhalb der EU tätigen Gesellschaften und Zweigniederlassungen des Konzerns Deutsche Bank finden Sie unter https://www.deutsche-bank.de/Pflichtangaben. Diese E-Mail enthält vertrauliche und/ oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese E-Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser E-Mail ist nicht gestattet. On 09.04.2023 08:24, Harlan Stenn wrote: > 4 is better than 3 because from time to time, one of them will be > unreachable. If one uses 3 and this happens, there is nobody to break a > tie. > > I recommend also having these top-tier time sources 'peer' with each other. > > What is your "interesting" issue with leap seconds? > > H > > On 4/8/2023 7:49 AM, MAYER Hans wrote: > > > > Dear All, > > > > I would say 3 ntp servers are also fine and good enough as there are never > > taken more than 3 servers. > > If there are no stratum-1 server available I would define at least 4 pools > > for these 3 NTP servers. > > > > I can tell you what I have done. Without claim to be correct. > > I have 3 stratum-1 server ( GPS, DCF77 and rubidium disciplined ) > > The GPS and DCF77 are peered with the same type of server with another > > organisation. In case the stratum-0 source would fail. > > Below this I have 4 stratum-2 server which have also upstream servers from > > the Internet. Just in case all 3 internal stratum-1 would fail. > > There I am using two different types of daemon software. And 3 of these 4 > > servers are public available as part of the AT-pool (Austrian) for IPv6. > > And internally I use only 2 stratum-3 servers for all clients. Good enough > > as I manage and monitor complete NTP infrastructure. > > These stratum-3 servers have defined all 4 of my stratum-2 servers I have > > and are not using any external time source. > > > > In my opinion it is not important to be accurate within a millisecond to > > the real time. It is more important that all devices have the same time. > > This becomes interesting especially if there is a leap second. > > Therefore all clients are not allowed to fetch the time from Internet and > > such traffic is prohibited by firewall. > > To avoid that mis-configured clients have NO time I am using RPZ ( > > restricted policy zones ) in DNS where a lot of well known DNS names for > > NTP servers are rewritten to the internal IP address. > > > > > > Kind regards > > Hans > > > > — > > > > > > > >> On 08.04.2023, at 13:37, Terje Mathisen <terje.mathi...@tmsw.no> wrote: > >> > >> Renzo Marengo wrote: > >>> Il giorno venerdì 7 aprile 2023 alle 13:44:59 UTC+2 David Woolley ha > >>> scritto: > >>>> On 07/04/2023 10:47, Renzo Marengo wrote: > >>>>> I know NTP server numbers must be 1, 3 or 4,.... > >>>> I don't understand this. NTP servers don't have numbers. They do > >>>> have a stratum, but that is determined automatically from the > >>>> current time distribution tree. > >>> I wanted to say... the number (quantity) of ntp server. Now I have 3 > >>> ntp server(NTP1, NTP2, NTP3), if I had had 2 servers it should be > >>> always a good idea ? I remembered there was a reason to have a > >>> similar quantity (that is 3) > >>> Server A has stratum 2 Server NTP1, NTP2, NTP3 has stratum 3 > >>> What do you think if I destroyed the Server A and I converted the > >>> NTP1, NTP2, NTP3 to stratum 2 ? I would link these 3 server to the to > >>> same time source of server A. > >> Your clients should all have at least 4 sources, so if you don't want them > >> to talk to the outside world, that means having at least that many > >> internal servers for them to reference. > >> > >> Terje > >> > >> -- > >> - <Terje.Mathisen at tmsw.no> > >> "almost all programming can be viewed as an exercise in caching" > >> -- > >> This is questions@lists.ntp.org > >> Subscribe: questions+subscr...@lists.ntp.org > >> Unsubscribe: questions+unsubscr...@lists.ntp.org > >> > >> > >> > >> > > -- > Harlan Stenn <st...@nwtime.org> > http://networktimefoundation.org - be a member! > -- > This is questions@lists.ntp.org > Subscribe: questions+subscr...@lists.ntp.org > Unsubscribe: questions+unsubscr...@lists.ntp.org > > > > -- This is questions@lists.ntp.org Subscribe: questions+subscr...@lists.ntp.org Unsubscribe: questions+unsubscr...@lists.ntp.org
