[EMAIL PROTECTED] (Manuel Beicht) writes: >Hi!
>I have some questions regarding synchronization and the output of "ntpq -p". >For example what is the significance of the "*" for example when you run ntpq >-p. Is this star a must because I have seen the polling sometimes and the time >mostly accurate but the "*" is missing. So does the server have to have a "*" >to be synched? In ntp documentation I read it just means that "*" denotes the >server that the NTP client is synching to but not necessarily that they are IN >synch. I am asking so far I considered any server without a "*" out of synch. Yes, * means it is the selected source. that ntp will slowly try to sync to. >Then I noticed the polling is dynamic but it seems to be too long with some >intervals and in particular too long when there is an offset. For example if >we have an offset of 1000 the polling is at 128 or at 256 instead of 64 or a If you have an offset of 1000 ntp will carry out a step when it decides that that is a genuine (ie, that the minimum offset recorded during 8 polling intervals) offset. If you have an offset of 1000 something is very wrong with your network connection or your system. >lower level which I think would be more logical. There are actually some posts >on the ntp support sites that mention using custom polling parameters based on >the offset and latency ect...that do polling at 10 min 15 max and there is >some type of algorithm to find a match for anyone site. It is slow to decrease the poll interval. >Also what is acceptable offset and jitter? We currently experience 20-40ms >offset and 20-30ms jitter. sometimes it is up to 100-120ms offset. That is unusual. What kind of network connection do you have? A telephone modem connection? For a high speed connection, the usual offset is in the 10s of microsecond range for a local server, and 100s of microseconds for a relatively local machine. Even half way across the continent with a delay of 45ms, the offset is 100s of microseconds. >Is that still ok? What is the acceptable range usually? >I would be very glad if you could provide me with some help. >thanks >Manuel >-- >Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! >Ideal f|r Modem und ISDN: http://www.gmx.net/de/go/smartsurfer _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
