On 2010-05-31, Richard B. Gilbert <rgilber...@comcast.net> wrote: > unruh wrote: >> On 2010-05-30, Richard B. Gilbert <rgilber...@comcast.net> wrote: >>> bombjack wrote: >>>> Hi, >>>> I am fairly new to the ntp arena, but have to learn fast as part of my >>>> work is trying to fix ntp problems. Lately I had a customer that >>>> complained that there servers went bananas due to time being wrong. >>>> (The customer claims that ntp had changed the time 20 years ahead). >>> That is somewhere between highly improbable and impossible! NTPD had to >>> have some human "help" to do that. >>> >>>> Looking at some wire shark logs it seems that sys.peer for some reason >>>> had turned into a stratum 16 server (i.e. unsynched) and had "leap" >>>> set to 3 -"Alarm condition (clock not synchronized" >>>> >>>> the setup: klient syncs to 2 servers, one stratum 1 (sys.peer) and one >>>> stratum 2 server. If sys.peer all of a sudden says it's a stratum 16 >>>> server, how does ntp react to this? instant outvote of the sys.peer? >>>> or are these packets filtered for some time as being errornous? or >>>> anything else? >>> With only two servers nobody can outvote anybody else!! Is it not >>> written that a man with two clocks can never be certain what time it is? >> >> But if one clock tells you that it itself is completly nuts, it is not >> hard to tell which the right one is. >> >> If you ask me and my friend what time it is, and he says it is 12 noone, >> and I say it is 5PM, but my watch is broken, is it hard for you to >> figure out what the time is? > > Yup! In that situation "noon" is just a wild ass guess!
No it is not. It is the best estimate of the true time you have. > > _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
