[ntp:questions] ntpdate

Riccardo Castellani castellani.riccardo at tiscali.it
Wed Mar 28 21:03:51 UTC 2007

I think time offset is very little at every each cron interval; "-B" option uses "adjtime" system call which is more soft function to adjust time. (it slowly steers pc clock)
What do you think ?
I thought to use ntpdate so in this way I have no installed service, CPU load is more free and thare are no attacks risk from other machines.
  ----- Original Message ----- 
  From: Eric 
  Newsgroups: comp.protocols.time.ntp
  To: questions at lists.ntp.isc.org 
  Sent: Wednesday, March 28, 2007 8:23 PM
  Subject: Re: [ntp:questions] ntpdate

  Well, using ntpdate will always "step" your PC clock, so you can count on it jerking
  forward and back at each chron interval.  So I'm not sure how it would help to always
  use the same server, it will still hop around even from one server.  And, ntpdate I
  believe has been "deprecated" and is no longer being enhanced or supported.

  What you really want is somehow to reach out to several servers, get an approximation
  of the correct time by consensus, then slowly steer the PC clock to match it.  No
  steps, no dependency on a particular server.  

  This is what the reference implementation of NTP does.  It's called NTPD.  I'd give
  that a try.

  - Eric

  On 28 Mar 2007 02:50:11 -0700, "RICCARDO" <castellani.riccardo at tiscali.it> wrote for
  the entire planet to see:

  >I use ntpdate command in crond to synchronize local clock of my Linux
  >I run ntpdate -B -s ntp1.ien.it ntp2.ien.it
  >1- NTP algorithm will choose best time, so is't possible client
  >retrieves time from ntp1 server or ntp2 ? Can you confirm me this
  >behaviour ?
  >2- Does it exist way to retrieve time ALWAYS from same server (for
  >example ntp1) and only if it is not available gets time from second
  >server (ntp2) ?

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