ntpd and security risk

Hi,

I have read in a book that unless you have very specific needs(and
your own GPS or atomic clock) running ntpd on your machine can be both
a waste of resource and security risk. for that reason some sysadmins
prefer ntpdate(often in a daily
cronjob) to set their system time via NTP

how valid is this claim ?
.

Relevant Pages

  • Re: System Clock Apparently Gaining One Second Every 30 Minutes
    ... Unless I want to buy my own "atomic clock". ... As in beeps over the wire, not counting NTP.* ... This one has feedback to measure the delay. ... Both of these should be free of GPS dependency. ...
    (comp.sys.mac.system)
  • Re: Accuracy of NTP - Advice Needed
    ... the entrance is next to a freeway. ... GPS is not used for this kind of thing, they are too inaccurate, so it ... you can't measure distance with an atomic clock. ...
    (comp.protocols.time.ntp)
  • Re: Accuracy of NTP - Advice Needed
    ... the entrance is next to a freeway. ... GPS is not used for this kind of thing, they are too inaccurate, so it ... you can't measure distance with an atomic clock. ...
    (comp.protocols.time.ntp)
  • Re: Turning on flat skis?
    ... I am moving at 88 feet per second, and the GPS doesn't ... UTC second and then adjusting the time estimate to minimize the multi- ... I doubt very much that you have an atomic clock on your yacht, ...
    (rec.skiing.alpine)
  • Re: A question concerning Einsteins elevator.
    ... all in vacuum free fall. ... GPS cesium and rubidium atomic clock frequencies can be ... enantiomorphic space groups would be opposite shoes. ...
    (sci.physics.research)