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Re: [TEKNIK] ntp og sikkerhed



Frank Damgaard wrote:
On Tue, Feb 01, 2005 at 03:10:27PM +0000, Jørgen Heesche wrote:

Troels Arvin wrote:

Det skal i øvrigt tilføjes, at hverken ntpdate eller ntp-dæmonen
justerer hardware-uret, når man taler Linux og Intel-agtig hardware.
Hertil skal "hwclock --systohc" benyttes.


Jeg kører ntpd og kommandoen '/sbin/hwclock --show; date' viser nøjagtig det samme, f.eks.:
Tue 01 Feb 2005 15:08:09 UTC
Tue Feb 1 15:08:09 UTC 2005
Hvordan kan det være? Jeg justerer aldrig hardware-uret med hwclock, hvis ikke ntpd har gjort det, hvem har så?


måske hwclock kaldes ved opstart og nedluk ?
(i debian er der /etc/init.d/hwclock.sh )


Jeg har Mandrake 9.1, og motherboard Asus P4S533-E.
I /etc/init.d er der ingen hwclock.sh eller lign. locate hwclock finder heller ikke noget.


Men på http://www.fifi.org/doc/ntp-doc/html/ntpd.htm
fandt jeg dette:
Most operating systems and hardware of today incorporate a time-of-year (TOY) chip to maintain the time during periods when the power is off. When the machine is booted, the chip is used to initialize the operating system time. After the machine has synchronized to a NTP server, the operating system corrects the chip from time to time.


Hardware-uret bliver altså korrigeret af ntpd.


-- Med venlig hilsen

Jørgen Heesche
mailto:sslug@sslug



 
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