[ntp:questions] ntpd, boot time, and hot plugging
brad at stop.mail-abuse.org
Thu Feb 3 00:52:52 UTC 2005
At 11:55 PM +0000 2005-02-02, Per Hedeland wrote:
> No, *that's* not true. Ntpdate sends four queries to each of the servers
> given on the commandline, and applies "some" filtering to the results in
> order to choose the "best" correction to the local clock.
But how many people actually use ntpdate to check more than one
upstream? I know plenty of OS configurations where you are only
allowed to provide a single host name or IP address.
It's not a matter of what ntpdate is capable of, if used in the
correct way. It's a matter of the way in which ntpdate is typically
With ntpd, we've got a configuration file, and we can help ensure
that people are less likely to be able to use it in a stupid way.
>> With ntpd, you can at least require some sort of authentication
>>key before you believe the server.
> This diatribe is so far removed from reality that it doesn't really
> deserve comment - let it be enough to note that ntpdate does support
> "some sort of authentication", in case anyone wants to use it.
Again, it's not a matter of what ntpdate can potentially do, it's
a matter of what you can require that the program *will* do, based on
the configuration file.
Combine the configuration file with the improved algorithms in
ntpd, and there's no comparison.
Brad Knowles, <brad at stop.mail-abuse.org>
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
-- Benjamin Franklin (1706-1790), reply of the Pennsylvania
Assembly to the Governor, November 11, 1755
SAGE member since 1995. See <http://www.sage.org/> for more info.
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