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Re: ntp/ntpdate and NAT
On Tue, Jun 04, 2013 at 03:05:21PM +0200, tlaronde%polynum.com@localhost wrote:
> The question arised because I have bad values (more than 2 seconds
> offset) for a node on which I have made a "ntpdate -b" (so no adjtime) a
> day before: the (new, dual-core x86_64, NetBSD 6.1) PC clock is not an
> atomic clock, but when the system is running it does not shift by
> several seconds a day, or is it?
If your NAT device causes persistent enough packet handling delays in the
order of 2 seconds (or enough to make NTP erroneously drift that far),
you have a serious problem.
I have a few machines behind a NAT that sync very well with an external
NTP server, typical ntpdc -s looks like:
remote local st poll reach delay offset disp
XXXXXXXXXXXXXXXX xxxxxxxxxxxxx 3 1024 377 0.04420 0.006242 0.13820
What timecounter source did your machine pick and what other choices do you
should tell you.
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