Impact of ARP lookup on local NTP traffic

Hal Murray hmurray at megapathdsl.net
Tue May 31 06:46:52 UTC 2016


gem at rellim.com said:
>> > Changing minpoll fixes all OS, and keeps the change local to avoid
>> > unintended consequences.
>> Only if they have a timeout in the right range.
> Oh, it is in the right range.  Linux by default has a gc_timeout of 60
> seconds.  Anytime after that Linux may delete the ARP entry. 

I meant only if the other OSes have the right timeout.

If they have a 30 second timeout, your maxpoll of 5 won't work.


gem at rellim.com said:
> Maybe ntpd is reseting the kernel PLL to center on restart, instead of
> leaving it at its current setting? 

I think it's worse than that.  I think it's using the time from the first 
response.



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