[ntp:questions] NTP request retry?

Rob nomail at example.com
Tue Jan 28 09:01:21 UTC 2014


A C <agcarver+ntp at acarver.net> wrote:
> On 1/27/2014 13:45, Rob wrote:
>> Rick Jones <rick.jones2 at hp.com> wrote:
>>> Brian Inglis <Brian.Inglis at systematicsw.ab.ca> wrote:
>>>
>>>> You don't specify which system and devices you are using,
>>>> so here are a couple of articles about changing ARP timeouts:
>>>> http://www.embeddedsystemtesting.com/2013/01/arp-timeout-value-for-linux-windows.html
>>>> http://support.microsoft.com/kb/949589
>>>
>>> And if indeed these are all the OP's own systems, he can add
>>> hardwired, "permanent" ARP cache entries via the arp command (under
>>> most *nixes at least).
>> 
>> I'm still not sure if ARP is really the problem, but fixing the
>> clients to maxpoll 6 seems to cure it.
>> (at least the reach now sticks at 377)
>> 
>>> If a mix of wired and wireless is involved, if there is some way to get
>>> traces at the point where the two join that would be goodness.
>> 
>> If both would be WiFi, I would point at the WiFi.  However, one is
>> connected to the wired network (a switch where the server is connected
>> as well).
>> 
>> I can ping it as much as I like, no loss:
>> 1571 packets transmitted, 1571 received, 0% packet loss, time 20468ms
>> rtt min/avg/max/mdev = 0.702/0.845/1.168/0.090 ms
>> 
>> But when ntpd is allowed to climb to 1024-second polls, it gets almost
>> no replies.
>
> Power control on the WiFi device?  Perhaps something is causing the
> wireless card to shift to a low power sleep mode when there's no network
> traffic?

And why does it affect the wired client as well?



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