[ntp:questions] NTP request retry?

Rob nomail at example.com
Mon Jan 27 19:33:12 UTC 2014

Charles Swiger <cswiger at mac.com> wrote:
> Hi--
> On Jan 27, 2014, at 10:10 AM, Rob <nomail at example.com> wrote:
>> Despite lots of tracing I still cannot really pinpoint the problem.
>> The only thing I see is that ping has absolutely zero loss and all
>> usual protocols work fine, but ntp indicates a high loss when there
>> is no other network activity.
>> When the network is kept busy, ntp works fine as well.
>> Very strange.
> That's odd.  Are the NTP servers and your client subnet-local or remote?

It is a local network.
One client is wired (100Mbit ethernet) and the other is WiFi.

> If they're remote, then ARP probably isn't involved unless you're having
> issues finding your default gateway.  Set up an /etc/ethers entry [1] for it,
> or for your subnet-local NTP servers if you have them around, and see whether
> it makes a difference.
> Otherwise, tcpdump/wireshark/etc captures should be informative.

Unfortunately they have not been so far.
Logs on the client show a request with no reply, logs on the server
show no request coming in.  It is unclear to me if an outgoing request
would be shown on the trace when ARP resolution is incomplete.

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