[ntp:questions] ntpq -p command query
BP00106533 at TechMahindra.com
Wed Jul 31 07:26:08 UTC 2013
Basically my intention is to get notification in client when ever the connection between server changes(Ex-lan connectivity OR ntp server itself is down).For that I am doing the following step:
1.Execute ntpq -c associations
2.Get the data in status field
3.If there is any change in that field ,then collect the 4th bit of that.(Ex:f69a & 1000)
4.If its 1 then reachable else unreachable.
But the problem I am facing is:
Whenever the connectivity between the server goes down, the status field will not change immediately.
My observation was whenever the reach field of ntpq -p command comes to zero then only the status field changes.
That's why I was trying to reduce the time gap.
If My approach is not correct then please suggest me the other approach.
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From: questions-bounces+bp00106533=techmahindra.com at lists.ntp.org [mailto:questions-bounces+bp00106533=techmahindra.com at lists.ntp.org] On Behalf Of David Taylor
Sent: Wednesday, July 31, 2013 12:46 AM
To: questions at lists.ntp.org
Subject: Re: [ntp:questions] ntpq -p command query
On 30/07/2013 15:24, Biswajit Panigrahi wrote:
> I have configured the ntp server and ntp client on two machine.
> Both are communicating properly. I would like to test when the
> connectivity between those two goes down, after how much time the
> "reach" option in ntpq -p command becomes zero.
> For that I stopped the ntp server and I executed the ntpq -p in
> client's console,
> The reach option will still keep on increase to 377 then gradually
> decreases to zero. The time duration to come to zero is almost 20
> Can we reduce the time gap ?
Look for a value not equal to 377, rather than 0. Possibly 376 would be
the first indication of a problem.
20 minutes (actually 1024 seconds) is the polling interval which will be
reached in a stable default configuration, so as others have said,
reduce the value of maxpoll for servers which are local to your network
(i.e. not public servers). On my own network, I typically have maxpoll
set to 5 for local servers, and minpoll set to 10 for Internet servers.
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