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NTP

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KE2N
KE2N's picture
NTP

In trying to test the use of a private mesh-connected NTP server, I find am unable to get my node to access the other users IP address from the node where I am running a tunnel client and tunnel server. The NTP server's address is reachable from the other nodes on my mesh, as well as a laptop plugged into the tunnel server node, but not from the OS of the router running the tunnel software.  I tried 3.1.15 and 3.1.16b01.

Also: Suggestion for the NTP feature introduced 3.1.16 - when the user types in an address and hits the save button, try to ping that address and report whether or not it is reachable.  It may be that it is not reachable in the environment where the data is being entered, so this is just advice, not a show-stopper.  But if the address is no good and it is supposed to be good, that would be useful information.


Ken


 

AE6XE
AE6XE's picture
Ken,  thanks for the input.

Ken,  thanks for the input.  We'll discuss in next Dev team meeting (weekly) to determine next step.

kj6dzb
kj6dzb's picture
I have a local GPS pps NTP

I have a local GPS pps NTP server, I use 1 geographically local reference to compare my GPS pps too and another to compare the result of that too. The 2 geographic servers tend to drift in regards to offset, delay and jitter thru out the week... so bad my pps takes over.  

I bring this up in hopes that a user can set at least 2 serves to poll and have something to click to Sync the clock, and then get a pop up window or DIALOG confirming the server is reachable and the node is synced. 

 

KG6JEI
Accuracy of the NTP source

Accuracy of the NTP source really should be handled at the source. Possible methods include using a NTP server in front of the sources to combine and compare them.

Honestly though it sounds like a lot more work to me than its worth however considering that mesh nodes are NOT TIME CRITICAL devices, even if you had an accurate to the picosecond time server the nodes are not going to need time that accurate, are probably not even that accurate internally, and just network latency alone could throw that accuracy out the window.

The nodes are not Visa/Mastercard transaction servers, they are routers, microsecond accuracy for internal systems usage (graphs) really isn't critical on them for the locations they will be deployed to.
 

kj6dzb
kj6dzb's picture
Ntpd is designed to query a

Ntpd is designed to query a pool of servers. If the GUI would alow multiple ntp servers... so I don't have to go and add them to the config my self. I presented a level of accuracy that not everyone may want to maintain. I would want the nodes to compare to at least 2 sources, what ever they might be. Every default install I've seen of ntpd on  Linux has a pool of 4 to compare too.  Those don't even cut it for jt65. One or 2 seconds +/- is not OK for me, when the default pool drifts.

I ran in to the problem back when I got my first rpi and wanted to script cron jobs, on a pi that wasn't connected to the internet. So I've been using GPS and now pps to sync.

Thanks for the ntp feature!

KU7PDX
KU7PDX's picture
I wanted to add to this

I wanted to add to this thread and find out to what extent there is NTP support in the AREDN firmware?

More than likely our nodes won't typically have internet access, so I plan on setting up a dedicated NTP server on my AREDN node. What is the proper configuration to make sure nodes throughout the mesh are able to get the latest time from my NTP server? Will it just be automatic?

K5DLQ
K5DLQ's picture
bottom of the setup page: 

bottom of the setup page:  add your ntp server.

K0SPN
Can someone tell me where the

Can someone tell me where the config file is so I can manually add a second server?
Tried searching a bit and didn't see any likely suspects.

Cheers.

nc8q
nc8q's picture
manually add a second NTP server?

Nope.

You can add a local NTP server (ex. RPi) and configure its ntp.conf with multiple NTP servers.

 Chuck
 

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