[atlas] some thoughts and question regrding probe "stability"

For what it's worth, I've seen similar trouble over the last couple days.
I've only had my probe hooked up since the 2nd of July, and compared to
some of you it's a pretty basic local network. Unfortunately the 2 times
it's gone down have been two hours before our store opens for the day so I
haven't been here to see what's up. Of course it's very possible that
something on our end is just going down and I don't know about it, so I'll
keep an eye on it.

 *Ross Weseloh*


On Thu, Jul 17, 2014 at 8:03 AM, Aftab A. Siddiqui <aftabs at cyber.net.pk>
wrote:

> Hi Wilfred,
> Atleast your probes were online for many number of days. Here is the
> availability report of my V1 probe 0303. 99.71% Availability.
>
> +---------------------+---------------------+------------+--------------+
> | Connected (UTC)     | Disconnected (UTC)  | Connected  | Disconnected |
> |---------------------+---------------------+------------+--------------+
> | 2014-05-29 23:46:12 | 2014-06-02 06:30:06 |   1d 06:30 |     0d 00:00 |
> | 2014-06-02 06:40:35 | 2014-06-03 06:52:14 |   1d 00:11 |     0d 00:10 |
> | 2014-06-03 06:59:53 | 2014-06-04 22:11:56 |   1d 15:12 |     0d 00:07 |
> | 2014-06-04 22:22:43 | 2014-06-16 15:48:25 |  11d 17:25 |     0d 00:10 |
> | 2014-06-16 15:59:17 | 2014-06-17 22:11:24 |   1d 06:12 |     0d 00:10 |
> | 2014-06-17 22:22:53 | 2014-06-21 21:13:51 |   3d 22:50 |     0d 00:11 |
> | 2014-06-21 21:41:35 | 2014-06-23 15:44:56 |   1d 18:03 |     0d 00:27 |
> | 2014-06-23 15:54:55 | 2014-06-29 04:19:02 |   5d 12:24 |     0d 00:09 |
> | 2014-06-29 04:53:22 | Still up            |   1d 19:06 |     0d 00:34 |
> +---------------------+---------------------+------------+--------------+
>
> It is directly connected to our core router. I was never able to correlate
> any of the disconnection times with any network incident.
>
> Best Wishes,
>
> Aftab A. Siddiqui
>
>
> -----Original Message-----
> From: ripe-atlas-bounces at ripe.net [mailto:ripe-atlas-bounces at ripe.net] On
> Behalf Of Wilfried Woeber
> Sent: Thursday, July 17, 2014 5:49 PM
> To: ripe-atlas at ripe.net
> Subject: [atlas] some thoughts and question regrding probe "stability"
>
>
> Hi Folks,
>
> triggered by the discussion related to DNSMON, and an issue (power,
> resolved) with one of my V1 probes, I'd like to get some input or start a
> disussion or an investigation.
>
> To start with, I am not very clear what the term "stability" w/should mean
> in this context, as the probes are supposed to buffer measurment data
> locally, at least for a while (true?).
>
> So, here goes...
>
> Obviously, looking at some Atlas Stat pages, there are probes with a 100%
> uptime.
>
> Now, looking a the 3 under my supervision (2x V1, 1 Anchor), ref
> "Connected"
> and "Disconnected", there's no chance to get near that value, as all of
> them
> tend to topple over on a regular basis, mostly for a *short* period of time
> in the range of 0m(!) to some 30+m.
>
> With respct to the bahaviour of the Anchor, which is mounted in the same
> rack as the backbone router it connects to, in a Data Center, we tried to
> correlate the (reported) disconnection events with the router and interface
> logs for the probe. No luck there, also, no maint works or the like, so I
> presume the Anchor didn't reboot or that there were "real" network
> problems.
>
> Let's compare the most recent dis/connection logs for my 3 pets:
>
> ID 6009
> 2014-07-14 03:58:03     3d 8h 16m        Still Connected
> 2014-05-27 03:03:54     48d 0h 46m       2014-07-14 03:50:47    0h 7m
> 2014-05-20 15:19:02     6d 11h 37m       2014-05-27 02:57:00    0h 6m
> 2014-05-14 21:16:56     5d 17h 59m       2014-05-20 15:16:22    0h 2m
> 2014-04-08 16:03:21     36d 5h 1m        2014-05-14 21:05:17    0h 11m
>
> ID 0466
> 2014-07-13 23:31:05     3d 12h 45m       Still Connected
> 2014-07-09 23:05:40     3d 23h 54m       2014-07-13 22:59:49    0h 31m
> 2014-06-16 10:53:21     23d 11h 55m      2014-07-09 22:49:04    0h 16m
> 2014-05-25 09:03:06     22d 1h 38m       2014-06-16 10:42:00    0h 11m
> 2014-05-24 20:34:50     11h 54m          2014-05-25 08:29:12    0h 33m
>
> ID 0414
> 2014-07-07 23:41:23     9d 12h 35m       Still Connected
> 2014-07-02 03:58:45     5d 19h 31m       2014-07-07 23:29:54    0h 11m
> 2014-06-13 09:37:50     18d 18h 7m       2014-07-02 03:45:08    0h 13m
> 2014-06-08 13:22:14     4d 20h 7m        2014-06-13 09:29:38    0h 8m
> 2014-05-21 08:29:23     18d 4h 45m       2014-06-08 13:15:11    0h 7m
>
> Again, I fail to see some obvious correlation, what am I missing?
>
> Does anyone else see a similar pattern?
>
> How to start debugging, if there's anythig that needs debugging?
>
> Thanks for your ideas and help!
> Wilfried
>
>
>
>
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