connmon connmon v3.0.8 [2025-Nov-16] - Internet Connection Monitoring Tool for AsusWRT Merlin

[penguin22]

Appreciate the add for notifications. One question that may just be on my end, however when looking at the charts/data, I see a periodic spike in ping and jitter that doesn't show when performing a comparable test from a client connected on the network. Is this expected or explainable or something that warrants some digging to identify underlying cause:

 

[Ripshod]

Two per hour? Do you use spdMerlin?

 

[Tarek Yag]

Two per hour? Do you use spdMerlin?

I guess you pin-pointed the issue here with a great spot-on notice. I had it once upon a time when I was in the very early days of using both connmon and spdMelrin together.

I used, and always make sure, not to allow any scheduled cron job to run at the same time with any other job (especially connection related). Nowadays, I have 12 cron jobs and there is not a single job gets run with another at the same time. This keeps my ancient router always able to keep up with all the load.

 

[penguin22]

Two per hour? Do you use spdMerlin?

Yes, I do indeed. That was a quick find and in the case they are both running, it never exceeds 40ms, so I just changed the threshold for alerting, along with adjusting the time they run to avoid overlap, similar to what @Tarek Yag indicated.

I am using the built-in speedtest as well, though wonder if there would be a difference running the external test instead. For now, since spdMerlin is set to run every 12 & 42 minutes, I adjusted conmon to every 5 minutes, which (in theory) will prevent them from overlapping.

 

[Tarek Yag]

so I just changed the threshold for alerting

It's up to you to decide on the threshold for alerting, but now that connmon and spdMerlin cron jobs are no longer overlapping, you don't need to take it into consideration anymore, just keep your average internet usage into account for the threshold.

which (in theory) will prevent them from overlapping.

They should not overlap anymore, in theory and in practice, as I believe no speed test takes more than 1 minute. Speedtest's algorithm is super optimal from what I experienced through the years.

I am using the built-in speedtest as well, though wonder if there would be a difference running the external test instead.

I once answered this doubt, which I had for a long time too. People always wonder the same thing!

https://www.snbforums.com/threads/spdmerlin-v4-4-16-2025-nov-16-internet-speedtest-and-monitoring-tool-for-asuswrt-merlin.94829/post-959033

 

[penguin22]

I once answered this doubt, which I had for a long time too. People always wonder the same thing!

https://www.snbforums.com/threads/spdmerlin-v4-4-16-2025-nov-16-internet-speedtest-and-monitoring-tool-for-asuswrt-merlin.94829/post-959033

The way I read that, use the external to ensure it is the most current. Interesting to me, and likely others, as the way it is written in the configuration page almost makes it sound like a completely different binary rather than the same speedtest at just a different version:

Speedtest binary to use
(either built-in Ookla or speedtest-cli)