Strange WWAN data usage every day at midnight? RUTX11

On 2024-09-20, I started noticing that one of my RUTX11 devices (firmware 7.09.1) started displaying a large spike in data usage every day at exactly midnight. I confirm that I am seeing this usage on the carrier’s portal as well, and they just billed me for a 3GB “top up” due to this.

Data usage from device itself:

Carrier portal:

IPv6 is disabled on this device, and I did not have any outages on the primary wired WAN connection during this time (I monitor it externally). I checked the failover rules (screenshot below) and they are the same as all the other devices I manage. Can’t figure out why this would suddenly be happening.

Uptime on the device is 12 days +

Failover setup

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Just an update, the mysterious data usage has continued. I cannot figure out what is causing it. Anyone got any suggestions?

Appears that there’s another user facing a similar, if not identical, issue: RUTX11 consumes mobile data despite Wifi priority (failover)

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Yes, I have the same problem! Thanks for observing and linking this!

Hopefully, the Teltonika team can help us.

Dear Teltonika Team,

The problem still persists. Maybe you could provide some more guidance how to set it up correctly. Thank you so much!

Hi luckman212,

We are currently looking into this. Please wait for any updates regarding this issue.

Regards,

@Janmiguel Thank you. Let me know if you want a troubleshoot file from this device etc.

I checked again today, and I saw that the mystery data usage is gone. I had updated to 7.09.3 just around 2 days ago. So I do think that this was a bug in 7.09.1 maybe.

I am still keeping a close eye on it.

Hi,

That is good to know. I also tested on 7.09.3 and observed zero to minimal mobile interface traffic while it acts a a back up WAN source. Let me know if any issues persists.

Regards,

@Janmiguel
My router is already on the latest available FW (RUTX_R_00.07.09.3) for several days.

Interestingly, there is a ditch on 29 Sep 2024:

However, the same information in another (status) screen looks differently, i.e. no ditch shown on 29 Sep 2024:

How comes that the “SIM1/Mobile Usage” shows different values compared to “Status/mob1s1a1 traffic”?

@Marija In the past 2 days I have sent several emails to community-networks@teltonika.lt with notes and some attachments about this issue (as instructed)

I just want to make sure they were received?

(reference # used was 9204 which refers to the other thread)