OpenMarine
Traffic to CloudFlare - Printable Version

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Traffic to CloudFlare - pacman - 2022-07-05

I am running Openplotter on a Raspberry 4B connected to an onboard router with a SIM card for internet access.
Last month I had all the allowable traffic eaten from something on the boat (24 GB of traffic! Angry ).
I started to dig into the matter and finally discovered that is the Raspberry to consume that much traffic.
I have setup a traffic block rule on the router to avoid another total loss of data allowance and with nethogs checked carefully which connections were eating traffic.
I discovered a continuous traffic towards the CloudFlare servers, then created another firewall rule to block the traffic to the /16 network owned by CloudFlare.
Lastly I enabled and disabled this last rule to verify and actually when the rule is disabled the consumed data clock runs as hell.

Finally my question: what can I do to find the process/configuration/application that generates that traffic and stop it?
I am not a linux expert and on OpenPlotter I have installed no additional things besides the standard ones.
Since it is a continuous flow, it is also wasting cpu resources and I would like to get rid of it.

Any help will be much appreciated
Thanks in advance