Just in case someone find it's useful, there's a simple bash project with rrdtool to monitor bandwidth usage in Linux.
It's intended to monitor an Arris TG862 cable modem using the status page /cgi-bin/status_cgi.
It's very simple to use,
* Create the rrd data source
* Add a cron job to start the actual monitoring
* Use a command to generate a graph showing bandwidth usage anytime you want.
I wrote it and any comment or feedback will be welcome
https://github.com/mluis7/cable_modem_stats
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