Monitor total data usage by Mac address
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I don't want to make bandwidth limiters. I want to be able to track total data usage for 2-3 months at least and do it by Mac address. Power cycling the router should not erase the data. Any way to do it?
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Use a switch port in monitor mode and send all your traffic to something designed to keep the statistics you want.
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NTop or NTopNG can give you these general stats for any devices connected through the firewall. You can install them in the Packages section.