I'm not exactly sure if he really did hide or changed his MAC address, because I have full confidence he doesn't know both of those things.
Also this is my ISP's Modem/Router panel, where it should show every devices connected and displays the MAC address. And the problem is that, if I don't disable his MAC address like presently now that he uses a ethernet cable, it won't show up from the list of devices connected, so I won't be able to get the source or rates of how much packets is being consumed from his laptop.
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And this is the interface of listing the allowed and disabled devices through MAC
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And currently I was thinking if it is possible to block him by knowing his IP address, which I've been trying to find a way like a couple of hours ago, like if it was possible to determine an IP address just from a MAC address.
Anyways I've never used this menu yet, but it has something about IPs, which I assumed, maybe I could block him using his current IP, which I don't have any clue.
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Thank you for the help though!