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  • Thanks for your reply. I will try it again tomorrow with ap_isolate and try different settings with it. What do you mean with "Forget ARP family?" Isn´t this the exact usecase for this table? Just to be clear: I want to be able to filter ARP while still using the Pi as a routed access point. I tried the different approaches just to check if they would work. Commented Jul 27, 2021 at 20:07
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    I realize just now you are routing, so I might not have given you correct information sorry (here's the link I put before if you need it: superuser.com/questions/1661060/… , but I'm not sure at all you need it now). Commented Jul 27, 2021 at 20:16
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    The key is ap_isolate, it's just that the feature seems to require support from the driver/firmware of the wireless NIC. Commented Jul 28, 2021 at 8:02
  • Yes, ap_isolate should theoretically work. As you said @Tom Yan the problem could be with the BCM43455 chip of the Pi 3 B+. Another user had a similar problem: raspberrypi.org/forums/viewtopic.php?t=175082. I will try again with an USB dongle with a RT5370 chip as soon as I can get a hold of one (I can only get a dongle with RT5372 which was recommended if I would import it and I don´t want to). Commented Jul 28, 2021 at 16:31