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is it possible to disable the ability to use 5Ghz for the wlan0 interface? I only want to use 2.4 Ghz Wifi Networks. So only 2.4Ghz Wifi is available and 5Ghz is disabled.

thanks in advance

Ephemeral
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Bierly
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    Why do you want to do this, do you have a valid reason? – Ephemeral Mar 10 '20 at 14:35
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    Because I maybe wan't to use the Raspi in a Product for the first devices to validate if it's worth develpoing it with own Hardware. And if 5Ghz is activated I also need to get 2.4 and 5 Ghz certified. So more like we use this first with Raspi as add-on and later it should be integrated in our Machine. – Bierly Mar 10 '20 at 15:06
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    ok, I don't know sorry. Maybe find your driver and use : modinfo -p driver_name for a specific module parameter which would allow you to do what you want. But I doubt, because the chip, in all cases, will support 5GHz band ? BCM43455 Preliminary Data Sheet, maybe for the moment use another rapsberry-pi version ? – Ephemeral Mar 10 '20 at 15:21

1 Answers1

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It is easy to select the frequencies you want to use. wpa_supplicant knows an option freq_list. Just add this line to your /etc/wpa_supplicant/wpa_supplicant.conf:

freq_list=2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467 2472

Then your WiFi will only connect to this frequencies. For some more information and other frequencies you can look at Raspberry pi 4 b 5Ghz wifi access point problem.

Ingo
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