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I just got a new router that supports 2.5 Ghz and 5 Ghz. I see my pi now has a wlan1 as well as wlan0. Looks like wlan0 is on the 2.5 Ghz band and wlan1 is on the 5 Ghz band. Both interfaces seem to work ok.

Is this normal/ok?

  • Add the output of iwconfig to your question; edit out the ESSID for privacy – Milliways Jun 27 '18 at 3:14
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Yes, it is OK. All raspis with wifi, except Raspberry Pi 3 B+, can only use the 2,5 GHz band due to limit by the onboard wifi chip. Your USB wifi dongle supports the 5 GHz band. By default the wifi driver wpa_supplicant selects the 5 GHz band if available and if it has at least the same strength than the 2,5 GHz band. In /etc/wpa_supplicant/wpa_supplicant.conf you can configure what association to use. Your router spawns two wifi connections, one for 2,5 GHz and one for 5 GHz, each with a separate mac address. You can scan your wifi network and look what mac address is used with:

rpi ~$ sudo iw dev wlan0 scan

You can also use wlan1, it dosn't matter in this case. You will find lines for example:

BSS 34:81:c4:fc:71:ab(on wlan0)

Look at the SSID what association it belongs to. Select the mac address from your router you want to connect and add a line with bssid= to /etc/wpa_supplicant/wpa_supplicant.conf, for example from my raspi:

country=DE
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="wlan@hoeft-online.de"
    bssid=34:81:c4:fc:71:ab
    psk="verySecretPassword"
}

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