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If the adapter is in monitor mode already, try without the

-I

Example:

phy#23
        Interface wlan23
                ifindex 30
                wdev 0x1700000001
                addr 1c:bf:ce:76:61:ac
                type monitor
                channel 6 (2437 MHz), width: 20 MHz, center1: 2437 MHz
                txpower 20.00 dBm


$ tshark -i wlan23 -I
Capturing on 'wlan23'
tshark: The capture session could not be initiated on capture device "wlan23" (That device doesn't support monitor mode).
Please check that you have the proper interface or pipe specified.
0 packets captured

Now without the argument:

$ tshark -i wlan23
Capturing on 'wlan23'
 ** (tshark:174492) 07:29:59.977737 [Main MESSAGE] -- Capture started.
 ** (tshark:174492) 07:29:59.977809 [Main MESSAGE] -- File: "/tmp/wireshark_wlan237C2SU1.pcapng"
    1 0.000000000 ExtremeN_12:8c:35 → HewlettP_fc:65:37 802.11 413 Probe Response, SN=3287, FN=0, Flags=........C, BI=100, SSID=TESTWIFI3

If the adapter is in monitor mode already, try without the

-I

Example: Example for an 8814au chipset, but 8812au with the aircrack-ng drivers behaves the same:

phy#23
        Interface wlan23
                ifindex 30
                wdev 0x1700000001
                addr 1c:bf:ce:76:61:ac
                type monitor
                channel 6 (2437 MHz), width: 20 MHz, center1: 2437 MHz
                txpower 20.00 dBm


$ tshark -i wlan23 -I
Capturing on 'wlan23'
tshark: The capture session could not be initiated on capture device "wlan23" (That device doesn't support monitor mode).
Please check that you have the proper interface or pipe specified.
0 packets captured

Now without the argument:

$ tshark -i wlan23
Capturing on 'wlan23'
 ** (tshark:174492) 07:29:59.977737 [Main MESSAGE] -- Capture started.
 ** (tshark:174492) 07:29:59.977809 [Main MESSAGE] -- File: "/tmp/wireshark_wlan237C2SU1.pcapng"
    1 0.000000000 ExtremeN_12:8c:35 → HewlettP_fc:65:37 802.11 413 Probe Response, SN=3287, FN=0, Flags=........C, BI=100, SSID=TESTWIFI3