There are no negative channel numbers.
According to the driver patch the expanded 2.4GHz channels start at channel 14 and end at channel 33
Running
$ sudo hcxdumptool -i interface -C
will give you an information of all available channels (hcxdumptool is able to set the channel and to get channel information via ioctl() system call)
Also you should be able to set the channel
$ sudo hcxdumptool -i interface -c channel
Tested this with channel 14, which seems to be a bug within the patch:
patch: CHAN2G(2407, 14), /* Channel 0 */
but 802.11 regular channel 14 frequency is 2484MHz
Now we try to set channel 14:
working as expected - no error.
example 2:
Now we try to set a channel that the device doesn't support:
According to the driver patch the expanded 2.4GHz channels start at channel 14 and end at channel 33
Code:
+ CHAN2G(2312, 33), /* Channel -19 */
+ CHAN2G(2317, 32), /* Channel -18 */
+ CHAN2G(2322, 31), /* Channel -17 */
+ CHAN2G(2327, 30), /* Channel -16 */
+ CHAN2G(2332, 29), /* Channel -15 */
+ CHAN2G(2337, 28), /* Channel -14 */
+ CHAN2G(2342, 27), /* Channel -13 */
+ CHAN2G(2347, 26), /* Channel -12 */
+ CHAN2G(2352, 25), /* Channel -11 */
+ CHAN2G(2357, 24), /* Channel -10 */
+ CHAN2G(2362, 23), /* Channel -9 */
+ CHAN2G(2367, 22), /* Channel -8 */
+ CHAN2G(2372, 21), /* Channel -7 */
+ CHAN2G(2377, 20), /* Channel -6 */
+ CHAN2G(2382, 19), /* Channel -5 */
+ CHAN2G(2387, 18), /* Channel -4 */
+ CHAN2G(2392, 17), /* Channel -3 */
+ CHAN2G(2397, 16), /* Channel -2 */
+ CHAN2G(2402, 15), /* Channel -1 */
+ CHAN2G(2407, 14), /* Channel 0 */
CHAN2G(2412, 0), /* Channel 1 */
CHAN2G(2417, 1), /* Channel 2 */
CHAN2G(2422, 2), /* Channel 3 */
Running
$ sudo hcxdumptool -i interface -C
will give you an information of all available channels (hcxdumptool is able to set the channel and to get channel information via ioctl() system call)
Also you should be able to set the channel
$ sudo hcxdumptool -i interface -c channel
Tested this with channel 14, which seems to be a bug within the patch:
patch: CHAN2G(2407, 14), /* Channel 0 */
but 802.11 regular channel 14 frequency is 2484MHz
Code:
$ sudo hcxdumptool -i wlp39s0f3u1u1u2 -C
initialization...
available channels:
1 / 2412MHz (20 dBm)
...
14 / 2484MHz (20 dBm)
Now we try to set channel 14:
Code:
$ sudo hcxdumptool -i wlp39s0f3u1u1u2 -c 14
initialization...
start capturing (stop with ctrl+c)
NMEA 0183 SENTENCE........: N/A
INTERFACE NAME............: wlp39s0f3u1u1u2
INTERFACE HARDWARE MAC....: f81a67077d0e
DRIVER....................: ath9k_htc
DRIVER VERSION............: 5.8.14-arch1-1
DRIVER FIRMWARE VERSION...: 1.4
...
example 2:
Code:
$ sudo hcxdumptool -i wlp39s0f3u1u1u2 -C
initialization...
available channels:
1 / 2412MHz (14 dBm)
...
165 / 5825MHz (17 dBm)
$ sudo hcxdumptool -i wlp39s0f3u1u1u2 -c 165
initialization...
start capturing (stop with ctrl+c)
NMEA 0183 SENTENCE........: N/A
INTERFACE NAME............: wlp39s0f3u1u1u2
INTERFACE HARDWARE MAC....: 503eaa92e326
DRIVER....................: mt76x0u
DRIVER VERSION............: 5.8.14-arch1-1
DRIVER FIRMWARE VERSION...: N/A
Now we try to set a channel that the device doesn't support:
Code:
$ sudo hcxdumptool -i wlp39s0f3u1u1u2 -c 166
initialization...
channel 166 is not available
terminating...