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I am trying to change wifi channel to one that will use 5GHz frequency.

iwconfig

lo        no wireless extensions.

wlo1      IEEE 802.11abg  ESSID:off/any  
          Mode:Managed  Frequency:5.2 GHz  Access Point: Not-Associated   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

eno1      no wireless extensions.

Once I connect to my Wifi, frequency is switched to 2.4GHz

lo        no wireless extensions.

wlo1      IEEE 802.11abg  ESSID:"PiotryStephy"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: C0:05:C2:BF:6F:79   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

eno1      no wireless extensions.

In my router settings there are both 2 and 5GHz frequencies allowed. There is no option to change "Mode:Managed".

These are my available channels:

iwlist channel
lo        no frequency information.

wlo1      29 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz
          Channel 36 : 5.18 GHz
          Channel 38 : 5.19 GHz
          Channel 40 : 5.2 GHz
          Channel 42 : 5.21 GHz
          Channel 44 : 5.22 GHz
          Channel 46 : 5.23 GHz
          Channel 48 : 5.24 GHz
          Channel 52 : 5.26 GHz
          Channel 56 : 5.28 GHz
          Channel 60 : 5.3 GHz
          Channel 64 : 5.32 GHz
          Channel 149 : 5.745 GHz
          Channel 153 : 5.765 GHz
          Channel 157 : 5.785 GHz
          Channel 161 : 5.805 GHz
          Channel 165 : 5.825 GHz
          Current Frequency:2.412 GHz (Channel 1)

eno1      no frequency information.

When I am trying to change a channel:

sudo iwconfig wlo1 channel 40
Error for wireless request "Set Frequency" (8B04) :
    SET failed on device wlo1 ; Operation not supported.
bombelsky
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    In `iwconfig`, it says "Mode:Managed." In that case, the router or other access point sets (manages) the channel, not the user. I suggest that you change the router to a fixed channel: 40. – chili555 Oct 16 '17 at 21:04
  • Thanks for your reply. I changed to a fixed channel but it still connects only to a channels representing 2GHz frequencies. I can not disable this frequencies in router, because other user do not support 5GHz frequencies... – bombelsky Oct 17 '17 at 16:02
  • Can you assign a different SSID to the 5gHz segment; for instance, myrouter5 and the 2.4 gHz segment named myrouter24? That's the technique I use on both of my wireless routers. – chili555 Oct 17 '17 at 16:33
  • I tried doing this. And 5GHz is not recognized. Possible drivers issues of my `08:00.0 Network controller: Broadcom Corporation BCM43142 802.11b/g/n (rev 01)` – bombelsky Oct 17 '17 at 17:23
  • Not likely as the 5 gHz channels are recognized in `iwlist channel`. Did you try rebooting both the router and the computer? Is the 5 gHz segment set to fixed channel 40? – chili555 Oct 17 '17 at 19:04
  • Yes, I tried rebooting. It is set to 40, but I tried manual mode with other channels and also with auto mode. – bombelsky Oct 18 '17 at 16:49
  • When the router is set to channel 40, does your Broadcom simply not see it? Does it appear in `sudo iwlist scan`? – chili555 Oct 18 '17 at 21:02
  • Thanks for following this topic. It does not appear. There are no channels higher than 11 – bombelsky Oct 18 '17 at 21:34
  • Please see: https://h30434.www3.hp.com/t5/Notebook-Wireless-and-Networking/Broadcom-BCM43142-802-11-bgn-Wi-Fi-M-2-Adapter-to-5Ghz/td-p/6085221 Is it possible that only one wire is connected? Does the 5 gHz segment appear if you scan right next to the router? – chili555 Oct 18 '17 at 22:21
  • Thank U. Distance from a router does not affect visibility of 5GHz networks. Might be a hardware problem indeed... – bombelsky Oct 20 '17 at 17:01

2 Answers2

4

Interface has to be in monitor mode. First bring it down with ifconfig wlo1 down Then change it with iwconfig wlo1 mode monitor Bring it back up ifconfig wlo1 up Change channel iwconfig wlo1 channel 40

SouthernCowboy
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Sometimes changing channel will be on auto mode therefore these command won't helpful because it changes to 5GHz or 2.4GHz automatically iwlist channel shows which channel to select.

iwconfig wlp2so freq 2.4G
iwconfig wlp2so channel 44

You need to make changes on wireless router and set manual channel select. See the image below

Wireless settings on Router

Kulfy
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Muhammad Shakeeb
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