On Tue, Sep 29, 2020 at 3:07 PM Samuel Sieb <samuel@sieb.net> wrote:
On 9/29/20 10:33 AM, Fulko Hew wrote:

> No, no other thread. In the original email I used iw command to turn 

> manage off.

> 

> wlp2s0f0u4  wifi      unmanaged  --

> 

> wlp2s0f0u4  unassociated  ESSID:""  Nickname:"<WIFI@REALTEK>"

>            Mode:Managed  Frequency=2.412 GHz  Access Point: Not-Associated

> 

> So now nmcli says it's unmanaged but iwconfig says it IS managed.

Ok, that is a little confusing.  The nmcli "managed" means that 

NetworkManger is handling the device.  The iwconfig "managed" is 

referring to the mode that the wifi device is in.

> So I also tried both of the following to enable monitor:

> 

> [root@localhost fhew]# iw wlp2s0f0u4 set monitor none

> command failed: No such device (-19)

That can't be the actual command you ran, because it's not valid. 

You're missing a "dev".

I hear what you're saying, and yes, the man page says you should have a 'dev' in there,
 but that doesn't make any difference"

[root@localhost fhew]# iw dev wlp2s0f0u4 set monitor none

command failed: No such device (-19)

> [root@localhost fhew]# iwconfig wlp2s0f0u4 mode monitor

> Error for wireless request "Set Mode" (8B06) :

>      SET failed on device wlp2s0f0u4 ; Invalid argument.

> 

> and neither worked.  So I'm back to thinking it's a driver issue.

Yes, that seems very likely to be the reason for both those commands 

failing.

Where to look next ?
I started this journey with a variety of web pages such as this one:
https://www.hackster.io/thatiotguy/enable-monitor-mode-in-tp-link-tl-wn722n-v2-v3-128fc6

I'm not wedded to this USB adapter, I'd like to know which one would actually work
in monitor mode, out of the box, with Fedora supplied drivers.

> P.S.  Looking at the newer Wireshark, I still didn't see a 'monitor'

> button.  Perhaps it's because the wi-fi driver isn't supporting it?

When you open the capture options dialog, you might need to scroll to 

the right to see the monitor checkbox.
Nope, I tried sending a screen shot, but the mailing list is holding my message for moderation.
There is a column in the table entitled Monitor Mode, but it's filled in with dashes.