Re: How to configure monitor devices for HT80?

[Ben Greear <greearb@candelatech.com>]

On 05/07/2014 02:01 AM, Johannes Berg wrote:
> On Tue, 2014-05-06 at 10:56 -0700, Ben Greear wrote:
>
>> But, it seems if I have another vif up, it will fail, even if that
>> vif is (should be?) using the exact same frequency.
>>
>> ./local/sbin/iw phy wiphy0 interface add moni0 type monitor
>> ./local/sbin/ip link set dev moni0 up
>> ./local/sbin/iw dev moni0 set freq 5180 80 5210
>> -> yields error:
>> command failed: Device or resource busy (-16)
>
> You can't set the monitor frequency if you're using the hardware for
> something else already. We could potentially allow that if the chandefs
> are compatible, but that's getting into really messy territory so I'm
> not sure I want to go there - if for example the other interface
> switches bandwidth or even channel the monitor would usually simply
> follow around.

Ok, as long as I know why then the failure is not so concerning.

Another question:  if I create a monitor interface first, and
successfully set it's frequency, what do I need to do to allow
a station to move to a different frequency later?

Thanks,
Ben

>
> johannes
>

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com