Question on ht40_intolerant

[Ann Lo]

This is very helpful information.

Thanks,
Ann

On Thu, Apr 28, 2016 at 3:13 PM, Ben Greear <greearb at candelatech.com> wrote:
> On 04/28/2016 10:43 AM, Jouni Malinen wrote:
>>
>> On Thu, Apr 28, 2016 at 06:42:15AM -0700, Ann Lo wrote:
>>>
>>> We are hoping to limit our wpa_supplicant to get connections with 20
>>> MHz channel width only. Is it adequate to set "ht40_intolerant=1"?
>>> Usually 40 MHz intolerance is used on 2.4 GHz band. Can we use it for
>>> 5 GHz band?
>>
>>
>> ht40_intolerant=1 does not prevent use of 40 MHz by the local device..
>> It is trying to make everyone in range not use 40 MHz on 2.4 GHz..
>> disable_ht40=1 might work for this, if I understood what you are trying
>> to do correctly.
>>
>
> In case the desire is to have a VHT-20 station on a VHT80 AP, I am not
> sure it can be done.  disable-ht40 might allow you to have an HT-20 station
> on VHT80 AP.
>
> From what I recall, there is no way to advertise a VHT-20 station since the
> spec does not allow for a VHT station that cannot do VHT-80.
>
> At least with some driver hacking and proper firmware, it would be possible
> to
> disable all 40 and 80Mhz rates, so the station would always transmit 20Mhz
> rates, but it would still be receiving up to 80Mhz wide packets...
>
> Thanks,
> Ben
>
> --
> Ben Greear <greearb at candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>