Dual band

[Fejes József]

On Tue, Jan 2, 2018 at 4:14 PM, Ben Greear <greearb at candelatech.com> wrote:
>
>
>
> On 01/02/2018 04:28 AM, Fejes József wrote:
>>
>> Hi,
>>
>> This question was asked a couple of years ago (eg. here
>> http://lists.infradead.org/pipermail/hostap/2012-January/025117.html)
>> with a negative answer.
>>
>> However, it seems like things have changed in Linux at least. Recent
>> wifi cards support multiple virtual interfaces with multiple channels.
>> Eg. with the command: iw dev wlan0 interface add wlan1 type __ap .
>> Thus even if I have one card with one chip, I can have multiple wlan
>> devices and the card will handle communication with different
>> bands/channels accordingly.
>
>
> Which cards do you think support this option?
>

For example iw reports this for a BCM4366 (it also reports both 2.4GHz
and 5GHz bands in the channel list):

valid interface combinations:
* #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,
  total <= 3, #channels <= 1
* #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,
  total <= 4, #channels <= 1
* #{ AP } <= 4,
  total <= 4, #channels <= 1, STA/AP BI must match

Last combination is the key, you can create 4 AP-type interfaces at
the same time. Although it says channels<=1 which is weird for
dual-band but whatever. I've seen pastes where channels was 2.



>
> Thanks,
> Ben
>
>>
>> My question is, does hostap work with such virtually created
>> interfaces for the same chip?
>>
>> It would be even better if hostap could create such virtual interfaces
>> on its own. Is it supported or is it going to be supported?
>>
>> Cheers,
>> Jozsef
>>
>> _______________________________________________
>> Hostap mailing list
>> Hostap at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/hostap
>>
>
> --
> Ben Greear <greearb at candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com