Re: Scanning and channel types.

[Ben Greear <greearb@candelatech.com>]

On 02/07/2011 03:53 PM, Daniel Halperin wrote:
> On Mon, Feb 7, 2011 at 1:02 PM, Ben Greear<greearb@candelatech.com>  wrote:
>> On 02/07/2011 12:10 PM, Daniel Halperin wrote:
>>>
>>> On Mon, Feb 7, 2011 at 12:04 PM, Ben Greear<greearb@candelatech.com>
>>>   wrote:
>>>>>
>>>>> Start on 5 GHZ AP with HT Only set.  Scan.  What rate are probes sent
>>>>> at for 2.4 GHz?
>>>
>>> No HT20 is not the same as HT-Only.  I'm not sure how to set that. Jouni?
>>
>> I found a post from a year or so ago that indicates hostapd doesn't
>> support this type of thing (that could have changed, of course).
>>
>> Do you know of any commercial APs that support the HT-only feature?
>> (And/Or a general strategy for configuring it?)
>>
>>>> On 5Ghz channels, they are sent at 6Mbps
>>>> On channel 3 (2.4Ghz), they are sent at 1Mbps
>>>>
>>>>
>>>> That seem right?
>>>
>>> Yes, for a HT20 but not HT Only AP.
>>
>> Seems to me that the probe-request is to any/all APs,
>> so how could we possibly know that we should send it
>> at 6Mbps v/s 1Mbps until we discovered and communicated
>> with it?
>
> Just as there are G-only APs that don't advertise 1-11 Mbps in their
> beacons, there are HT-only APs that don't advertise support for 1-11
> or 6-54 Mbps in their beacons and *only* support MCS rates.

Well, I don't think my changes would have made this any worse,
so if it worked before, it probably still works.

If anyone knows how to configure such a beast, I'll run some
tests.  Or, if someone else has an AP like this, please let
me know if you see any problems with these patches.

Thanks,
Ben


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