OLBC HT AP detected - enable protection

Ben Greear greearb
Sat Mar 30 12:35:31 PDT 2013

On 03/30/2013 09:10 AM, Jouni Malinen wrote:
> On Tue, Mar 26, 2013 at 01:05:19PM -0700, Ben Greear wrote:
>> When trying to run HT40 on channel 149, we see this message in the logs,
>> and stations cannot scan the AP (hostapd is running though).
>> 31.087832: OLBC HT AP detected: c0:c1:c0:38:e1:cb - enable protection
> Could you please clarify what you mean by stations not being able to
> scan the AP?

I mean that stations scan but do not see the AP when I saw this OLBC
message.  Other APs showed up as expected in the scan.

>> The c0:c1... AP in question is running in 2.4Ghz band.
>> If we disable HT40 then it comes up fine.
>> Is this expected?
> No. The part of detecting non-HT overlap is supposed to apply only for
> overlapping channels and is fixed here:
> http://w1.fi/gitweb/gitweb.cgi?p=hostap.git;a=commitdiff;h=a5f61b2b87ceffec517e3baf531a466940dbd0b7
> The part of stations not being able to scan the AP sounds strange, so I
> would like to understand what you meant with that.

I'll update to the latest hostapd and we can re-run these tests, but
might be a few days...


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

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