[PROPOSAL] Add hostapd.conf parameter to skip checkforneighboringBSS (prevent fallback in 150Mb mode)

Valeriy Kucherenko darkside_ua
Sun Mar 4 12:50:20 PST 2012


I'm using this workaround too, but have noticed that my clients sometimes fallback into 150mbps mode again. I have not investigated this problem.
Simple reconnect or hostapd restart solves this for some time.
Did you have that behavior too?

> Hello,
> Sorry I cannot find how to reply to existing thread just after subscribe. So I had to use
> the same topic name.
> Here is hostapd -d start log
> Scan for neighboring BSSes prior to enabling 40 MHz channel
> Scan requested (ret=0) - scan timeout 10 seconds
> Interface initialization will be completed in a callback
> nl80211: Event message available
> nl80211: Scan trigger
> [...]
> nl80211: New scan results available
> Received scan results (4 BSSes)
> 40 MHz affected channel range: [2422,2472] MHz
> Neighboring BSS: cc:96:a0:f5:4a:00 freq=2422 pri=3 sec=7
> 40 MHz pri/sec mismatch with BSS cc:96:a0:f5:4a:00 <2422,2442> (chan=3+) vs. <2457,2437>
> 20/40 MHz operation not permitted on channel pri=10 sec=6 based on overlapping BSSes
> I can change channel to any between 1 and 10 in hostapd.conf and got the same result.
> using HT40- instead HT40+ did not help.
> If primary or secondary channel is 11+, I got something like that
> nl80211: Failed to set channel (freq=2462): -22 (Invalid argument)
> but that's unrelated to the problem, IMHO.
> Why  I'm not able to force 40MHz operation in my apartment? OK, I can "hear" neighboring
> APs through the concrete walls with low signal quality, so what? This is my apartment, not
> neighbors. And even if we share walls or floor, I'm still want to use 40MHz like the
> neighbor did. So I had attached quick patch just to disable 20MHz fallback.
> I understand you guys trying to make things right, but I use Linux to make things as I
> need, and that's why I love it. Being smart is clever but I need an ability to disable this.
> Thanks,
> Alex
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