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Re: hostapd & mac80211: too many probe responses

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Am Freitag, 1. April 2011 schrieb Johannes Berg:
> On Fri, 2011-04-01 at 12:37 +0200, Helmut Schaa wrote:
> 
> > I've just noticed that hostapd + mac80211 + rt2x00 produces way too many
> > probe responses when setup as multi bssid AP.
> > 
> > The reason seems to be that mac80211 receives a broadcast probe req and
> > drops it to the monitor interface for each vif (hence X times). And hostapd
> > will process each received broadcast probe req on all vifs as well (hence X
> > times again). Resulting in X*X probe responses instead of just X.
> > 
> > This can eat up quite some airtime as the probe reponses are sent at 1Mpbs.
> > 
> > IMO to fix this issue mac80211 should send a broadcast probe req only once
> > to the monitor interface. However, I don't have a good idea how to do that
> > right now :)
> 
> Looks like we broke that then, IEEE80211_RX_CMNTR was intended to do
> this. 

Ah, I see. I'll do some more debugging in that direction first ...

Helmut
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