[ath9k-devel] ath9k: Virtual interface as AP

["\"Lorna González\"" <lorna.glez@gmx.net>]

Hello 

I finally got a station an a virtual AP working on the same channel using the setup below. I made some test sending TCP through iperf between the AP and the station and the VAP to a station associated with it. 
Using an AP operating with Ieee802.11n, an atheros AR928X and without virtual interfaces I get a max throughput of 50 MBits/s. 
As soon as I start using my desired setup, the thoughput of the station is about 15 MBits/s... I actually need to make the rate fixed using iwconfig to get this max. Otherwise the traffic is sent at 1 MBit/s.

Can someone please tell me how is the behaviour of the rate control in case of virtual interfaces on mac80211?

Thanks in advanced

Lorna Gonz?lez. 



-------- Original-Nachricht --------
> Datum: Thu, 28 Oct 2010 11:03:47 +0300
> Von: Jouni Malinen <jouni.malinen@atheros.com>
> An: "\\"Lorna Gonz?lez"" <lorna.glez@gmx.net>
> CC: "ath9k-devel at lists.ath9k.org" <ath9k-devel@lists.ath9k.org>
> Betreff: Re: [ath9k-devel] ath9k: Virtual interface as AP

> On Thu, 2010-10-28 at 00:47 -0700, "Lorna Gonz?lez" wrote:
> > After trying to build two virtual interfaces, one as a STA and another
> one as AP on mac80211 with an AR928X, creating a new interface with:
> > 
> > iw phy phy0 interface add wlan1 type __ap
> > 
> > I got a new interface called wlan1_rename, the one I used to build the
> AP interface.
> 
> > But no other stations are able to see this Virtual AP and no more frames
> are sent from the VAP. 
> 
> How did you set the MAC addresses on the interfaces? Based on a quick
> test, I was able to get hostapd running on the interface created with
> the command above at least when not changing the address on the created
> interface. A station was able to see the AP and associate. Then I
> changed the MAC address of the original interface by setting locally
> administered bit (02:<rest of addr>) and I was able to associate it as a
> station to an AP that was running on the same channel. The ping from the
> virtual AP interface was still going through.
> 
> Just keep in mind that not all combinations will work as far as key
> setup is concerned. In other words, you may be able to get associated
> with multiple interfaces, but the data frames may not get through if the
> driver is not yet ready to the setup you tested. These will be
> eventually addressed for most cases, but for now, you may also want to
> experiment with nohwcrypt=1 if you see something that could be caused by
> this.
> 
> - Jouni
> 
> 

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