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Mon Jun 3 00:10:54 EDT 2013


1) 1 AP + 1 client
2) 2 clients

but for both options, it appears that everything has to be on the same
channel as the driver or hardware cannot handle multi-channel
simultaneous operation.

> Also, any idea whether 1 AP + 1 STA simultaneously on the same radio is
> supported by ath9k?

What does the iw output say for valid interface combinations?  That will
tell you.  But my guess is yes since ath9k is modern hardware and
driver.

Dan

> Any performance impacts to the AP when in this mode (does it add
> contention)?
> 
> Thanks,
> 
> Jeremy D. Ward, CWNE
> (954) 661-4965
> On Thu, 2015-01-15 at 14:15 +0100, Harm Verhagen wrote:
> > Hi,
> >
> > I'm looking for a way to have simultaneously  an AP and a wireless client
> > with a _single_ wifi device.
> >
> > I am able to start multiple SSIDs with hostapd, following [1]. This works
> > perfectly. I can connect to each SSID. (tested with 4 SSIDS)
> >
> > This gave me the idea, that if hostapd can create 'new' wlan devices. I
> > (hopefully) can configure the 2nd  wlan0_0 device as a wifi client.
> 
> It depends on your hardware and driver whether this is possible.  Look
> at the output of "iw phy phy0 info", where you should see stuff like:
> 
>         valid interface combinations:
>                  * #{ managed } <= 1, #{ AP } <= 1,
>                    total <= 2, #channels <= 1, STA/AP BI must match
>                  * #{ managed } <= 2,
>                    total <= 2, #channels <= 1
> 
> These lines indicate what your hardware and driver can do at the same
> time.  In this case (Intel 6250, iwldvm driver) I can do 1 AP + 1 STA,
> or 2 STA at the same time, but all must be on the same radio channel.
> 
> Before starting hostapd (for the AP) and wpa_supplicant (for the STA)
> you could create the STA interface yourself:
> 
> iw dev wlan0 interface add wlan0-STA type managed
> 
> which you can then pass to wpa_supplicant for use as a STA/client.
> However, note that if you have restrictions on channel numbers (like my
> output above does) you'll have problems connecting the STA to APs on
> other channels.
> 
> Dan
> 
> >
> > Usecase: For a device thats
> > 1) sometimes, when near an AP it needs internet acces for itself (hence
> the
> > required 'client' functionality)
> > 2) needs to be connected to some other devices, that are only wifi
> clients.
> > (these devices don't needs to access internet, only direct access to my
> > device).
> >
> >
> > I tried letting hostapd create the 2nd interface(wlan0_0)  by just adding
> > bss=wlan0_0  to my hostapd config file.  It does create the device, but
> > trying to 'ifup' that as a client (no security yet)  fails.
> >
> >
> > Anyone have any clues how to achieve this ?
> >
> > host: linux
> > wifi: GWF-3M05 IEEE 80211 Wlan module (usb)
> >
> > Regards,
> > Harm Verhagen
> >
> > [1] http://wiki.stocksy.co.uk/wiki/Multiple_SSIDs_with_hostapd
> > _______________________________________________
> > HostAP mailing list
> > HostAP at lists.shmoo.com
> > http://lists.shmoo.com/mailman/listinfo/hostap
> 
> 
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