[ath9k-devel] Bringing up More Than Two Station Mode Virtual Interfaces

Am 08.11.2016 um 06:02 schrieb Jack Fallington:
> I've been having a problem using the ath9k_htc driver and was hoping
> someone here might have some advice.
> 
> I'm trying to connect (on a single channel) to a single AP multiple
> times simultaneously using one physical wireless adapter. I haven't been
> able to bring up more than two virtual interfaces so far.
> 
> Here's my setup.
> 
> Linux Distribution:    Kali Linux 2016.2
> Kernel Version:    4.6.0
> Wireless Adapter:    TP-Link TL-WN722N
> Adapter Chipset:    Atheros AR9271
> Driver: ath9k_htc
> Firmware version: 1.4.0
> 
> Here's what I've tried:
> 
> Disable network-manager.
>     root at kali:~# /etc/init.d/network-manager stop
>     [ ok ] Stopping network-manager (via systemctl):
> network-manager.service.
> 
> Disable hardware encryption, because I've read this adapter won't
> support virtual interfaces with hardware encryption enabled.
>     root at kali:~# echo "options ath9k_htc nohwcrypt=1"
>>/etc/modprobe.d/ath9k_htc.conf
>     root at kali:~# modprobe ath9k_htc
>     root at kali:~# cat /sys/module/ath9k_htc/parameters/nohwcrypt
>     1
> 
> Create three virtual interfaces with unique MAC addresses.
>     root at kali:~# iw dev wlan0 interface add wlan1 type station
>     root at kali:~# iw dev wlan0 interface add wlan2 type station
>     root at kali:~# iw dev wlan0 interface add wlan3 type station
>     root at kali:~# macchanger -r wlan1
>     Current MAC:   [redacted] (unknown)
>     Permanent MAC: [redacted] (unknown)
>     New MAC:       ea:4c:bc:e0:8b:36 (unknown)
>     root at kali:~# macchanger -r wlan2
>     Current MAC:   [redacted] (unknown)
>     Permanent MAC: [redacted] (unknown)
>     New MAC:       52:3a:02:22:4d:4a (unknown)
>     root at kali:~# macchanger -r wlan3
>     Current MAC:   [redacted] (unknown)
>     Permanent MAC: [redacted] (unknown)
>     New MAC:       da:05:ce:1e:d0:41 (unknown)
> 
> Attempt to bring the new virtual interfaces up.
>     root at kali:~# ifconfig wlan1 up
>     root at kali:~# ifconfig wlan2 up
>     root at kali:~# ifconfig wlan3 up
>     SIOCSIFFLAGS: Device or resource busy
> 
> The third interface fails to come up.
> 
> On this page <http://www.candelatech.com/vsta.php>, they say, "We have
> successfully tested more than 200 stations and up to 4 APs per radio/NIC
> using ath9k and our code trees." They don't mention ath9k_htc, but I was
> hoping it also would also allow more than two station mode virtual
> interfaces. Or perhaps it's a firmware or hardware limitation causing my
> problem.

yes.

> Is there anything else I can try? If not, is there another chipset and
> driver combination that would allow me to use at least 20 simultaneous
> station interfaces?

try ath9k.

-- 
Regards,
Oleksij

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