Can't add wlan0 to br0

Kacper kacper at
Mon Jan 11 12:09:22 EST 2010

One option would be to let hostapd add the interface to a bridge,
since it already has a bridge parameter.

On Mon, Jan 11, 2010 at 5:54 PM, Jouni Malinen <j at> wrote:
> On Mon, Jan 11, 2010 at 05:45:42PM +0100, Kacper wrote:
>> After further testing I have concluded that you can only add the
>> wireless interface into a bridge after hostapd has started. Why is
>> that and how can it be fixed?
> That is a recent change in the kernel, i.e., it is preventing users from
> configuring bridging incorrect (IEEE 802.11 does not allow it to be used
> in station mode). I'm not sure whether I would fully agree with it being
> that good of an idea for kernel to enforce this because of this
> particular issue that you are seeing. There is really no fix for this.
> As a workaround, you could try to set interface type into AP mode first
> with iw and then adding the bridge entry before starting hostapd. You
> will need to use an undocumented "__ap" with iw since this operation is
> not really recommended for users to avoid confusion on AP mode
> requirements.
> --
> Jouni Malinen                                            PGP id EFC895FA
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