IFF_RUNNING and hostapd

Dave Taht dave.taht at gmail.com
Tue Oct 12 16:24:00 EDT 2010

On Tue, Oct 12, 2010 at 10:14 AM, Jouni Malinen <j at w1.fi> wrote:
> On Fri, Oct 01, 2010 at 03:32:42PM -0700, Dave Taht wrote:
>> I recently configured an openwrt system (a nanostation M) as a pure
>> router, not bridge, in AP mode.
> Which driver are you using for wlan0?

ath9k with nl80211
>> ip addr
>> for wlan0 shows the interface as UP, but with "NO CARRIER".
> I don't see that happening in my tests with ath9k..

Are you using it in unbridged mode?

>> It doesn't look like the hostapd I'm using sets the IFF_RUNNING bit, ever.
>> So I ask... at what point, and by what, and where should RUNNING be
>> setup on a AP mode, purely routed, non-bridged interface?
>> It seems like a good idea to leave it in the NO CARRIER state until
>> the first client authenticates.
> hostapd does not control this and the exact behavior is likely to depend
> on which driver is being used.

What does? My thought was basically IFF_RUNNING should be set
somewhere between these steps on a non-bridged AP, for the first
client that comes online - and unset after the last client goes

[  223.058446] wlan0: authenticated
[  223.058485] wlan0: associate with AP 00:18:39:e7:9c:f7 (try 1)
[  223.060904] wlan0: RX AssocResp from 00:18:39:e7:9c:f7 (capab=0x411 status=0
[  223.060906] wlan0: associated

> --
> Jouni Malinen                                            PGP id EFC895FA
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Dave Täht
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