Changing Channel On-The-Fly

Kahn, Gery geryk at
Mon Jan 24 09:52:35 EST 2011

Just forget my previous email, if u can :)

On Mon, Jan 24, 2011 at 16:50, Kahn, Gery <geryk at> wrote:
> It looks like roaming case, isn't it?
> On Sun, Jan 23, 2011 at 18:14, Jouni Malinen <j at> wrote:
>> On Thu, Jan 20, 2011 at 04:01:20PM +0200, Volkan YAZICI wrote:
>>> How can I change the channel hostapd is operating at without losing
>>> established connections? Editing hostapd.conf and sending a SIGHUP makes
>>> hostapd change the channel, but it loses established connections. On the
>>> other hand, I don't want to edit hostapd.conf; I want to make this
>>> configuration from a C/C++ application. (Hence, ioctl() calls, libnl
>>> uses are welcome.) Any helps will be really appreciated.
>> This is not currently supported, but will be needed for proper DFS/radar
>> detection support, so there is interest in getting proper channel switch
>> support added in the near future. Since hostapd is in control of the
>> Beacon frame template with some drivers, it needs to know the current
>> channel and direct ioctl/libnl use is not a viable direction for this in
>> many cases.
>> --
>> Jouni Malinen                                            PGP id EFC895FA
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