Hi.
I asked in the ath5k-user list about how to change roaming behavior of
ath5k. Pavel Roskin told me that I asked here.
I need to modify the roaming behavior, where can I do this?
Thanks for all,
David
P.D: sorry for my poor english
El mar, 11-08-2009 a las 09:59 -0400, John W. Linville escribió:
> On Tue, Aug 11, 2009 at 12:44:51PM +0000, David Seira wrote:
>
> > I asked in the ath5k-user list about how to change roaming behavior of
> > ath5k. Pavel Roskin told me that I asked here.
> > I need to modify the roaming behavior, where can I do this?
>
> This is mostly in the hands of wpa_supplicant...what modifications
> do you want to make?
>
> John
Hi.
I want to delete this behavior because I'm developing an application
which do that alone.
Thanks for all,
David
P.D: I have an OpenWRT r16278. The files that I want to modify were in
compat-wireless-2009-05-21, but I don't know which are.
> I want to delete this behavior because I'm developing an
> application which do that alone.
Please look at wpa_supplicants behavior when you configure
ap_scan= and scan_ssid=. With them, you can configure
wpa_supplicant to not issue scan requests on it's own.
Then your user-space app can do the monitoring, scanning (via
nl80211) issue a command to wpa_supplicant to authenticate to
some AP.
Another option would be to look into network-manager and see what
it offers.
But basically, mac80211 has inferior support for roaming compared
to some older solutions.
Some examples: with madwifi, I can tell the driver to only scan
on channels 1,6,11. That's not exactly standards-conforming, but
can speed up roaming considerably, because a full scan is now
way shorter. mac80211 doesn't support such a thing directly. It
just occurs to me that you might be able to do something like
with with a special regulatory daemon.
Or with orinoco, you could define a level when to roam (e.g. at
what SNR/RSSI/whatever it is based on). mac80211 doesn't have
this.
I'm quite sure that this will be eventually done, and then you
have the same seamless roaming with all/most of your WLAN cards,
where with the pre-mac80211 only some of the card did somewhat
well and other cards were only usable for hot-spot operation.
--
http://www.holgerschurig.de
On Tue, Aug 11, 2009 at 12:44:51PM +0000, David Seira wrote:
> I asked in the ath5k-user list about how to change roaming behavior of
> ath5k. Pavel Roskin told me that I asked here.
> I need to modify the roaming behavior, where can I do this?
This is mostly in the hands of wpa_supplicant...what modifications
do you want to make?
John
--
John W. Linville Someday the world will need a hero, and you
[email protected] might be all we have. Be ready.
On Wed, 2009-08-12 at 09:07 +0200, Holger Schurig wrote:
> Some examples: with madwifi, I can tell the driver to only scan
> on channels 1,6,11. That's not exactly standards-conforming, but
> can speed up roaming considerably, because a full scan is now
> way shorter. mac80211 doesn't support such a thing directly. It
> just occurs to me that you might be able to do something like
> with with a special regulatory daemon.
Or you can just ask wpa_supplicant to do that with -Dnl80211.
> Or with orinoco, you could define a level when to roam (e.g. at
> what SNR/RSSI/whatever it is based on). mac80211 doesn't have
> this.
The intention is to add signal strength triggers to mac80211/drivers to
notify wpa_supplicant which then implements the algorithm. There are a
ton of algorithms to choose from, so this will be very good for
experimentation, academia and getting the best algorithm eventually :)
Right now you don't have signal strength triggers so you'd have to
monitor the signal strength (like "iw wlan0 link").
johannes