Re: No inter-AP Roaming?

On Dec 4, 2007 10:08 PM, Derek Atkins <warlord mit edu> wrote:
> Quoting Dan Williams <dcbw redhat com>:
> > On Tue, 2007-12-04 at 15:31 -0500, Derek Atkins wrote:
> >> I'm sitting at the IETF, connected to the 802.11 network..
> >> But as I wander from room to room, NM doesn't roam.  It wont
> >> jump from one AP to another as I move around the conference
> >> facility.  I'll get to my new room and find that I no longer
> >> have any network and then have to wait for a full connection
> >> sequence.
> >>
> >> What gives?  I certainly don't have this problem if I just
> >> let the driver/hardware roam on its own.
> >
> > Well, NM doesn't control roaming at all, wpa_supplicant and the driver
> > do.  Sometimes wpa_supplicant will push the BSSID down to the driver
> > when connecting (not entirely sure when that is) and if the driver
> > actually follows WEXT (which lots don't) that would cause the driver to
> > lock to that single BSSID and not switch.  That bit is highly driver
> > dependent.  It looks like wpa_supplicant will only do this when it has
> > previously timed out authentication with the station but tries again
> > (like it should).  It then passes the BSSID down to the association code
> > which tries to lock the card to that BSSID specifically.
> Interesting.
> I'm using the iwl3945 driver.  I DO see some authentication timeouts,
> which is really weird.. Sometimes to the point where it wont even
> successfully authenticate to the card at all and I have to reset.
> Very frustrating.

that might be because the card is doing a scan at that time.. there is
a patch posted upstream (linux-wireless) that should fix this by
delaying scans while authenticate

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