Re: WiFi: Problem with Entreprise networks (with multiple routers)

On lun, 2013-10-14 at 12:20 -0500, Dan Williams wrote:
On Mon, 2013-10-14 at 18:39 +0200, Matthieu Baerts wrote:
Hello Dan and thank you for this answer,

On Mon, 2013-10-14 at 09:41 -0500, Dan Williams wrote:
This problem is most definitely a supplicant issue.  The supplicant
roams too aggressively, even if the currently associated access point
has a very good signal.  We've patched that in Fedora, but as you
indicate, your kernel wifi driver is also not working correctly when
reporting signal strength.

Thank you for these details!
Do you know if it's possible to configure wpa_supplicant (via NM or not)
to be less aggressive but without having to patch it? (or to force it to
not switch between access points?).

I know that we can force wpa_supplication to try to connect to a
specific access point (by using the mac address) but it's not what I
want: I don't want to change the settings each time I want to connect to
a different access point of this network.

Correct, you want to keep roaming enabled, and that's not possible
(obviously) when locking to a specific access point.  There a few things
that will make this better:

1) Apply the following patch to your wpa_supplicant, which will make the
problem much better but

2) Apply the following commit to your NetworkManager packages, which
requests that the supplicant scan for roaming a little less often:

3) Wait for some upstream changes to the supplicant, which will include
*some* form of the above patch, as well as one I posted upstream to
request the supplicant not to roam as a result of an information-only
scan that NetworkManager periodically does.

Thank you for these patches, I'll have a look asap! (but I'm not sure
I'll be able to test it soon)

Obviously all these fixes depend on the kernel driver also reporting the
signal strength correctly...


I'm currently connected to an access point. iwlist gives me a list of 40
access points (each access point has 5 virtual interfaces). All
non-connected access points have a quality of 70/70 and a signal level
of 10 dBm. On the other hand, all 5 virtual interfaces of the current
connected access point have a quality of 58/70 and a signal level of -52
So I guess your patch for NM should help me!


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