Wireless Lan connection issue with Linux clients

Hi
In a large Wireless Lan enviroment for a university, we have 3 WISM moduls attached on a 6k hw - Manged by ACS v6.0.181.0
We recently upgraded the software version of the controllers from 4.x to 7.0.98.0 - the Emergency Image version is 5.2.157.0
Since then, the students with Linux clients have massive connection issue - repeated connection lost in a short time period.
However the students with Windows clients have no problem at all.
The studends report, that their linux clients getting so much of some kind of unnecessary broadcast traffic which can not be handled by the NIC - and the NIC goes down - and this happens all 5-10 minutes.
Affected Linux clients are: Ubuntu v10.10 - also OpenSuse, Fedora and Arch-linx with latest OS version.
Any Idea how I could solve this problem?
Thanks in advance for your help

Hi Nicolas
Thanks for your reply. The broadcast forwarding is disabled on WLC's.
Pls find below the attached picture, which shows the captured broadcast traffic on a linux client (sent by a student to me).
I'm not sure, if its really only the broadcast traffic, which the linux clients can not handle.
From my point of view, it seems also to be that the linux clients are somehow disadvantaged among the other clients like windows or mac, if they all trying to get a wireless connection.
But the fact is only the linux clients are affected - and this happens to the linux clients only in our wireless infrastructure.
Windows or Mac clients have no such problem at all
regards
Enis

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