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Message from csmith6@swarthmore.edu

Hello folks, I am wondering if anyone else is seeing a problem with laptops running Ubuntu 12.04, Precise Pangolin, getting connected to WPA2 protected networks? I have reports of four students with this version of Linux not getting connected to our WPA2 Enterprise (802.1x) or the WPA2 Personal/preshared key wireless networks but they can connect to the open mac auth'd guest network. I found several threads discussing problems with wireless on 12.04. This page seems to summarize them: http://www.linuxplained.com/how-to-fix-wireless-problems-in-ubuntu-1204-... No word yet on if they have fixed any of our students problems. Here is what happens for the one client seen in person. It is an Acer Aspire 5750G with an Atheros AR5B97 Wireless Network Adapter. The client can connect to the network, get authenticated and get an IP address. If we immediately start a ping to the gateway, we see it work for 30-45 seconds then it stops. If we open a web page during that period it will sometimes open if we are quick. From controllers side everything looks fine. No black list or receive errors from the AP. Other clients are not effected in any way. When the client boots into Windows partition there are no problems using the WPA2 Enterprise 802.1x network. Our wireless controllers are running ArubaOS 6.2.1.2. I have a ticket open with Aruba Support and am waiting to hear back after sending some logs and debugging earlier today. I wanted to reach out the this community to see if anyone else has seen this problem and maybe even found a solution. Thanks, Aaron Smith Network Engineer Swarthmore College ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

Comments

We had a similar issue with Aruba 6.2.1.1 - The difference was that the user could connect to the eduroam SSID with no issues. The only difference was that band steering was not enabled on the eduroam SSID. I had the user follow the instructions on the web page listed below to disable the 802.11n as it seems to be a driver issue with the high data rates. sudo modprobe -r iwlwifi sudo modprobe iwlwifi 11n_disable=1 This is where I found the info to pass along to the user. http://ubuntuforums.org/showthread.php?t=2030227 >
Message from csmith6@swarthmore.edu

Hi Chris, Thanks for the suggestions. We are not using band steering, but always worth checking. Disabling the N functions is a good idea. I will add that to list of things to try. I am going to see if I can reproduce the problem via a live CD on a different laptop. Thanks, Aaron
Hi Aaron, Some questions: what EAP type do you use and are you using 1024 or 2048 bit certs? Assuming you're using an external DHCP server do you use the Enforce DHCP feature? We are also running ArubaOS 6.2.1.2 and have not heard of reports of issues, yet, but I will keep an extra eye out. We use XpressConnect to configure EAP-TTLS/PAP with a 2048 bit cert. Mike Michael Dickson Network Analyst University of Massachusetts Amherst
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