wiki:CentrinoIssue

Wireless issues with Intel Centrino cards and the IETF APs

If you are having issues using the IETF wireless networks, but it works if you use the ietf-hotel please read further.

Please try using the new SSID called ietf-2.4ONLY. This may solve your problem.

If you continue to have problems please report this either by opening a ticket or visiting the help desk in the terminal room. See https://tickets.meeting.ietf.org/ and https://tickets.meeting.ietf.org/wiki/IETF92network for more information on getting help.

Details

We have identified a compatibility issue with the Cisco APs and certain wireless cards. At this point, all clients affected have been using Intel Centrino 6xxx AGN cards (where xxx is 200,205,250,300,310, and possibly others).

The bug is fixed in some Cisco images and APs, but it does not appear to be fixed for the APs we are using here, or we have a new bug. We are actively working on this issue with Cisco and hope to get a fix soon.

We have implemented a new SSID, called ietf-2.4ONLY that will allow clients to select the 2.4Ghz radio.

Clients can also disable the 802.11n and ac data rates on their client card and they should be able to use any of our SSIDs on any radio. On Windows, this can be done by configuring the adapter properties and setting 802.11n mode to "Disabled".

It has been reported that on Windows, updating to driver version 15.11.0.7 for the 6200 will fix this. Upgrading the Intel driver to the latest version should resolve the issue at least on the client NIC side. There is an exception to this, however. The 6200 and 6300 cards on Linux have a latest driver version of 9.221.4.1. This driver is known not to work. The Windows drivers can be downloaded from https://downloadcenter.intel.com/default.aspx and the Linux drivers from http://wireless.kernel.org/en/users/Drivers/iwlwifi .

We also have a limited number of USB->WiFi adaptors that we can lend out if all other options fail. These should work on Windows with no drivers.

Last modified 3 years ago Last modified on 20 Mar 2015, 23:00:30