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I am running Colubris 320's, the latest version of firmware gives you the ability to enable or disable WMM advertising. I have noticed that certain Centrino laptops are not able to associate to the AP when WMM is enabled.

Does anyone have any further insite to this? And where can I see if WMM is being broadcast in a packet capture?

The WMM has to do with the QoS. The Centrino may be looking for some QoS indicator as part of the way it calculates the RSSI value. I am not sure about that, just a guess. To find the WMM information capture some beacon frames and look for any 802.11e information it may not be listed as WMM in your capture. A good place to start looking for WMM information is:

http://www.wi-fi.org/OpenSection/white_papers/whitepaper-090104-wmm/


Do all of your Centrino machines have the same issue? I run two Colubris 320s at home but have no Centrino based machines to duplicate the issue.

It does not happen with all Centrino's specifically the only one I have seen it happen on is an Intel 2200BG card. I resently supported an IBM conference where about 50% of the attendies had IBM T43's which none of them where able to associate until I turned off WMM advertising.

http://www.intel.com/support/wireless/wlan/sb/cs-015402.htm

http://support.intel.com/support/wireless/sb/cs-020093.htm



This may help.

Cool, Thanks for that!

Compughter,

I checked out that top link you posted:

http://www.intel.com/support/wireless/wlan/sb/cs-015402.htm

Holy smokes batman. This is HIDEOUS! This is the most outrageous show of WLAN cheating I've ever seen. This Intel feature called, "Intel Throughput Enhancement" breaks DCF and EDCA rules and basically causes a denial of service on all other clients in the BSS.

I had no idea anything like this was available. Thanks for posting!

Devinator

Devinator,

I found the wording quite interesting myself. Didn't go to deep into it but it sounds like Flash OFDM technology enhancements to me. Netgear has integrated Flash OFDM into one of their APs fo the backhaul.

Intel must have a chip that allows the WMM and "Intel Enhanced" quality of service settings to prepare us for the migration to the Unified Wireless IP network of the future? They are probably using this enhancement only on the "uplink" for WLAN (802.11 access points) to give users a taste of what Flash OFDM is capable of.


http://www.flarion.com/products/whitepapers/qos.pdf

http://www.flarion.com/mbr814/MBR814XF_datasheet.pdf


V/r