Me too. I landed here when researching that log message. Sure enough, these messages came in the middle of some other complaints that I already know result from the vulnerability scan.

Yes, you can. When doing so, you give up diversity reception, which MAY introduce problems due to multipath fade.

I'm not sure I understand your description, but I think what you need is the Workgroup Bridge.

11a devices operate at 5GHz, 11b devices operate at 2.4GHz - they will not work together.The speed of the 11a link can only decrease while still associated to the 11a access point.

http://www.cisco.com/en/US/products/hw/wireless/ps430/products_configuration_guide_chapter09186a008010f63d.htmlhttp://www.cisco.com/en/US/products/sw/secursw/ps2086/products_user_guide_book09186a008007dea1.html