I don’t usually promote other articles – it’s kind of “cheating,” but short of copying and pasting the entire article, I’ve got to send you in the direction of Lisa Philfer’s article on “Five Steps to Eliminate Rogue Wireless Access.”
It’s really well written, and as an added bonus, points you toward some cool FREE tools for wireless monitoring. Not just the standard Wireshark, Kismet and Netstumbler, but a page full of neato tools by Xirrus.
When vendors offer up these types of tools, it makes me MUCH more likely to visit and examine their paid products.
She’s got some great suggestions for watching out for and dealing with rogue access points, not just the usual vendor shill. Bravo!