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Cisco Wireless LAN Security Review by W Boudville
how to bolt down your wireless LAN
The title explicitly says Cisco, and indeed there is a lot of material enclosed that is specific to how Cisco implements its wireless routers. But you could plausibly also use this book as a good guideline to general purpose wireless security.
The authors have gone to some length to explain the general principles of 802.11*. In and of itself, this will be useful to some readers, for 802.11 is now a huge set of complex standards. With the official documentation being quite turgid prose, though necessary of course. For clarity, this book is a good and far more understandable alternative.
The text also goes into associated topics, like the encryption protocols associated with 802.11. Plus, and this is important, it describes third party, often open source, tools that can be used to sniff for insecure networks. Tools like Kismet or Wellenreiter, where the latter is meant for wardriving. One of the first things you should do is download and use one of these tools [or even several of them] against your wireless net, if it is already running. Better that you discover any weaknesses in it, than others do so.