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Intrusion detection and countermeasures response is an active area of research. In this paper, we examine integrating an intrusion detection engine with an active countermeasure capability. We use a classic man in the middle attack as a case study to specify the integrated wireless intrusion detection capability with the active countermeasure response. We present a case study in dynamically defending against an example attack in an 802.11 infrastructure basic service set by combining the concepts for a distributed wireless intrusion detection and response system architecture with adaptive response strategies based on alarm confidence, attack frequency, assessed risks, and estimated response costs. We also include a description of a tool kit we have implemented to prototypically test and evaluate our concepts.