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The paper discusses some problems in the use of intrusion detection systems (IDS), especially related to evasion attacks. Important characteristics of this type of attack are presented, and the possibilities for attack analyzed. Characteristics of network and host based IDS systems are compared, and some aspects of a distributed approach to the architecture of IDS are analyzed. On the basis of such discussion, the paper proposes the use of distributed network based IDS systems, which are client based, in the detection of evasion attacks. The proposed model is compared to host based intrusion prevention systems (HIPS). Important characteristics of the model are discussed. Some implementation issues are presented.