Abstract: The study analyzes the methods and mechanisms the protection of information, structures attacks type DoS/DDoS/DRDoS and models of their tracking computer networks. Is developed classification of mathematical models of information threats which helps effectively to solve problems of counteraction of DoS/DDoS/DRDoS attacks. And also is carried the review of model of communication of the client and the server to see key problems of the architecture steady for the specified attacks on computer networks. Are analysed known approaches and models of tracking of attacks like DoS/DDoS/DRDoS. It is noted that for tracking of the IP address of a source of attack to refusal in service it is expedient to use a method probabilistic markings of packages.