DDoS attacks are one of the most common and dangerous attacks on a Wi Fi network. Protection systems against them are quite cumbersome and expensive, which only the largest corporations can afford. In order to detect a DDoS attack and not resort to full network monitoring and check all received packets, since detecting this type of attack is quite simple using signs that can be seen without using special equipment and specialized programs. The ability to use the command line and view the Internet interface of the router is enough.