Bogus ECHO reply packets are flooded on the network spoofing the IP and MAC address

The ICMP packets signal the victim system to reply and the combination of traffic saturates the bandwidth of the victim's network

ECHO packets are flooded on the network saturating the bandwidth of the subnet causing denial of service

A DDoS ICMP flood attack occurs when the zombies send large volumes of ICMP_ECHO_REPLY packets to the victim system.