What is "smurf attack"

n. (context computing security English) A largely obsolete form of denial-of-service attack, involving broadcasting ICMP packets with the intended victim's IP address to a large computer network, causing the victim's computer to be overwhelmed by the response packets from the network.

The Smurf Attack is a distributed denial-of-service attack in which large numbers of Internet Control Message Protocol (ICMP) packets with the intended victim's spoofed source IP are broadcast to a computer network using an IP Broadcast address. Most devices on a network will, by default, respond to this by sending a reply to the source IP address. If the number of machines on the network that receive and respond to these packets is very large, the victim's computer will be flooded with traffic. This can slow down the victim's computer to the point where it becomes impossible to work on.