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Introduction to DDoS Attack

Distributed denial of service (DDoS) attack has been existing for many years; it hasn't brought much attention until the mid-February 2000. In a 3 day period (7th - 11th), CNN, Yahoo, E-Bay, Datek had been taken down for several hours at a time due to flooding attack from a computer at California College.

In the early age of DoS attack, it often happens in the IRC, where ones with higher bandwidth kicks others out off the channel by using Ping to Death, SYN flood, or UDP flood. Attack is usually implemented in singletier, i.e. All packets are sent off the wire from attacker's computer.

Smurf is probably the first DDoS tool that utilizes concept of distributed computing; attackers compromise as many under administrated computers as possible to flood a single target. This type of 2-tier attacks are extremely powerful, evne high-end servers could be easily taken down in a minute; it also makes tracing back more difficult.