As an alternative or augmentation of a DDoS, attacks may involve forging of IP sender addresses (IP address spoofing) further complicating identifying and defeating the attack.
It also makes it difficult to distinguish legitimate user traffic from attack traffic when spread across multiple points of origin.
Since the incoming traffic flooding the victim originates from different sources, it may be impossible to stop the attack simply by using ingress filtering. Multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. A distributed denial of service attack typically involves more than around 3–5 nodes on different networks fewer nodes may qualify as a DoS attack but is not a DDoS attack. A DDoS attack uses more than one unique IP address or machines, often from thousands of hosts infected with malware. A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers.
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