Distributed denial of service (DDoS) attacks are a subclass of denial of service (DoS) attacks. A DDoS attack involves multiple connected online devices, collectively known as a botnet, which are used to overwhelm a target website with fake traffic.
In general, DDoS is indicated when the frequency of the requests incoming from a botnet becomes comparable with a reliable system response to a single request for connection. Let's say the system reliable connection time is 1 millisecond (1 kHz). If the amount of incoming requests for connection is near or above 1,000 per one second (1 kHz ), the attack registration can begin. It's just a basic rough idea. There are many things to check yet. For instance, the DDoS detection system ought to make sure it's not a random load peak but a consistent DDoS attack, whether or not it's enough time and resources for automatic deployment of additional / reserved network/compute resources to suppress the attack, etc.
In real time DDoS, this system periodically samples every single IP user's sending and receiving traffic and judges whether its traffic behavior meets the desired or intended threshold or not. If it meet the desired permissible threshold then it will be treated as normal otherwise an attack.
1. S-DDoS: Apache spark based real-time DDoS detection system
https://content.iospress.com/articles/journal-of-intelligent-and-fuzzy-systems/ifs179733
2. A real-time DDoS attack detection and prevention system based on per-IP traffic behavioral analysis
https://ieeexplore.ieee.org/document/5563549
I suggest reading some article
https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=real+time+DDoS+attack&btnG=
It is all about setting a threshold on the overall distributed system response time. Variation in this response time is already the first call of concern. This may not be related to a DoS directly, but the alert is efficient enough to detect the attack before the distributed performance becomes poor enough to put the system down. It is important to note that attack can take place at any level of the network Hierarchy. we can therefore not have an All-effective real-time DDoS attack detection system, but rather focus detection at each level( Access, Distribution, Core, Application), in consideration of specificity assocatiated at each stage and network goal to achieve. However, no matter the case, monitoring of the Overall System Response Time versus acceptable Threshold peer security layer is acceptable enough to act as a DDoS attack detection technic for a given system.
Standing on the reality of information technology used in the security services. Physical components Software She chooses to use computers for workers
Defending Web Servers Against Flash Crowd Attacks
https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=defending+web+servers+against+flash+crowd+attacks&btnG=
https://ieeexplore.ieee.org/document/8888105
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