How to detect DDoS attack?

Started by arthyk, Nov 18, 2022, 06:17 AM

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arthykTopic starter

Detecting a DDoS attack on your website can be difficult if you lack experience and specialized software skills. However, certain indicators may suggest a high probability of such an attack. At times, intentional DDoS attacks may be mistaken for a surge in visitors, which can cause a website to function improperly.

To pinpoint the root cause of a sudden increase in visits, you should investigate whether any advertising campaigns or links to your site have been shared on popular resources. If neither has occurred, then proceed with caution.

Despite the confusion, a significant server slowdown and numerous similar requests from client IP addresses may be signs of a DDoS attack. These requests typically come from the same set of addresses and could number tens of thousands during large-scale attacks.

A skilled specialist can quickly confirm malicious activity not only by assessing the volume of certain packet types but also by analyzing traffic to identify the geographical source of the attack.
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Indicators of a DDoS attack include increased network load, traffic volume to connection ports, slow site speed, errors 502, 503, 504, a dramatic increase in processor and RAM load, multiple requests to databases or internal services, and unrelated user requests.

To detect DDoS attacks, website owners regularly monitor traffic and analyze anomalies with automatic systems like firewalls. Monitoring response time can also help detect site slowdowns and server overloads while setting up automatic attack notification alerts through SMS, emails, or messaging apps effectively detects suspicious activity.

Experts recommend a comprehensive approach to detecting DDoS, including manual and automatic monitoring and traffic analysis.

To mitigate DDoS attacks, experts suggest caching content to improve performance and reduce the load on sites. They also advise configuring rate limiters to set the maximum number of incoming connections per second and adding limit zones to block traffic flow where needed. Additionally, subscribing to a reliable DDoS protection service is always helpful.


monitoring network traffic patterns can help detect anomalies that may indicate a DDoS attack. Rapid fluctuations in incoming and outgoing traffic levels, along with an unusually high number of connection requests, can be indicators of an ongoing attack.

Another sign to look out for is a sudden increase in server resource utilization. If your server's CPU, memory, or bandwidth usage spikes significantly without any legitimate reason, it could be a result of a DDoS attack.

Furthermore, examining server logs can provide valuable information about the nature of the traffic hitting your website. Look for patterns such as an unusually high number of requests for specific URLs or repeated failed login attempts from multiple IP addresses.

To effectively mitigate a DDoS attack, it's essential to have dedicated DDoS mitigation services or tools in place. These specialized solutions can help filter out malicious traffic and allow legitimate visitors to access your website unhindered.

In summary, detecting a DDoS attack involves analyzing network traffic patterns, monitoring server resource utilization, examining server logs, and utilizing specialized DDoS mitigation services or tools. By promptly identifying and mitigating these attacks, you can minimize the impact on your website's availability and performance.


Detecting a DDoS (Distributed Denial of Service) attack involves monitoring network traffic for sudden and significant spikes in requests from multiple sources to a targeted server or website. Indicators such as a sharp increase in traffic, unusually high server resource utilization, or a sudden drop in website responsiveness can signal a possible DDoS attack. Implementing traffic analysis tools, anomaly detection systems, and rate limiting measures can aid in identifying and mitigating DDoS attacks promptly.