Imagine that you manage a restaurant. If several thousand people suddenly tried to enter on the same evening, you would naturally be unable to serve all of them. A similar situation can occur with traffic directed at the servers behind an online business. Extreme request volume can slow a website dramatically or make it unavailable altogether. This type of problem is known as DDoS, or Distributed Denial of Service. Without protection, customers may lose access to information or commercial services, and important website functions may stop working.
Unethical competitors, fraudsters and attackers can use DDoS attacks because they can be relatively easy to launch and difficult to attribute.
The question is how to protect infrastructure from these attacks. Plesk's official materials discuss several approaches.
What is DDoS protection?
DDoS attacks appear in different forms, including volumetric attacks, protocol attacks and application-layer attacks. This means that a DDoS mitigation system must be flexible enough to respond to multiple attack types.
Volumetric and protocol-based attacks attempt to exhaust server and network resources with a very large number of requests. A DDoS protection layer filters illegitimate connections and malicious traffic before they can consume all available resources.
DDoS mitigation services can protect against common attack types such as:
- UDP Flood
- SYN Flood
- SYN-ACK Flood
- ICMP Flood
- DNS Reflection Flood
- Fake sessions
- Spoofed IP traffic
- Misused application attacks
DDoS attacks can create significant financial and operational damage. For that reason, it is important to choose infrastructure and services that protect your resources against multiple types of threats.
Software that detects and analyzes DDoS attacks
Modern DDoS attacks can be sophisticated, and you may not immediately notice the exact moment an attack begins. Delayed reaction usually increases the impact. A suitable DDoS protection system can detect and mitigate malicious traffic rapidly. Some solutions can also analyze attack methodology and provide information that helps prepare for similar incidents in the future.
Traffic can be continuously filtered through a DDoS mitigation layer so that attacks are detected shortly after they begin. The faster a threat is identified and blocked, the better protected your services and data remain.
Without appropriate mitigation tools, a server can remain unavailable for an extended period. This risk exists for businesses of every size, so proactive preparation is recommended.
Server-side DDoS protection
As technology develops, new attack techniques continue to appear, while security vendors also continue improving their defensive tools. New traffic and attack data helps providers study emerging patterns and update detection methods.
Although some people assume that only very large companies are targeted, smaller and newer businesses are also common targets. The relative business impact can be even more severe for organizations with fewer resources, so DDoS planning is not only relevant to established enterprises.
Even a relatively small bot attack can degrade a website without fully taking it offline. Slow performance can still reduce traffic, frustrate visitors and cause customers to move to competitors.
When choosing a service provider, review the scale and type of DDoS protection included in the service rather than assuming all hosting plans offer the same level of mitigation.
Using DDoS protection with Plesk-managed infrastructure
Plesk has long provided server-management tools for system administrators. Combined with a properly configured network security stack, automation and monitoring can simplify many hosting-management tasks.
Third-party DDoS mitigation integrations may also be available for Plesk environments. Before using any specific extension or vendor, verify that it is still supported and suitable for your network architecture.
How DDoS filtering systems generally work
- Incoming traffic passes through filtering systems that analyze requests in near real time.
- Detection algorithms distinguish automated or malicious traffic from legitimate user requests.
- Traffic patterns can be evaluated by IP address and connection behavior.
- Behavioral analysis helps identify suspicious activity.
- Automated bot protection can block malicious requests immediately after they are detected.
- Properly configured mitigation should minimize disruption to legitimate users, who continue using the website normally.