What should I do about DDOS attacks? Full analysis of common DDOS protection measures

in the digital age, the stability of network services is directly related to enterprise operations and user experience, but the emergence of DDOS attacks has become a major threat. Such attacks crowd out target internet bandwidth and consume server resources through massive false requests, resulting in legitimate users unable to access services normally, and even cause system paralysis. Many enterprises and individuals are often at a loss when they encounter DDOS attacks. This article will comprehensively dismantle practical solutions to deal with DDOS attacks from attack identification, basic protection, advanced means to emergency response, and help everyone build cyber security defenses.

How to quickly identify DDOS attacks?

timely identification of DDOS attacks is a prerequisite for protection, and only by accurately judging the type and scale of attacks can we take targeted countermeasures.

1, abnormal flow monitoring

real-time observation of bandwidth occupancy through network traffic monitoring tools. If the bandwidth usage rate soars to more than 90% in a short period of time, and the traffic source is scattered and irregular, there is a high probability of a DDOS attack. At the same time, the server CPU and memory occupancy rate suddenly remain high, and the delay of legitimate request response exceeds 5 seconds, which may also be an abnormal performance caused by the attack.

2, request characterization

check the server access log, if you find a large number of requests from the same IP segment or without a valid identifier, and the request content is repeated, lack of behavioral logic of legitimate users, such as frequent refresh of the same page, submit invalid forms, such characteristics also point to DDOS attacks. In addition, if the DNS server receives far more than the daily volume of resolution requests, it may also be a DDOS attack against the domain name.

What are the basic protection measures for DDOS attacks?

basic protection is the first line of defense against DDOS attacks, mainly from network architecture optimization and conventional configuration to reduce the risk of being attacked.

1, network architecture optimization

use load balancing technology to disperse server pressure and distribute user requests to multiple server nodes to avoid a single node being directly destroyed by DDOS attacks. At the same time, reasonably configure firewall rules to limit the request frequency of a single IP, such as setting no more than 100 requests per minute to filter out some malicious traffic.

2, server security configuration

shut down unnecessary ports and services on the server to reduce the attack surface; regularly update the operating system and application patches to fix vulnerabilities that may be exploited; enable the server's connection limit function to avoid a large number of invalid connections exhausting system resources. These basic configurations can effectively reduce the success rate of DDOS attacks.

3. What are the advanced protection methods for DDOS attacks?

faced with large-scale, compound DDOS attacks, basic protection is often difficult to resist, the need to use professional advanced means to improve protection capabilities.

1, use high anti-IP service

high anti-IP service filters malicious traffic through the cleaning center with large bandwidth, replaces the IP of the target server with high-anti-IP, and all requests are cleaned by high-anti nodes first, and only legal traffic is forwarded to the source server. This kind of service can easily resist T-level DDOS attacks, suitable for e-commerce, finance and other enterprises with high requirements for network stability.

2 Deploy CDN to accelerate node

CDN nodes are distributed all over the world, can cache static resources to edge nodes, and user requests are directly obtained from the nearest nodes, which not only improves access speed, but also disperses the pressure of DDOS attacks. When encountering a DDOS attack, the attack traffic will be dispersed to multiple CDN nodes to avoid centralized impact on the source server. At the same time, the traffic cleaning function of the CDN can also filter some malicious requests.

How to deal with DDOS attacks?

even if you are prepared for protection, you may still encounter sudden DDOS attacks. At this time, scientific emergency response can minimize losses.

1, Quickly isolate attack traffic

immediately enable the emergency traffic cleaning rules through the firewall or high-defense IP node, add the identified malicious IP segment to the blacklist, and block its access request. If the scale of the attack is large, the DNS resolution can be temporarily adjusted to direct the traffic to the backup server or CDN node to ensure the normal operation of the core service.

2, linkage service providers collaborative disposal

contact the network service provider and Cloud as a Service provider as soon as possible to inform the situation and scale of the DDOS attack, and request assistance to upgrade the protection strategy, such as temporarily increasing the bandwidth quota and opening the advanced traffic cleaning mode. At the same time, the attack log and traffic data are retained to provide a basis for subsequent traceability and accountability.

To sum up, dealing with DDOS attacks is a systematic project from identification to protection to emergency response. First, quickly identify DDOS attacks through traffic monitoring and request analysis, and then use infrastructure optimization, high-defense IP, CDN and other multi-layer protection methods to build a strong defense line. Isolate traffic and contact service providers in time when attacked. Only by building a complete system of "prevention-protection-emergency" can we effectively resist DDOS attacks and ensure the continuous stability of network services.