How does DDOS resist attacks? Step-by-step implementation tutorial sharing

at the moment of high-speed operation of digital business, network attacks have become a major threat to the stable operation of enterprises. Among them, DDOS attacks often leave many enterprises helpless due to their wide range of attacks and strong destructive power. Although many enterprises know the importance of DDOS to resist attacks, they do not know how to implement protection strategies. This article will dismantle the whole process implementation steps of DDOS to resist attacks from multiple dimensions such as pre-preparation, technical deployment, and daily operation and maintenance, and provide enterprises with a set of practical guidelines that can be directly referred to. Help enterprises build a solid network protection barrier.

1. What pre-evaluation should be done before DDOS resists attacks?

want to effectively land DDOS to resist attacks, the early comprehensive assessment is the basis, only clear their own protection needs and risk points, follow-up protection measures can be accurate and effective.

1, business system asset sorting

enterprises need to comprehensively sort out all their business system assets, including key resources such as core servers, internet bandwidth, domain names, API interfaces, etc., to clarify the business value and carrying capacity of each asset. For example, the order server of the e-commerce platform and the trading system of the Financial Institution Group. These core assets are high-frequency targets of DDOS attacks, and they are also key protection objects for DDOS to resist attacks. Only by sorting them out can we allocate protection resources in a targeted manner.

2, attack risk and threshold measurement

combine business scale and industry characteristics to calculate the attack threshold they can withstand, and analyze whether they have encountered DDOS attacks in the past, the type and scale of attacks, and refer to attack cases in the same industry to estimate the possible attack intensity. For example, the bandwidth of small and medium-sized enterprises is usually between 100M-1G, and the corresponding DDOS attack resistance threshold should be set within a reasonable range to avoid waste or insufficient protection resources.

2. How to deploy the core technology of DDOS to resist attacks?

completed the preliminary evaluation, it will enter the core technology deployment stage of DDOS to resist attacks, which is a key link in building a protective barrier and needs to combine a variety of technical means to form a collaborative protection.

1, flow cleaning and diversion technology

traffic cleaning is one of the core means of DDOS attack, enterprises can deploy professional traffic cleaning equipment or access to cloud traffic cleaning services, all incoming network traffic first into the cleaning center, through feature identification, behavior analysis and other technologies to screen out malicious traffic and intercept, the normal traffic will be forwarded to the business system. At the same time, through multi-line shunt technology, user traffic in different areas is allocated to different bandwidth lines to avoid single-line attack paralysis.

2, access control and authentication mechanisms

deploy access control policies at the front end of the business system, such as setting up IP black and white lists to directly intercept IPs that frequently initiate abnormal requests; introduce mechanisms such as CAPTCHA verification and device fingerprint identification to verify users suspected of malicious requests twice to avoid automated attack tools from initiating requests in batches. These mechanisms can filter out some malicious requests at the traffic entrance and reduce the pressure on subsequent DDOS to resist attacks.

III. How to carry out the daily operation and maintenance of DDOS against attacks?

DDOS defense against attacks is not a once-and-for-all deployment, daily continuous operation and maintenance can ensure the long-term effectiveness of the protection system and timely response to new attack methods.

1, dynamic adjustment of protection strategy

with the change of business scale and the iteration of attack technology, enterprises need to regularly adjust the DDOS strategy to resist attacks dynamically. For example, during the period of e-commerce promotion, business traffic will increase significantly, and it is also the high incidence period of DDOS attacks. At this time, it is necessary to temporarily increase the threshold of traffic cleaning, relax the verification rules of some normal requests, and avoid intercepting normal users by mistake.

2, real-time monitoring of system status

build a comprehensive network monitoring system, real-time monitoring of server CPU, memory, bandwidth usage, as well as request response time, abnormal request ratio and other indicators. Once abnormal indicators are found, such as bandwidth suddenly occupied, the request volume far exceeds the normal level, the monitoring system needs to issue an alarm in time, operation and maintenance personnel can intervene in the first time to check, confirm whether to encounter DDOS attacks, start the corresponding DDOS anti-attack plan.

IV. How to build DDOS emergency response against attacks?

even if the early protection and daily operation and maintenance, may still encounter sudden DDOS attacks, so the construction of a sound emergency response mechanism is an important supplement to the DDOS attack system.

1 Emergency response plan

enterprises need to develop a detailed DDOS anti-attack emergency response plan to clarify the disposal process corresponding to different attack levels and the division of responsibilities of each position. For example, when encountering mild attacks, the operation and maintenance team will independently start traffic cleaning and IP interception; when encountering large-scale attacks beyond their own protection capabilities, they need to immediately contact Cloud as a Service provider or professional security agencies for support, and notify the business department to prepare for user notification and business degradation.

2, review and optimization after the attack

each DDOS attack disposal is completed, it is necessary to carry out the review work in time, analyze the type of attack, attack path, and the effectiveness of protection measures, and find out the shortcomings in the process of this DDOS attack resistance. For example, if a new type of attack method is found to bypass the existing protection strategy, it is necessary to timely update the protection rules, optimize the subsequent DDOS attack defense scheme, and improve the ability to deal with similar attacks.

To sum up, the implementation of DDOS attack resistance is a systematic project, which needs to be advanced from pre-assessment, technical deployment, daily operation and maintenance to emergency response. Only by building a complete protection system covering pre-event, in-event and after-event can enterprises effectively respond to various DDOS attacks, ensure the stable operation of business systems, and build a secure foundation for the development of digital business.