It is a malicious attack technique that attempts to disable normal service targeting a specific server. By inducing continuous traffic to a specific server, the attacker paralyzes the server by generating resources that the server cannot handle. When using a PC at home or at work, there are cases where the PC suddenly slows down or freezes. In other words, when a request that exceeds the capacity of the central processing unit (CPU) or main memory built into the PC occurs, the PC cannot handle it due to overload and slows down or stops. It is necessary to manage servers and PCs safely by utilizing methods to protect against, cope with, and prevent such DDoS attacks.
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| DDoS protection and prevention |
□ How to protect against DDoS attacks
To protect against DDoS attacks, you can consider the following methods.
▶ Traffic filtering
Detect and block abnormal traffic using network equipment or firewalls. This allows you to block malicious traffic and maintain system performance.
▶ Load Balancing
Distributing traffic to multiple servers using a load balancer. This can mitigate attacks focused on a single server.
▶ Bandwidth Expansion
Work with your Internet Service Provider (ISP) to extend your bandwidth. Increasing bandwidth can reduce the impact of DDoS attacks.
▶ Captcha (anti-automation)
Introduce CAPTCHA to confirm that the user is human. This makes attacks by automated bots difficult.
▶ Intelligent traffic analysis
It introduces an intelligent traffic analysis system that monitors traffic and identifies normal and unusual traffic patterns. This allows malicious traffic to be detected and blocked.
▶ CDN (Content Delivery Network)
Distribute traffic to multiple regions using a CDN. This can prevent attacks from being concentrated in a specific area and improve bandwidth efficiency.
▶ Rapid response
When a DDoS attack is detected, you must respond quickly. Countermeasures may include traffic redirection, IP blocking, filtering rule updates, and the like. To this end, it is important to prepare a response strategy in advance and form a response team.
▶ Cloud-based protection service
You can utilize the DDoS protection service of your cloud service provider.
□ How to prevent and respond to DDoS attacks
A DDoS (Distributed Denial of Service) attack is an attack that uses multiple computers to simultaneously send a large amount of data packets to a target server in order to disrupt Internet services.
How to prevent and deal with DDoS attacks is as follows.
▶ Using DDoS defense system
DDoS protection systems protect servers by blocking packets that overload the network and filtering the attacker’s IP address. These systems are generally capable of handling large-scale DDoS attacks.
▶ Secure bandwidth
Sufficient bandwidth is required to cope with DDoS attacks. Insufficient bandwidth can cause attack packets to be blocked on the network before reaching the server. However, since a DDoS attack can occur even if sufficient bandwidth is secured, it is recommended to use a DDoS protection system together.
▶ Using cloud-based services
Cloud-based services are usually equipped with several technologies to combat DDoS attacks. Using a cloud-based service, you can protect your server from DDoS attacks and respond to large-scale DDoS attacks.
▶ Active monitoring
Be prepared to actively monitor traffic generated by networks and servers to quickly detect and respond to attack patterns. You can use monitoring tools to maintain real-time protection for your servers and receive alert messages that detect anomalous behavior.
▶ Active response
When a DDoS attack occurs, it is important to respond quickly. To do this, a response plan must be drawn up in advance, and an effective response method must be determined by communicating with the team members. Also, it is a good idea to protect your server by blocking the IP address of the attacker or filtering the traffic.
□ How to prevent DDoS attacks
Attacks are hard to block, so you need to focus on defusing them. Taking precautions can ensure that legitimate visitors are not inconvenienced.
▶ Application front-end hardware
The packets flowing into the system are carefully examined and managed according to the threat level.
▶ Application-level KCI (Key Completion Indicator)
Determines whether a large amount of incoming traffic is legitimate or part of a double attack. Determine the capacity accordingly.
▶ DDS
Resolve protocol attacks and volumetric attacks by identifying problems early and using devices that respond without user intervention.
▶ Firewall
It inserts a layer of protection between the internet and your servers. Filter requests with custom rules, or use simple rules to block all incoming traffic from attackers.
▶ Speed limit
Defines the number of times a user can connect to the server during a specific time period. Some users say that these services are “unfair” to heavy users of the site. However, it can be effective in preventing attacks.
Create a dedicated team to review useful options, and have all team members ready to assist in the event of an attack. Strong planning and communication techniques are effective in responding quickly when problems arise.
