DDoS attack refers to the use of a large number of computers or network devices to initiate a large number of requests to the target host or server, so that the target host or server cannot respond to network requests normally due to resource exhaustion. How to prevent ddos ​​attacks on the server when facing attacks is a problem we continue to solve.

　　How to prevent ddos ​​attacks on the server

　　The principle of DDoS attack is based on the network transmission protocol. It uses the limitations of the network bandwidth and processing power of the target host or server to send a large number of malicious requests to the target, making it unable to respond to legitimate requests normally, or causing the network connection or even hardware system of the target host or server to crash. Attackers usually use a variety of different technologies and means, such as reflection attacks, amplification attacks, distributed attacks, etc., to achieve the purpose of the attack.

　　1. Ensure the security of the server system

　　First, make sure that the server software has no vulnerabilities to prevent attackers from invading. Make sure that the server uses the latest system and applies security patches. Delete unused services on the server and close unused ports. For websites running on the server, make sure they have the latest patches and no security vulnerabilities.

　　How to prevent DDOS attacks on servers

　　2. Hide the real IP of the server

　　Add CDN transit to the front end of the server. If you have sufficient funds, you can buy a high-defense shield machine to hide the real IP of the server. The domain name resolution uses the IP of CDN, and all resolved subdomains use the IP address of CDN. In addition, other domain names deployed on the server cannot use real IP resolution, and all use CDN to resolve.

　　In addition, to prevent the server from transmitting information to the outside, the most common thing is that the server does not use the send email function. If you have to send an email, you can send it through a third-party agent (such as sendcloud), so that the IP displayed to the outside is the agent's IP.

　　3. Back up data regularly

　　Use tapes to save precious data, but data backup also has huge security vulnerabilities, so the backup medium should also be effectively protected during backup.

　　4. Strengthen the security level of the server's local file format

　　In short, as long as the real IP of the server is not leaked, it doesn't cost much to prevent small traffic DDOS below 10G, and free CDN can handle it.

　　5. High-defense CDN

　　Using a CDN network can help reduce the load on the server and reduce the impact of DDoS attacks. High-defense CDN can also optimize its strategy to deal with specific types of DDoS attacks. For example, it can adopt a layered defense strategy and mitigate attacks by setting current limits, blacklists, and whitelists. Using high-defense CDN to defend against DDoS attacks is very effective. They can not only defend against attacks, but also optimize performance and increase website speed.

　　How to defend against DDoS attacks on servers? The above is the full answer. The high-defense DDoS server finds malicious attacks and blocks the server, which has a good effect in defending against DDoS. Server DDoS attacks may cause long-term service interruptions, damage business and reputation, so it is important to do a good job of DDoS attack protection in a timely manner.