Application DDoS attack principle and defense method

DDoS An attack is a hidden danger , Keep hiding webmasters , And block the access process of the application . Due to damage and shutdown , We have become accustomed to DDoS attack As headlines . however , We often miss some details , These details may suggest how we can avoid such attacks . Warner cloud gives you a brief introduction to the application DDoS The basic attack principle of the attack and its defense methods .

One 、 know OSI Model

In order to grasp all kinds of DDoS attack , First of all, we need to understand how data travels through network connections .OSI Model ( Open Systems Interconnection ) It is the process of negotiating different levels of network connection .OSI The level of the model is as follows ：

• Applications ： Identify partner tiers .

• demonstration ： Usually part of the operating system , Data can be converted into various formats .

• conversation ： establish , Coordinate and terminate the dialogue .

• transmission ： Convert data into packets for easy transmission .

• The Internet ： Handling addressing and routing data .

• Data links ： Establish links across physical networks .

• Physics ： Transport data streams , Also known as bitstream .

please remember , Data from OSI Start at the bottom of the model , All the way to the top . In short , Data will traverse OSI All levels of the model , Until it reaches its intended destination . The top layer communicates only through the lower layer , Until the data request is completed . Whenever you click Web When the link on sends a request , These connections are made at lightning speed . If data is lost at any level , Then the connection will terminate and the connection will be lost .DDoS Attacks are designed to disrupt these levels of communication , Thus flooding the network and terminating the connection .

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Two 、 In the first 7 layer ： Application level attacks

Although there are various DDoS attack , But the application layer ( That is to say 7 layer ) Attacks surge . If you view the above OSI Model , be “ Application level ” Is the top of the data connection . This type of DDoS Attacks are often much more complex , And it needs less resources to destroy the connection of the target website . Because less resources are needed , So the first 7 The creation cost of layer attack is low . And due to various interference sources , They are also difficult to mitigate .

The first 7 Layer attacks may cause websites to crawl slowly , And often take them completely offline . When an attacker aims to pass through a large number of HTTP Request to utilize system resources , A shutdown will occur . Zombie programs and infected computer systems will be single HTTP The request is sent to the target network . One HTTP The request is very easy to resolve , however , When requests are made quickly and continuously , The network will soon be overloaded .

Warner cloud CDN Expert tips ,“ To resist 7 layer DDoS The only way to attack is , Applications and websites need to upgrade their networks to handle the load .” This translates into an increase in server level resources and redundancy . about V/P/S trusteeship , Many administrators will scale up and add additional nodes , To ensure that large-scale DDoS The connection will not be lost during the attack . In order to protect your website from the 7 layer DDoS A serious attack , Warner cloud launched advanced anti DDoS server in Hong Kong 、 Hong Kong advanced defense IP And other products and services , They are based on automatic intelligent attack identification and second level trigger cleaning mechanism , Finally, large-scale DDoS The effect of attack defense . Warner cloud advanced anti DDoS server in Hong Kong and advanced anti DDoS in Hong Kong IP, Support defense beyond 500Gbps A serious attack of scale , Can ensure that the website /web Apps are always online . Its advanced anti DDoS server in Hong Kong supports stress testing , Support defense against invalid refund commitments . Its Hong Kong advanced defense IP, Just put your website / Off site web Application resolution to advanced anti DDoS IP Can be in 5 Get defense support quickly in minutes , And no matter http still https Websites are perfectly defensible .