A distributed denial of service (DDoS) attack is a malicious attempt to disrupt the target server, service, or normal communication on the network by overloading the target or its surrounding infrastructure with Internet traffic. Computer systems hacked are the source of attack traffic. Computers hacked include computers and other network resources, such as IoT devices. At a higher level, a DDoS attack is like an accidental traffic jam, blocking the road and preventing normal traffic from reaching your destination.
How does a DDoS attack work?
DDoS attacks are carried out on computer networks connected to the Internet. These networks consist of computers and other devices (such as IoT devices) infected with malware, so they can be controlled remotely. These individual devices are called bots (or zombies), and a group of bots is called botnets. ...Once the botnet is created, the attacker can direct the attack by sending remote commands to each botnet. When a botnet attacks the victim's server or network, each bot will send a request to the target's IP address. This may overload the server or the network and cause the denial of normal traffic services.Since every bot is a legitimate Internet device, it is difficult to distinguish attack traffic from regular traffic.
How to identify DDoS attacks
The most obvious sign of a DDoS attack is a sudden slowdown or unavailability of a site or service. -This reasonable increase in traffic may cause similar performance problems. Therefore, further investigation is usually required.
Using traffic analysis tools, you can find some obvious signs of DDoS attacks: suspicious traffic from a single IP address. Or IPA user traffic flows share a single behavior profile, such as device type, geographic location, or web browser version. Requests for specific pages or endpoints have increased inexplicably.
It looks unnatural (every 10 minutes). There are other more specific signs of a DDoS attack, depending on the type of attack. Different types of DDoS attacks target different components of the network connection. To understand how different DDoS attacks work, you need to know how to establish a network connection.
Network connections on the Internet consist of many different components or "layers." Just like building a house from scratch, each layer of the model has its own purpose. Although almost all DDoS attacks will overload the data traffic of the target device or network, the attacks can be divided into three categories: the attacker can use one or more different attack vectors or attack cycles in response to the response measures taken to achieve the target.
Attack (belonging to the seventh level of the OSI model). The purpose of these attacks is to exhaust the target's resources to create a denial of service. The goal of the attack is to create a web page on the server and provide a level of service in response to HTTP requests.
Creating a single HTTP request on the client is computationally expensive, but for the target server, the response may be expensive, because the server usually downloads multiple files and requests data to create a web page.
Layer 7 attacks are difficult to defend because it is difficult to distinguish malicious traffic from legitimate traffic.
HTTP floods. In this attack, updates are downloaded multiple times to many different computers simultaneously in a web browser. A large number of HTTP requests flooded the server and caused a denial of service.
This type of attack ranges from simple to complex. The deployment can access URLs that have the same IP range as the attacker, sender, and user agent.
The sophisticated version can use a large number of attacking IPs and use random senders and user agents to locate random URLs.
The target of protocol attacks: Protocol attacks, also known as brute force attacks, cause service interruption due to excessive consumption of server resources and/or network equipment resources such as firewalls and load balancers.
Protocol attacks use weaknesses in the third and fourth layers of the protocol stack to make the target unreachable.
The SYN process is similar to receiving inquiries from employees of the purchasing department from the front desk of a store. After the employee receives the request, he picks up the package and waits for confirmation, and then puts the package to the front desk.
Then, the workers got more. Unconfirmed package requests until they no longer carry packages because
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