How many types of traffic attacks are there?

DDoS attacks are divided into two types: either big data and large traffic to overwhelm network equipment and servers, or deliberately creating a large number of incomplete requests that cannot be completed to quickly exhaust server resources. The key difficulty in effectively preventing DDoS attacks is the inability to distinguish attack packets from legitimate packets: the typical "signature" pattern matching performed by IDS does not play an effective role; many attacks use source IP address spoofing to escape source identification and are difficult to search Specific source of attack. There are two basic types of DDoS attacks: ●Bandwidth attack: This attack consumes network bandwidth or floods one or more routers, servers and firewalls with a large number of data packets; the common form of bandwidth attack is a large number of apparently legitimate TCP, UDP or ICMP packets are sent to a specific destination; to make detection more difficult, this attack also often uses source address spoofing, which is constantly changing. ●Application attacks: Use behaviors defined by protocols such as TCP and HTTP to continuously occupy computing resources and prevent them from processing normal transactions and requests. HTTP half-open and HTTP errors are two typical examples of application attacks.

What is CC attack and how is it different from DDOS?

DDoS

Full name: Distributed Denial of Service (DDoS: DistributedDenialofService). This attack method exploits the functional defects of the target system's network service or directly consumes its system resources, making the target system unable to provide normal services. services.

The problem of denial of service attacks has not been reasonably solved and is still a worldwide problem. The reason is that it is caused by the security flaws of the network protocol itself.

DDoS attacks target the website's server, while CC attacks target the website's pages.

CC

Full name: ChallengeCollapsar, which means Challenge the Black Hole in Chinese, because the previous security equipment to resist DDoS attacks was called the Black Hole. As the name suggests, Challenging the Black Hole means that the Black Hole is helpless against this kind of attack. The new generation of anti-DDoS equipment has been renamed ADS (Anti-DDoS System), which is basically able to perfectly resist CC attacks.

The principle of CC attack is to simulate multiple users accessing the dynamic pages of the target website through a proxy server or a large number of broilers, creating a large number of background database query actions, consuming the target CPU resources, and causing a denial of service.

Unlike DDOS, which can be filtered by hardware firewalls, CC attacks themselves are normal requests. It is recommended that small and medium-sized websites use static pages to reduce interaction with the database and consume less CPU.

It can be seen from the above analysis that the main difference between DDoS attacks and CC attacks is the target. DDoS is an attack that mainly targets IP, while CC attacks mainly target web pages. Relatively speaking, the CC attack is not devastating, but it lasts for a long time; while the DDoS attack is a traffic attack, which is more harmful. It sends a large number of data packets to the target server, exhausting its bandwidth, and even more Difficult to defend.

After understanding the differences and principles of DDoS attacks and CC attacks, the only thing left is defense. We must know that it is impossible to prevent a website from being attacked, but we can usually take some protective measures to prevent website attacks or reduce the harm caused by website attacks. If the website is small in scale, has very weak defense capabilities, and does not have much capital investment, then choosing ddos.cc is the best choice.

How are DDoS attacks distributed?

The most common network attack method relies on client/server technology to unite multiple computers as an attack platform (small-capital hackers use the Internet to download viruses to invade other people's computers, and in DOS attacks, the intruder will also It has become an attack tool (commonly known as a "meat machine"), thereby exponentially increasing the power of denial of service attacks.

Usually, the attacker uses a stolen account to install the DDoS master program on a computer. At a set time, the master program will communicate with a large number of agent programs. The agent programs have been installed on the network. on many computers.

The agent launches the attack when it receives instructions.

Using client/server technology, the main control program can activate the running of hundreds or thousands of agent programs in a few seconds, causing the attacked server or client to instantly crash and shut down, so DDOS attacks are also It can be simply understood as a large-scale traffic access attack

What is a DDoS attack?

I believe everyone has heard of DoS attacks, DDoS attacks and DRDoS attacks! DoS is the abbreviation of DenialofService, which means denial of service, and DDoS is the abbreviation of DistributedDenialofService, which is distributed denial of service, and DRDoS is the abbreviation of DistributedReflectionDenialofService. In short, this means distributed reflective denial of service

What are the DDoS methods?

Ddos attacks mainly include the following three methods.

High-traffic attacks

High-traffic attacks saturate the network's bandwidth and infrastructure through massive traffic, consuming them all, thus achieving the purpose of flooding the network. Once traffic exceeds the capacity of the network, or the network's ability to connect to the rest of the Internet, the network becomes inaccessible. Examples of high-traffic attacks include ICMP, fragmentation, and UDP flooding.

TCP State Exhaustion Attacks

TCP State Exhaustion attacks attempt to consume the connection state tables present in many infrastructure components, such as load balancers, firewalls, and the application server itself. For example, the firewall must analyze each packet to determine whether the packet is a discrete connection, a continuation of an existing connection, or the completion of an existing connection. Likewise, intrusion prevention systems must track state to implement signature-based packet inspection and stateful protocol analysis. These devices and other stateful devices—including those responsible for the balancer—are frequently compromised by session flooding or connection attacks. For example, a Sockstress attack can quickly flood a firewall's state table by opening sockets to populate the connection table.

Application layer attacks

Application layer attacks use more sophisticated mechanisms to achieve the hacker's goals. Rather than flooding the network with traffic or sessions, an application layer attack targets a specific application/service and slowly exhausts resources on the application layer. Application layer attacks are very effective at low traffic rates, and the traffic involved in the attack may be legitimate from a protocol perspective. This makes application layer attacks more difficult to detect than other types of DDoS attacks. HTTP floods, DNS dictionaries, Slowloris, etc. are all examples of application layer attacks.