UDP flood: with these attacks, cyber criminals rely on the connectionless User Datagram Protocol (UDP).If a large number of these half-opened connections meet due to SYN flooding, the available server resources will be completely used up. If this last step fails to happen, the system will be paralyzed since the server doesn’t have a final confirmed connection to store in the working memory. The connection process is then ended with a client-side confirmation (ACK).
This is then received by the server, which acknowledges the request with its own synchronization packet (SYN) as well as a confirmation (ACK). A TCP connection is always made in a three-step authentication process, which starts with the client sending the server a synchronization packet (SYN). TCP (Transmission Control Protocol) is a network protocol that, together with an IP, ensures smooth data traffic flow over the internet. SYN flood: this attack abuses the TCP three-way handshake connection.Since these requests (ping) have to be answered with a data packet from the target system (pong), slow systems end up being thwarted by a ping flood. These requests are usually sent by botnets on a massive scale. Ping flood: when it comes to this type of attack, cyber criminals overload the server with ICMP Echo Request packets.To do this, they simply have to access any pages of the target project until the server collapses from the amount of requests. The attacker floods the target’s web server with a large number of HTTP requests. HTTP flood: this is the simplest DDoS resource overload attack variant.Classic DDoS attack patterns on system resources are ping flood, SYN flood, and UDP flood. If these are used for invalid requests, the server will be effectively blocked for regular users. A large network with many devices connected to it can therefore massively impair the target’s bandwidth.Ī DDoS attack targets the resources of a system this way, attackers exploit the fact that the web server can only establish a limited number of connections. The broadcast request is then forwarded from the network router to all connected devices, which causes them all to send a response to the sender address (Pong).
The attacker sends manipulated ICMP Echo Request packets (Ping) to the broadcast address of a network and uses the target’s IP address as the sender address. Smurf attack: this DDoS attack takes advantage of the Internet Control Message Protocol (ICMP), which helps the exchange of information and error reports in computer networks. A typical DDoS attack designed for overloading bandwidth is the Smurf attack. If this capacity is exceeded due to an attack, the corresponding services will no longer be available to other users. A router can only process a certain amount of data at once. DoS and DDoS attacks directly target networks and their respective connecting device. The aim of overloading the bandwidth is to make a computer inaccessible.
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