The similarities and differences between dos and ddos: 1. Different natures, DoS is a denial of service, and DDOS is a distributed denial of service; 2. Different attack methods, DoS is a bandwidth consumption attack, and DDOS system resource consumption attack; 3 , defense methods are different, DoS requires active and careful maintenance of the system, DDOS can be prevented by setting the filtering function of the router.
The similarities and differences between dos and ddos:
1. Different properties
DoS is the abbreviation of Denial of Service, which means denial of service. The attack behavior that causes DoS is called a DoS attack. Its purpose is to prevent the computer or network from providing normal services. The most common DoS attacks include computer network broadband attacks and connectivity attacks.
DDOS is the abbreviation of (Distributed Denial of Service), that is, distributed denial of service. Hackers use DDOS attackers to control multiple machines to attack simultaneously to achieve the purpose of "impeding normal users from using services", so that A DDOS attack was formed.
2. Different attack methods
Representative DoS attack methods include PingofDeath, TearDrop, UDPflood, SYNflood, LandAttack, IPSpoofingDoS, etc.
The obvious characteristic of a victim host under a DDoS attack is that a large number of unknown data packets flow to the victim host, the victim host's network access bandwidth is exhausted, or the victim host's system resources (storage resources and computing resources) It is heavily occupied and even crashes. The former can be called a bandwidth consumption attack, and the latter is a system resource consumption attack. Both may occur separately or simultaneously.
3. Different defense methods
To prevent the system from DoS attacks, network administrators must actively and carefully maintain the system. Ensure that there are no security risks and vulnerabilities; as for the third malicious attack method, you need to install firewalls and other security devices to filter DoS attacks. It is also strongly recommended that network administrators should check the logs of security devices regularly to discover security threats to the system in a timely manner. .
Some DDoS will disguise the source of the attack and forge the source IP of the packet, making it difficult to trace. This part can be prevented by setting the filtering function of the router, as long as the source of the packet in the network domain is outside the network domain. IP, the packet should be discarded directly instead of sent out again. If the network management equipment supports this function, the network management personnel can correctly set up to filter out the fake packets, which can also greatly reduce the time of investigation and tracking.
It is very important to maintain communication between network domains so as to effectively early warn and prevent DDoS attacks. Some ISPs will place sensors on some network nodes to detect sudden huge traffic to provide early warning and isolation. DDoS victim area to reduce customer victimization.
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