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Do You Know How is ICMP used in DDoS attacks?



As we have already seen that What ICMP is with our previous bug, if you still do not read at just click on ICMP.

How is ICMP used in DDoS attacks?


ICMP flood attack


A ping flood or ICMP flood is when the attacker attempts to overwhelm a targeted device with ICMP echo-request packets. The target has to process and respond to each packet, consuming its computing resources until legitimate users cannot receive service.



Ping of death attack


A ping of death attack is when the attacker sends a ping larger than the maximum allowable size for a packet to a targeted machine, causing the machine to freeze or crash. The packet gets fragmented on the way to its target, but when the target reassembles the packet into its original maximum-exceeding size, the size of the packet causes a buffer overflow.


The ping of death attack is largely historical at this point. However, older networking equipment could still be susceptible to it.

Smurf attack


In a Smurf attack, the attacker sends an ICMP packet with a spoofed source IP address. Networking equipment replies to the packet, sending the replies to the spoofed IP and flooding the victim with unwanted ICMP packets. Like the 'ping of death,' today the Smurf attack is only possible with legacy equipment.


ICMP is not the only network layer protocol used in layer 3 DDoS attacks. Attackers have also used GRE packets in the past, for instance.


Typically, network layer DDoS attacks target networking equipment and infrastructure, as opposed to application layer DDoS attacks, which target web properties. Cloudflare Magic Transit is one way to defend against network layer DDoS attacks.



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