![]() Hping3 has six modes, the default being TCP mode. However, too fast, and there's a risk of countermeasures being deployed. The faster the packets are sent, the sooner resources become consumed. An important option for testing denial of service is the interval, specified by -I, which determines how fast the packets are sent to the target. If this is omitted, packets will be sent until the tool is terminated with Ctrl+C. The count option, specified by -C or -count, determines how many packets will be sent. ![]() As we can see, hping3 is a multi-purpose network packet tool with a wide variety of uses, and it's extremely useful for testing and supporting systems. I'll open a terminal window and take a look at hping3. The TCP SYN flood happens when this three-packet handshake doesn't complete properly. When the SYN packet arrives, a buffer is allocated to provide state information for the session. The TCP handshake takes a three-phase connection of SYN, SYN-ACK, and ACK packets. We can test resilience to flooding by using the hping3 tool which comes in Kali Linux. ![]() The most common technique used in denial of service attacks is the TCP SYN flood.
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