hping

Hping is a free TCP/IP packet generator and analyzer created by Salvatore Sanfilippo (also known as Antirez) that is similar to the ping utility; however, it has more functionality than the sending of a simple ICMP echo request that ping is usually used for. Hping can be used to send large volumes of TCP traffic at a target while spoofing the source IP address, making it appear random or even originating from a specific user-defined source.

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