hping is a free packet generator and analyzer for the TCP/IP protocol distributed by Salvatore Sanfilippo. Hping is one of the de facto tools for security auditing and testing of firewalls and networks, and was used to exploit the idle scan scanning technique (also invented by the hping author), and now implemented in the Nmap. open terminal command : root@agasvcn:/home/agasvcn# sudo apt-get update root@agasvcn:/home/agasvcn# sudo apt-get install hping3