bit numbers for use as source addresses of the attacking packets. In subnet spoofing, the addresses are generated from the address space corresponding to the subnet in which the agent machine resides. In this experiment we used a random IP spoofing scheme to launch the TCP-SYN based DDoS attacks on the victim computers at transmission loads varying from 2Mbps to 100Mbps. Furthermore, the TCP SYN attack was launched on the Telnet port that was open on the victim