Hacking Activity: Launch a DOS attack

In this practical scenario, we are going to use Nemesy to generate data packets and flood the target computer, router or server.
As stated above, Nemesy will be detected as an illegal program by your anti-virus. You will have to disable the anti-virus for this exercise.
  • Unzip it and run the program Nemesy.exe
  • You will get the following interface

 Enter the target IP address, in this example; we have used the target IP we used in the above example.
HERE
  • 0 as the number of packets means infinity. You can set it to the desired number if you do not want to send, infinity data packets
  • The size field specifies the data bytes to be sent and the delay specifies the time interval in milliseconds.

Click on send button
You should be able to see the following results



The title bar will show you the number of packets sent
Click on halt button to stop the program from sending data packets.
You can monitor the task manager of the target computer to see the network activities.
  • A denial of service attack’s intent is to deny legitimate users access to a resource such as a network, server etc.
  • There are two types of attacks, denial of service and distributed denial of service.
  • A denial of service attack can be carried out using SYN Flooding, Ping of Death, Teardrop, Smurf or buffer overflow
  • Security patches for operating systems, router configuration, firewalls and intrusion detection systems can be used to protect against denial of service attacks.

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