A denial-of-service attack is an attempt to make the computer or internet resource unavailable to the intended users. ‘SMURF’ is a well- known type of DoS attack which is based on an attacker’s ability to spoof IP source address. Any system that uses IP address as a means of authentication can be compromised by an attack known as IP address spoofing. The attacker sends a request for return packet to the intermediate network’s broadcast address. From where, the request is automatically relayed to all the machines on the network. These machines then send reply back reply with a return packet. However, in the original attack packet, the attacker replaces his/her own true address with the address of the original victim. The victim machine hence is flooded with many such replies which in turn increase traffic at the victim’s site. Consequently, the target machine is forbid to perform any useful activity.
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