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A denial-of-service attack (DoS attack) or
distributed denial-of-service attack (DDoS attack) is an attempt to make a
computer resource unavailable to its intended users.
The attacker concentrates on:
1. Consumption of computational resources, such as bandwidth, or processor
time.
2. Disruption of configuration information, such as routing
information.
Examples:
Ping flood
is based on sending the victim a number of ping packets,
usually using the "ping" command from unix-like hosts .
Ping broadcast
A ping
request packet is sent to a broadcast network address where there are many
hosts. The source address is shown in the packet to be the IP address of the
computer to be attacked. If the router to the network passes the ping
broadcast, all computers on the network will respond with a ping reply to the stacked
system. The attacked system will be flooded with ping responses which will
cause it to be unable to operate on the network for some time, and may even
cause it to lock up.
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