In a DNS Flood, attackers use DNS as a variant of a UDP flood. Attackers send valid but spoofed DNS request packets at a very high packet rate and from a very large group of source IP addresses. Since these appear as valid requests, the victim’s DNS servers proceeds to respond to all requests. The DNS server can be overwhelmed by the vast number of requests. This DNS attack consumes large amounts of network resources that exhaust the DNS infrastructure until it goes offline, taking the victim’s Internet access (www) down with it.
