This enables them to evade traditional, or manual, approaches to mitigation, as the increase in traffic to any single IP address is much less significant and, hence, more difficult to detect.Īnother possible way of taking advantage of DNS flood is through attackers spoofing a victim’s DNS infrastructure and through the use of Open Recursive DNS servers and extensions to the DNS protocol. Attackers use their DDoS vector(s) of choice, but then distribute them over hundreds or even thousands of destination IP addresses. Otherwise known as ‘spread spectrum’ or ‘subnet’ DDoS attacks, these target a range of addresses or entire subnets, rather than a single IP address. The ACK (or ACK-PUSH) flood exhausts a victim’s firewalls by forcing state-table lookups and servers by depleting their system resources used to match these incoming packets to an existing flow. In an ACK flood attack or ACK-PUSH Flood, attackers send spoofed ACK (or ACK-PUSH) packets at very high packet rates that fail to belong to any current session within the firewall’s state-table and/or server’s connection list.
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