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Distributed denial of server (DDoS) using spoofed recursive DNS requests are on the rise. These recommendations can help prevent DNS-based attacks, as well as cache poisoning.
Typically, DNS servers only provide DNS services to machines within a trusted domain. Restricting recursion and disabling the ability to send additional delegation information can help prevent DNS-based DoS attacks and cache poisoning. It can also improve performance on your network by reducing the vulnerability of your DNS servers to use as a reflector in such an attack. The following US-CERT recommendations provide guidance on mitigating this threat.
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