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Protecting DNS Servers from Denial of Service Threats

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.


505 KB | 3 files | null PDF

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.

Included in this ZIP file are:

  • Intro Page.pdf
  • Terms and Conditions.pdf
  • The Continuing Denial of Service Threat Posed by DNS Recursion.pdf