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Protecting DNS Servers from Denial of Service Threats

505 KB | 3 files | null PDF

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.

Included in this ZIP file are:

  • Intro Page.pdf
  • Terms and Conditions.pdf
  • The Continuing Denial of Service Threat Posed by DNS Recursion.pdf
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US-CERT is charged with providing response support and defense against cyber attacks for the Federal Civil Executive Branch (.gov) and information sharing and collaboration with state and local government, industry and international partners. US-CERT interacts with federal agencies, industry, the research community, state and local governments, and others to disseminate reasoned and actionable cyber security information to the public.

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