Protecting DNS Servers from Denial of Service Threats

    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

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