Denial of Service (DoS) guidance collection

Created:  31 Jan 2018
Updated:  16 Mar 2018
Guidance to help organisations understand and mitigate against DoS attacks.

Welcome to the NCSC's guidance on denial of service (DoS) attacks. Here, we'll be explaining what denial of service attacks are as well as suggesting some steps that can be taken to prepare for such an attack.

Understanding denial of service (DoS) attacks

  1. Understanding denial of service (DoS) attacks

    An introduction to denial of service (DoS) attacks.

Preparing for denial of service (DoS) attacks

  1. Preparing for denial of service (DoS) attacks

    It is not possible to fully mitigate the risk of a denial of service attack affecting your service, but there are some practical steps that will help you be prepared to respond, in the event your service is subjected to an attack.

  2. DoS Guidance - Understand your service

    Understand the points in your service where resources can be overloaded or exhausted. Determine whether you, or a supplier, are responsible for each.

  3. DoS Guidance - Upstream defences

    Ensure your service providers are ready to deal with resource exhaustion in places where they are uniquely placed to help.

  4. DoS Guidance - Scaling

    Ensure your service can scale to deal with surges in concurrent sessions.

  5. DoS Guidance - Response plan

    You should design your service, and plan your response to an attack, so that the service can continue to operate, albeit in a degraded fashion.

  6. DoS Guidance - Testing and monitoring

    Gain confidence in your defenses by testing them, and gain confidence you'll notice when attacks start by having the right tooling in place.

Reacting to a denial of service (DoS) attack

  1. A minimal Denial Of Service response plan

    This page outlines a minimal set of responses which you can adopt in the face of an imminent or on-going DoS attack

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