How to Protect From a DDoS Attack

How to Protect From a DDoS Attack

Protecting from a DDoS attack means combining network monitoring, traffic filtering, and response plans so your services stay available when attackers try to overwhelm them with traffic. Start by knowing what normal traffic looks like and having a way to spot sudden spikes before they cause outages.

Understand the Threat

A distributed denial-of-service attack uses many compromised devices to flood your servers, applications, or network with requests, aiming to exhaust bandwidth or resources. Common types include volumetric attacks that saturate your pipe, protocol attacks that exploit network resources, and application-layer attacks that target specific services. Each type requires different defenses.

Core Protection Measures

• Over-provision bandwidth: Keep capacity above your typical peak so you can absorb short spikes.
• Use a CDN or edge scrubbing service: Services like Cloudflare, Akamai, or AWS Shield filter malicious traffic before it reaches your origin.
• Rate limiting and throttling: Restrict requests per IP or per second to slow down floods.
• Web Application Firewall (WAF): Block application-layer attacks targeting HTTP, DNS, or APIs.
• Anycast network diffusion: Spread traffic across multiple data centers so no single point gets overwhelmed.
• Blackhole routing and null routing: As a last resort, discard traffic to a targeted IP, but this also drops legitimate users.

Detection and Response Planning

Set up alerts for unusual traffic patterns and define a DDoS response playbook that covers who is responsible, when to engage your ISP or mitigation provider, and how to communicate with users. Test the plan with tabletop exercises so your team can act under pressure.

When to Call for Help

If the attack exceeds your on-premises capacity or targets critical applications, contact your ISP, cloud provider, or a specialized DDoS mitigation service immediately. They can divert or scrub traffic at scale. Document attacks afterward to refine defenses and improve future response times.