Why has the number of successful DDoS mitigations by Cloudflare decreased despite an increase in attack volume?

Introduction

The decrease in successful DDoS mitigations by Cloudflare despite an increase in attack volume presents a complex challenge that requires careful analysis. This issue directly impacts Cloudflare's core value proposition of providing robust protection against distributed denial-of-service attacks. To address this problem, I'll employ a systematic approach to identify, validate, and resolve the root cause while considering both immediate and long-term implications for Cloudflare's DDoS mitigation service.

Step 1

Clarifying Questions (3 minutes)

• Looking at the timing, I'm thinking there might be a recent change in attack patterns. Has there been a significant shift in the types of DDoS attacks Cloudflare is encountering?

Why it matters: Understanding changes in attack patterns could reveal why current mitigation strategies are less effective. Expected answer: Yes, there's been an increase in more sophisticated, multi-vector attacks. Impact on approach: If confirmed, we'd need to focus on enhancing detection and mitigation capabilities for complex attack vectors.

• Considering the metric definition, I'm wondering if there have been any changes in how we measure successful mitigations. Has the criteria for classifying a mitigation as "successful" been altered recently?

Why it matters: Changes in measurement criteria could explain the apparent decrease in successful mitigations. Expected answer: No changes in the success criteria have been made. Impact on approach: If unchanged, we'd need to look deeper into the technical aspects of our mitigation systems.

• Thinking about system capacity, I'm curious about our infrastructure scaling. Has Cloudflare's network capacity kept pace with the increase in attack volume?

Why it matters: Insufficient scaling could lead to decreased mitigation effectiveness during high-volume attacks. Expected answer: Network capacity has been increased, but perhaps not proportionally to attack volume growth. Impact on approach: If capacity is an issue, we'd need to prioritize infrastructure scaling in our solution.

• Considering user segments, I'm wondering if this decrease is uniform across all customers. Are we seeing differences in mitigation success rates between enterprise and smaller customers?

Why it matters: Segmented analysis could reveal if the issue is global or specific to certain customer types. Expected answer: The decrease is more pronounced for enterprise customers facing larger, more complex attacks. Impact on approach: If confirmed, we'd need to tailor our solutions to address enterprise-specific attack patterns.

• Thinking about recent product changes, have there been any significant updates to Cloudflare's DDoS mitigation algorithms or systems in the past quarter?

Why it matters: Recent changes could have unintended consequences on mitigation effectiveness. Expected answer: Yes, we implemented a new machine learning model for attack detection last month. Impact on approach: If recent changes are confirmed, we'd need to investigate their impact and potentially roll back or optimize these updates.