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Raking the floods: my intern project using eBPF

Cloudflare’s globally distributed network is not just designed to protect HTTP services but any kind of TCP or UDP traffic that passes through our edge. To this end, we’ve built a number of sophisticated DDoS mitigation systems, such as Gatebot, which analyze world-wide traffic patterns. However, we’ve always employed defense-in-depth: in addition to global protection…

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Raking the floods: How to protect UDP services from DoS attacks with eBPF

Cloudflare’s globally distributed network is not just designed to protect HTTP services but any kind of TCP or UDP traffic that passes through our edge. To this end, we’ve built a number of sophisticated DDoS mitigation systems, such as Gatebot, which analyze world-wide traffic patterns. However, we’ve always employed defense-in-depth: in addition to global protection…

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Cloudflare’s Always Online and the Internet Archive Team Up to Fight Origin Errors

Every day, all across the Internet, something bad but entirely normal happens: thousands of origin servers go down, resulting in connection errors and frustrated users. Cloudflare’s users collectively spend over four and a half years each day waiting for unreachable origin servers to respond with error messages. But visitors don’t want to see error pages,…

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Moobot vs. Gatebot: Cloudflare Automatically Blocks Botnet DDoS Attack Topping At 654 Gbps

On July 3, Cloudflare’s global DDoS protection system, Gatebot, automatically detected and mitigated a UDP-based DDoS attack that peaked at 654 Gbps. The attack was part of a ten-day multi-vector DDoS campaign targeting a Magic Transit customer and was mitigated without any human intervention. The DDoS campaign is believed to have been generated by Moobot,…

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Secondary DNS – Deep Dive

How Does Secondary DNS Work?If you already understand how Secondary DNS works, please feel free to skip this section. It does not provide any Cloudflare-specific information.Secondary DNS has many use cases across the Internet; however, traditionally, it was used as a synchronized backup for when the primary DNS server was unable to respond to queries.…

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What Happens When The Whole World Goes Remote? Not To Worry, We Were Built For This

In March, governments all over the world issued stay-at-home orders, causing a mass migration to teleworking. Alongside many of our partners, Cloudflare launched free products and services supported by onboarding sessions to help our clients secure and accelerate their remote work environments. Over the past few months, a dedicated team of specialists met with hundreds…

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Add Watermarks to your Cloudflare Stream Video Uploads

Since the launch of Cloudflare Stream, our customers have been asking for a programmatic way to add watermarks to their videos. We built the Watermarks API to support a wide range of use cases: from customers who simply want to tell Stream “can you put this watermark image to the top right of my video?”…

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Migrating cdnjs to serverless with Workers KV

Cloudflare powers cdnjs, an open-source project that accelerates websites by delivering popular JavaScript libraries and resources via Cloudflare’s network. Since our major update in December, we focused on remodelling cdnjs for scalability and resilience. Today, we are excited to announce how Cloudflare delivers cdnjs—a migration to a serverless infrastructure using Cloudflare Workers and its distributed…

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