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The benefits of serving stale DNS entries when using Consul

IntroductionWe use Consul for service discovery, and we’ve deployed a cluster that spans several of our data centers. This cluster exposes HTTP and DNS interfaces so that clients can query the Consul catalog and search for a particular service and the majority of the clients use DNS. We were aware from the start that the…

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Happy International Women’s Day!

Here at Cloudflare, we’re thrilled to celebrate International Women’s Day today! We have tons of events planned throughout the month of March, which is our way of honoring Women’s Empowerment Month. We’ll be making sure we acknowledge women’s achievements, raise awareness about women’s equality, and lobby for accelerated gender parity — Cloudflare style.We take the…

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Protecting against recently disclosed Microsoft Exchange Server vulnerabilities: CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065

Enabling the Cloudflare WAF and Cloudflare Specials ruleset protects against exploitation of unpatched CVEs: CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065.Cloudflare has deployed managed rules protecting customers against a series of remotely exploitable vulnerabilities that were recently found in Microsoft Exchange Server. Web Application Firewall customers with the Cloudflare Specials ruleset enabled are automatically protected against CVE-2021-26855,…

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The Teams Dashboard: Finding a Product Voice

My name is Alice Bracchi, and I’m the technical and UX writer for Cloudflare for Teams, Cloudflare’s Zero Trust and Secure Web Gateway solution.Today I want to talk about product voice — what it is, why it matters, and how I set out to find a product voice for Cloudflare for Teams.On the Cloudflare for…

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Conntrack turns a blind eye to dropped SYNs

IntroWe have been working with conntrack, the connection tracking layer in the Linux kernel, for years. And yet, despite the collected know-how, questions about its inner workings occasionally come up. When they do, it is hard to resist the temptation to go digging for answers.One such question popped up while writing the previous blog post…

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Cloudflare recognized as a ‘Leader’ in The Forrester Wave for DDoS Mitigation Solutions

We’re thrilled to announce that Cloudflare has been named a leader in The Forrester WaveTM: DDoS Mitigation Solutions, Q1 2021. You can download a complimentary copy of the report here. According to the report, written by, Forrester Senior Analyst for Security and Risk, David Holmes, “Cloudflare protects against DDoS from the edge, and fast… customer…

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How to execute an object file: Part 1

Calling a simple function without linking When we write software using a high-level compiled programming language, there are usually a number of steps involved in transforming our source code into the final executable binary: First, our source files are compiled by a compiler translating the high-level programming language into machine code. The output of the…

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The Teams Dashboard: Behind the Scenes

Back in 2010, Cloudflare was introduced at TechCrunch Disrupt as a security and performance solution that took the tools of the biggest service providers and made them available to anyone online. But simply replicating these tools wasn’t enough — we needed to make them ridiculously easy to use.When we launched Cloudflare for Teams almost ten…

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