The story of one latency spike
November 19, 2015 3:05 PM
A customer reported an unusual problem with our CloudFlare CDN: our servers were responding to some HTTP requests slowly. Extremely slowly. 30 seconds slowly....
Announcing Universal DNSSEC: Secure DNS for Every Domain
November 10, 2015 1:56 PM
CloudFlare launched just five years ago with the goal of building a better Internet. That’s why we are excited to announce that beginning today, anyone on CloudFlare can secure their traffic with DNSSEC in just one simple step....
Creative foot-shooting with Go RWMutex
October 29, 2015 9:26 PM
Hi, I'm Filippo and today I managed to surprise myself! (And not in a good way.) I'm developing a new module ("filter" as we call them) for RRDNS, CloudFlare's Go DNS server. ...
DNSSEC is Open for Beta
October 20, 2015 8:54 PM
Since January, CloudFlare has been running a small, private beta for DNSSEC. Starting today, the DNSSEC beta is open for everyone. ...
A Look at the New WordPress Brute Force Amplification Attack
October 16, 2015 5:14 PM
Recently, a new brute force attack method for WordPress instances was identified by Sucuri. This latest technique allows attackers to try a large number of WordPress username and password login combinations in a single HTTP request....
MORE POSTS
September 07, 2015 9:52 AM
Kernel bypass
In two previous posts we've discussed how to receive 1M UDP packets per second and how to reduce the round trip time. We did the experiments on Linux and the performance was very good considering it's a general purpose operating system....
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August 06, 2015 1:40 PM
DNS parser, meet Go fuzzer
Here at CloudFlare we are heavy users of the github.com/miekg/dns Go DNS library and we make sure to contribute to its development as much as possible. Therefore when Dmitry Vyukov published go-fuzz and started to uncover tens of bugs in the Go standard library, our task was clea...
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August 05, 2015 2:13 AM
Up and to the Right: Forrester Research Ranks CloudFlare as a “Leader” for DDoS Services Providers
Forrester Research, Inc. has released The Forrester Wave™: DDoS Services Providers, Q3 2015 report which ranks CloudFlare as a leader. How do you get placed “up and to the right”? ...
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August 04, 2015 10:36 AM
A deep look at CVE-2015-5477 and how CloudFlare Virtual DNS customers are protected
Last week ISC published a patch for a critical remotely exploitable vulnerability in the BIND9 DNS server capable of causing a crash with a single packet. ...
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August 03, 2015 11:26 AM
Quick and dirty annotations for Go stack traces
CloudFlare’s DNS server, RRDNS, is entirely written in Go and typically runs tens of thousands goroutines. Since goroutines are cheap and Go I/O is blocking we run one goroutine per file descriptor we listen on and queue new packets for processing....
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July 03, 2015 1:41 PM
Blue Light Special: Ensuring fast global configuration changes
CloudFlare operates a huge global network of servers that proxy our customers' web sites, operate as caches, inspect requests to ensure they are not malicious, deflect DDoS attacks and handle one of the largest authoritative DNS systems in the world. ...
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July 01, 2015 1:26 PM
Setting Go variables from the outside
CloudFlare's DNS server, RRDNS, is written in Go and the DNS team used to generate a file called version.go in our Makefile. version.go looked something like this....
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June 18, 2015 11:14 AM
Go has a debugger—and it's awesome!
Something that often, uh... bugs Go developers is the lack of a proper debugger. Builds are ridiculously fast and easy, but sometimes it would be nice to just set a breakpoint and step through that endless if chain or print a bunch of values without recompiling ten times....
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May 21, 2015 10:10 PM
Welcome Acquia!
We’ve had the good fortune to share many great experiences with the Acquia team over the last few years. From breaking bread with founder and CTO Dries Buytaert at SXSW, to staying up late with their incredible team onboarding a joint customer under a DDoS attack. ...
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April 30, 2015 12:02 PM
An introduction to JavaScript-based DDoS
CloudFlare protects millions of websites from online threats. One of the oldest and most pervasive attacks launched against websites is the Distributed Denial of Service (DDoS) attack....
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April 25, 2015 3:57 AM
New Magento WAF Rule – RCE Vulnerability Protection
Today the Magento Security Team created a new ModSecurity rule and added it to our WAF rules to mitigate an important RCE (remote code execution) vulnerability in the Magento web e-commerce platform....
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March 10, 2015 12:59 PM
Announcing Virtual DNS: DDoS Mitigation and Global Distribution for DNS Traffic
It’s 9am and CloudFlare has already mitigated three billion malicious requests for our customers today. Six out of every one hundred requests we see are malicious, and increasingly, more of those bad requests are targeting DNS nameservers. ...
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March 06, 2015 2:33 PM
Deprecating the DNS ANY meta-query type
DNS, one of the oldest technologies running the Internet, keeps evolving. There is a constant stream of new developments, from DNSSEC, through DNS-over-TLS, to a plentiful supply of fresh EDNS extensions....
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February 05, 2015 6:48 PM
Updating the DNS Registration Model to Keep Pace with Today’s Internet.
CloudFlare is, arguably, the largest third-party DNS Authoritative operator in the world. We manage well over 1 million domains and have registrations in almost every TLD open for registrations....
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