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March 20, 2023 1:00PM
If I navigate to https://blog.cloudflare.com/, my browser will connect to a remote TCP address from the local IP address assigned to my machine, and a randomly chosen local TCP port. What happens if I then decide to head to another site?...
January 16, 2023 1:46PM
Deep Dive Linux Networking DebuggingA race condition in the virtual ethernet driver of the Linux kernel led to occasional packet content corruptions, which resulted in unwanted packet drops by one of our DDoS mitigation systems. This blogpost describes the thought process and technique we used to debug this complex issue....
July 18, 2022 1:56PM
Deep Dive Linux NetworkingA crash in a development version of flowtrackd (the daemon that powers our Advanced TCP Protection) highlighted the fact that libxdp (and specifically the AF_XDP part) was not Linux network namespace aware. This blogpost describes the debugging journey to find the bug, as well as a fix....
March 24, 2022 1:32PM
Security Week Cloudflare Radar Networking SecurityAutonomous Systems (ASes) are a group of routable IP prefixes belonging to a single entity or organization, and is one of the fundamental building blocks of the Internet...
February 02, 2022 9:53AM
Deep Dive UDP TCP Linux NetworkingOften programmers have assumptions that turn out, to their surprise, to be invalid. From my experience this happens a lot. Every API, technology or system can be abused beyond its limits and break in a miserable way...
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