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February 02, 2023 1:32PM
Recently, a vulnerability was reported to our bug bounty about a bug in the way some of our code interprets IPv4 addresses mapped into IPv6 addresses. Read about how Cloudflare addressed this vulnerability and what will prevent similar exploits in the future....
March 04, 2019 4:00PM
Rust JavaScript Cloudflare Workers Serverless IPv4In the previous post we described the Firewall Rules architecture and how the different components are integrated together. We created a configurable Rust library for writing and executing Wireshark®-like filters in different parts of our stack written in Go, Lua, C, C++ and JavaScript Workers....
September 10, 2018 10:21AM
IPv6 DNS Reliability Security AnycastBack in 2015 we deployed ECMP routing - Equal Cost Multi Path - within our datacenters. This technology allowed us to spread traffic heading to a single IP address across multiple physical servers....
August 16, 2018 4:01PM
1.1.1.1 Resolver IPv6 DNS TLSAndroid 9 Pie includes a slew of new features around digital well-being and privacy. Here's how to use the new Private DNS feature with 1.1.1.1....
July 19, 2018 1:03AM
IPv6 ChinaAt the end of 2017, Xinhua reported that there will be 200 Million IPv6 users inside Mainland China by the end of this year.. Halfway into the year, we’re seeing a rapid growth in IPv6 users and traffic originating from Mainland China....
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March 29, 2018 11:43AM
A friend gave me an interesting task: extract IP TTL values from TCP connections established by a userspace program. This seemingly simple task quickly exploded into an epic Linux system programming hack....
