Fixing reachability to 1.1.1.1, GLOBALLY!

What this post added

This post details the challenges and efforts involved in ensuring global reachability to Cloudflare's new DNS resolver, 1.1.1.1. It highlights how widespread misconfigurations and intentional misuse of the 1.1.1.1 IP address by ISPs and CPE manufacturers were identified using RIPE Atlas probes. The post outlines the process of contacting these operators to resolve issues, leading to significant improvements in 1.1.1.1 availability worldwide. It also touches upon the unsolicited background traffic observed on these IPs, indicating potential botnet activity or misconfigurations.