Solving weird DNS resolv.conf issues on Ubuntu using the resolvconf service
Ubuntu has this fancy system where by /etc/resolv.conf isn’t actually a proper resolver but refers to a local server called 127.0.0.53. To be honest this
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How to purge Google and Cloudflare’s DNS Caches
With the best of luck your client might be using Google or Cloudflare’s DNS servers, and after a recent (a few hours or minutes) DNS