@bortzmeyer The TIC (Telecommunication Infrastructure Company) instructed ISPs and data centers to configure their DNS resolvers to TIC-provided IPs that remained whitelisted and connected to the Internet: 217.218.127.127
217.218.155.155
Typically, admins use public resolvers like Google or Cloudflare. But when international traffic is blocked, these become unreachable - breaking even local DNS resolution and disrupting domestic connectivity.