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Have you ever tried to access one of the 13 root servers other than through DNS?
Personally, For over 15 years, I haven't allowed any of my servers/computers direct access from the Internet without a hardware firewall(*) in the middle other than one server which runs my collection of honeypots VMs and has no internal access. We all need a hobby.
* Any internal device that needs to be accessed from outside the LAN gets firewall rules and network address translated through a hardware firewall ( I do like Palo Alto's devices).
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