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The IP address of a computer should never be known. It should be impossible to ping a computer directly. DNS servers should be the proxy who get requests and fetch data on behalf of a client. They cache and mask DoS attacks. Clients and user-facing machines only communicate with proxies

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This "solution" is about on the same level as saying that you just have to pour more stronger lasers into a bigger thicker metal cage that contains hydrogen in order to obtain fusion reactors. That won't get you the pressure and temperatures you want yet? MOAR LAZOR!

What about M2M communication? Or server initiated communication (something like LWM2M)? How would you get around having an IP address there?

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