This reminds me of the old tools that tunnel more or less whatever over DNS. I.e. behind the scenes, the tool would look up "base64encodedpacket.domainyoucontr

This reminds me of the old tools that tunnel more or less whatever over DNS. I.e. behind the scenes, the tool would look up "base64encodedpacket.domainyoucontrol.example.com", and it would respond with encoded data going the other way. This is because captive portal WiFi often permitted DNS to pass through unimpeded, for various reasons. I always appreciated the hack, even though I could never bring myself to use it due to the obvious cache pollution problem on the various DNS servers.