"You can even in theory transmit TCP packets (albeit slowly) over back and forth DNS modifications." More than theory: https://www.google.com/search?hl=en&q=tc

"You can even in theory transmit TCP packets (albeit slowly) over back and forth DNS modifications." More than theory: https://www.google.com/search?hl=en&q=tcp%2Dover%2Ddns https://www.google.com/search?hl=en&q=tcp%2Dover%2Ddns Given as a Google search rather than a concrete link because it's really a rich field. It did take me a few tries to get the right search term.