File transfer over DNS
FToDNS transfers files through DNS queries and answers, splitting data across a transport with strict size and timing limits. It does not implement the FTP protocol.
FToDNS means “File Transfer over Domain Name Service”. It turns the small pieces available in DNS traffic into a path for moving files; it does not use the FTP protocol.
It sits beside HTTP, IP, and VPN examples as another answer to the same question: what happens when DNS is the only usable channel?
Primary source: https://github.com/neitzert/FToDNS