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We would say MixApp was using TCP-over-UDP instead of the typical TCP-over-IP. Sometimes the application wants to run a "reliable bidirectional byte-stream protocol," but one that's not TCP.
Some custom protocols support TCP, too. ExpressVPN's Lightway is a great example, and you'll find both 'Lightway - UDP' and 'Lightway - TCP' options in its Protocol settings box.
TCP is considered the "reliable" protocol because it is connection oriented. But if it's so reliable, why do avionics systems like AFDX use UDP?
The advantage to using TCP for transporting the control protocol is that you’re guaranteed the control information is delivered. On the other hand, you also could use UDP if the protocol is ...
DNS uses port 53 and uses UDP for the transport layer. To filter DNS traffic, the filter udp.port==53 is used. As can be seen in Figure E, four queries were made to DNS over the course of this ...
As TCP is a connection-oriented protocol -- it requires a handshake and session between sender and receiver. UDP can route packets based on a variety of factors.
According to this group, starting with February 1, 2020, DNS servers that can't handle DNS queries over both UDP and TCP may be pushed out of the DNS ecosystem and stop working.
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