[RedlineTriad]

An example of what seems to be a reasonable usecase for UDP proxy is Quilkin[1] from Google. Made for hosting game servers on Kubernetes, and supports session auth, routing, monitoring, and various other features, some of them using prefix bits in UDP packages.

Also used for DOS protection without the traffic hitting the server.

Not sure how usable it is but Google actually has a lot of open-source stuff for game hosting on kubernetes with agones + openmatch + quilkin, I am somewhat tempted to play with them at some point.

[1] https://github.com/googleforgames/quilkin