It's possible to build something similar on top of TCP, see Minion [0] for an example. There are multiple reasons why this is less practical than building on top of UDP, the main two being, from my perspective: (1) this requires cooperation from the OS (either in form of giving you advanced API or having high enough privilege level to write TCP manually), and (2) this falls apart in presence of TCP middleboxes.[0] https://dedis.cs.yale.edu/2009/tng/papers/nsdi12-abs/
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