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IRTT (Isochronous Round-Trip Tester) is software that runs on a client and server, using its own UDP-based protocol to allow measurements including round-trip time, one-way delay (assuming the clocks are synchronized), and lost/out-of-order/duplicate packets. It has features for reasonably secure use on both public and private servers, including optional HMAC (access control) and three-way handshake (anti-spoofing).