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Van Jacobson made vast contributions to networking, in particular related to performance. He wrote the original traceroute tool based on a idea by Steve Deering, introduced Congestion Avoidance to TCP, proposed (with Sally Floyd) ECN, implemented the first zero-copy TCP in BSD Unix, and did some of the early work on what later became DiffServ and Premium IP. He is also one of the developers of BBR, a novel "model-based" congestion control algorithm.
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