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so that the program can connect to the nc listening command and write stuff to it. This all works fine. The internal output buffers in the program are nearly 0 since nc reads much faster than the program can produce data. The program spits out the average size of its internal output buffer, and it is almost 0 (which would be great in real life). But I would like to see some simulated congestion so that the program spits out a larger amount of buffering.
nc -lk 127.0.0.1 4321 > /dev/null