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I use latest netsniff-ng under Linux (kernel 4.2.3, 64-bit).
Writing to file stops after about 3.7GB, and here is the statistics after exiting:
This looks lke some kind of bug that prevents writing to file after some size, and then all the packets are considered dropped.
For me, it happened all 3 or 4 times that I tried at almost the same sum of generated file sizes.