nping - Network packet generation tool or ping utility.
There is an option called
--rate which send probes at a given rate. What is the maximum rate that can be sent? or What is the limitation of the rate?
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According to the source code, it appears that while the software requires only that the rate be a positive integer, the rate is functionally capped at 1001 since the rate is also used to calculate a delay:
1000 / rate
Your actual maximum rate will depend on your machine resources and the network.
A note in the code also suggests that
1000 is a "very high rate" and is used as an extreme test case.