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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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    typically the rate of sending is limited to the network, not the local machine - there would be no theoretical limit as to how fast the local machine would generate packets to send to the wire - it's the wire that would impose the limit – schroeder Oct 14 '16 at 14:44
  • Max rate is 1000 pps. Anything above 1000 is considered to be infinity. – Karthick Dec 2 '20 at 6:25
  • can you point to a source where this is defined? – plonk Dec 2 '20 at 12:31
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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.

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