iperf actually *does* do that. It initiates a TCP control connection and then 
does load testing using UDP.

On 08.08.2017 09:20, Tobias Brunner wrote:
> Hi Jaehong,
>> And if I do udp iperf3 testing on port 4001, from client to server
>> Somehow the all the SA is up  and TCP control packets flows but not the
>> UDP data traffic.
> Why should there be TCP control packets if you do UDP testing?  At least
> iperf doesn't do that.  Are you sure you don't use the tool incorrectly?
> Regards,
> Tobias

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