speaking for iperf2 <https://sourceforge.net/projects/iperf2/>, the iperf
client writes a sequence number in every packet. The server then
calculates the lost packets per the sequence number gaps.
For iperf2, there is no test hanshake between client and server for basic
UDP tests.
Bob
On Mon, Aug 6, 2018 at 12:53 AM, Ayrton Senna <ayrtonsenna.ph...@gmail.com>
wrote:
> Hello,
>
> This question has been bugging me since I started using iperf and I
> couldn't find an answer by simply sifting through old iperf discussions
> online.
>
> So, Since UDP uses connectionless communication, how, in theory, is iperf
> using it to know the number of lost packets during transmission between
> service and client?
> I can only imagine that this is achieved by establishing a TCP(or
> other)-based connection on top first, and then somehow wrapping the UDP
> connection, because when iperf UDP test is run, both client and server seem
> to exchange information or do some sort of handshaking.
>
> Thanks,
> Ayrton
>
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