If memory serves me right, Bob McMahon via Iperf-users wrote: > 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.
iperf3 also uses sequence numbers in each packet. I presume the OP is referring to iperf3, because information on the number of packets transmitted and received is also conveyed over the (TCP-based) control channel. Bruce. > On Mon, Aug 6, 2018 at 12:53 AM, Ayrton Senna > <ayrtonsenna.ph...@gmail.com <mailto: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 > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Iperf-users mailing list > Iperf-users@lists.sourceforge.net > <mailto:Iperf-users@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/iperf-users > <https://lists.sourceforge.net/lists/listinfo/iperf-users> > > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > > _______________________________________________ > Iperf-users mailing list > Iperf-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/iperf-users >
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