Iperf two-way flow throughput test, UDP mode,


With a thread in the client for a two-way test 2, the positive connection of 2 is correct, the server side according to bandwidth and packet loss rate is also correct, such as

But the Server end shows reverse connection (Server to client) four a day, but did not show the client end reverse connection, and did not show the data sent in the backward direction bandwidth and packet loss rate, etc.,

Use tcpdump respectively on the server side and client side caught, the result is forward two reverse the process of four packages,

So why card received a package, iperf did not receive?

Doubt iperf have bugs, please familiar iperf great god taught,