iperf -n option with udp


Hi,
I am a new user of iperf trying to test our network by passing a given amount of UDP traffic across. In order to do so, I run the following commands:
iperf -s -u
iperf -u -c 192.168.18.3 -n 20000


The -n option should limit the traffic passed to 20000 bytes however I seem to find that data transfer seems to occur indefinitely. I am using iperf 2.0.2 on ubuntu. Could someone shed some light on the behavior of the "-n" option ?
Thanks,
Gokul





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