Iperf 3.21 cannot establish a connection with very short packets. It works properly when the length parameter is greater than 508.
abajkowski@abajkowski:~$ iperf3 -c 192.168.1.1 -R -t 3600 -u -b 3G -l 500 --gsro
Connecting to host 192.168.1.1, port 5201
Reverse mode, remote host 192.168.1.1 is sending
[ 5] local 192.168.1.10 port 55486 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-1.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
^C[ 5] 1.00-1.77 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-1.77 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%) sender
[ 5] 0.00-1.77 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%) receiver
iperf3: interrupt - the client has terminated by signal Interrupt(2)
Iperf 3.21 cannot establish a connection with very short packets. It works properly when the length parameter is greater than 508.