How to run iperf test via CLI, tested on 7.6.6
# Set the interface that will reach the internet (e.g., wan1)
diagnose traffictest client-intf wan1
diagnose traffictest server-intf wan1
# Set the port (iperf3 default is 5201)
diagnose traffictest port 5201
# Set protocol: 0 for TCP (default), 1 for UDP
diagnose traffictest proto 0
# Test the upload (FG -> SRV)
diagnose traffictest run -c ping.online.net
# Test Download (SRV -> FG)
diagnose traffictest run -c ping.online.net -R
