testing bandwidth

iperf
https://iperf.fr/

good for testing across WAN links etc


Server
iperf -s

Client (run test for 30 seconds)
iperf -c x.x.x.x -R -t 30


Iperf3 is the latest version (set the bandwidth to get the full speed)

iperf3.exe -u -c x.x.x.x -b 1000M -t 30

-i creates more streams

-u can give better performance also

Window size can give better results too.

iperf3.exe -u -c x.x.x.x -b 1000M -t 60 -w 64MB -i 3