# iperf > Measure network bandwidth between computers. > More information: . - Run on server: `iperf -s` - Run on server using UDP mode and set server port to listen on 5001: `iperf -u -s -p {{5001}}` - Run on client: `iperf -c {{server_address}}` - Run on client every 2 seconds: `iperf -c {{server_address}} -i {{2}}` - Run on client with 5 parallel threads: `iperf -c {{server_address}} -P {{5}}` - Run on client using UDP mode: `iperf -u -c {{server_address}} -p {{5001}}`