Created on 09-24-2025 09:48 AM
UDP testing is preferred when it comes to link bandwidth testing like a WAN link.
Packet loss is not considered when using UDP.
Data payload can be sent at very high rate over UDP.
The bandwidth value over UDP is raw and it's not limited by latency or packet loss.
Latency for acknowledgement or flow control could reduce the observed bandwidth when the test is done over TCP.
The following is an example of how to test a 1G bandwidth with iperf3 over UDP:
iperf3 -c <IP_server_address> -u -b 1G -t 20 -p 5201
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