When testing wireless (802.11) throughput, remember that you're not testing data rate. Data rate is the rate at which bits can be sent across the wireless medium, and is entirely dependent on signal quality and the modulation and coding scheme (MCS) used.
Higher data rates use more sophisticated modulation and coding schemes and require better RF/signal conditions than lower data rates. Data rate is a major factor in determining network throughput for a user, but it is not the only factor. The contention for the wireless medium must also be considered.
To repeat, throughput is not a simple factor of data rate. On a WLAN, useful throughput is always less than the data rate because of management traffic overhead.
- iPerf3 - this is a client/server throughput tester. typically the default behavior of iperf is to test the throughput from the client to the server. So, if you're testing a wireless client, to test the downlink, the wireless cli