@R1D2 Thanks for the reminder. I will do so. But regardless, bottomline I guess is it is a firm "No" on the internal "legacy" iperf compatibility issue.

@R1D2 My SNR is 42 dBm -- so I guess the alignment should be more or less OK ? I can't get it any higher than that.

Thanks for the interest. My setup is like this : Modem+router-------------CPE610 (AP) ))))))))))))) (((((((((CPE510 (Client)-----------Router (AP))))))))) mobile phones | | | laptop Legacy speed test...

I read somewhere that Tools/Speed Test was actually based on iperf. Well, I tried my best to establish an iperf connection between CPE510 and my laptop (which can iperf with other laptops fine), but...