somepin a bit hicky with 2.4 I reckon 
from my oldass laptop to iPerf desktop server all on LAN same subnet

mrjcd@Will-Be-Was:~$ iperf3 -c dadeb.mrjcd.com
Connecting to host dadeb.mrjcd.com, port 5201
[  5] local 10.72.28.56 port 40200 connected to 10.72.28.3 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  14.9 MBytes   125 Mbits/sec    0    542 KBytes       
[  5]   1.00-2.00   sec  13.5 MBytes   113 Mbits/sec    0    872 KBytes       
[  5]   2.00-3.00   sec  13.8 MBytes   115 Mbits/sec    0    923 KBytes       
[  5]   3.00-4.00   sec  12.5 MBytes   105 Mbits/sec    0    946 KBytes       
[  5]   4.00-5.00   sec  13.8 MBytes   115 Mbits/sec    0   1.15 MBytes       
[  5]   5.00-6.00   sec  12.5 MBytes   105 Mbits/sec    0   1.37 MBytes       
[  5]   6.00-7.00   sec  12.5 MBytes   105 Mbits/sec    0   1.37 MBytes       
[  5]   7.00-8.00   sec  12.5 MBytes   105 Mbits/sec    0   1.45 MBytes       
[  5]   8.00-9.00   sec  12.5 MBytes   105 Mbits/sec    0   1.88 MBytes       
[  5]   9.00-10.00  sec  12.5 MBytes   105 Mbits/sec    0   2.13 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   131 MBytes   110 Mbits/sec    0             sender
[  5]   0.00-10.00  sec   129 MBytes   109 Mbits/sec                  receiver

iperf Done.
mrjcd@Will-Be-Was:~$ iperf3 -c dadeb.mrjcd.com -R
Connecting to host dadeb.mrjcd.com, port 5201
Reverse mode, remote host dadeb.mrjcd.com is sending
[  5] local 10.72.28.56 port 40204 connected to 10.72.28.3 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec  3.37 MBytes  28.2 Mbits/sec                  
[  5]   1.00-2.00   sec  3.45 MBytes  29.0 Mbits/sec                  
[  5]   2.00-3.00   sec  3.44 MBytes  28.9 Mbits/sec                  
[  5]   3.00-4.00   sec  3.44 MBytes  28.9 Mbits/sec                  
[  5]   4.00-5.00   sec  3.04 MBytes  25.5 Mbits/sec                  
[  5]   5.00-6.00   sec  3.47 MBytes  29.1 Mbits/sec                  
[  5]   6.00-7.00   sec  3.44 MBytes  28.8 Mbits/sec                  
[  5]   7.00-8.00   sec  3.41 MBytes  28.6 Mbits/sec                  
[  5]   8.00-9.00   sec  3.29 MBytes  27.6 Mbits/sec                  
[  5]   9.00-10.00  sec  3.30 MBytes  27.7 Mbits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.01  sec  34.1 MBytes  28.6 Mbits/sec   13             sender
[  5]   0.00-10.00  sec  33.7 MBytes  28.2 Mbits/sec                  receiver

iperf Done.
mrjcd@Will-Be-Was:~$ neofetch
       _,met$$$$$gg.          mrjcd@Will-Be-Was 
    ,g$$$$$$$$$$$$$$$P.       ----------------- 
  ,g$$P"     """Y$$.".        OS: Debian GNU/Linux bullseye/sid x86_64 
 ,$$P'              `$$$.     Host: Inspiron 3521 A14 
',$$P       ,ggs.     `$$b:   Kernel: 5.7.0-2-amd64 
`d$$'     ,$P"'   .    $$$    Uptime: 2 days, 11 hours, 37 mins 
 $$P      d$'     ,    $$P    Packages: 2141 (dpkg) 
 $$:      $$.   -    ,d$$'    Shell: bash 5.0.18 
 $$;      Y$b._   _,d$P'      Resolution: 1366x768 
 Y$$.    `.`"Y$$$$P"'         DE: GNOME 
 `$$b      "-.__              WM: Mutter 
  `Y$$                        WM Theme: Adwaita 
   `Y$$.                      Theme: Adwaita [GTK2/3] 
     `$$b.                    Icons: Adwaita [GTK2/3] 
       `Y$$b.                 Terminal: gnome-terminal 
          `"Y$b._             CPU: Intel i3-3227U (4) @ 1.900GHz 
              `"""            GPU: Intel 3rd Gen Core processor Graphics Controller 
                              Memory: 951MiB / 5836MiB 

                                                      


mrjcd@Will-Be-Was:~$