iperf: update page (#3960)

pages/common/iperf.md

@@ -7,10 +7,22 @@
 
 `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}}`