Update cheatsheets

iperf3

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# iperf3
+
+> Traffic generator for testing network bandwidth.
+> More information: <https://iperf.fr>.
+
+- Run iperf3 as a server:
+
+`iperf3 -s`
+
+- Run an iperf3 server on a specific port:
+
+`iperf3 -s -p {{port}}`
+
+- Start bandwidth test:
+
+`iperf3 -c {{server}}`
+
+- Run iperf3 in multiple parallel streams:
+
+`iperf3 -c {{server}} -P {{streams}}`
+
+- Reverse direction of the test. Server sends data to the client:
+
+`iperf3 -c {{server}} -R`