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Iperf

lastmod 2025-12-05created 2023-08-163 edits

Iperf is a network performance measurement and tuning tool. It is a cross-platform tool and can produce standardized performance measurements for any network.

Iperf has client and server functionality and can create data streams to measure the end-to-end throughput in one or both directions.

Example

How to check TCP data upload and download speeds.

Run the following on the server PC 

$ iperf -s

Then run the following on the client PC (of course, use the server's address as the IP address) 

iperf -c 192.168.0.95

When the connection succeeds and the test finishes, the server outputs: 

------------------------------------------------------------
Server listening on TCP port 5001
TCP window size:  128 KByte (default)
------------------------------------------------------------
[  1] local 192.168.0.95 port 5001 connected with 192.168.0.250 port 36640
[ ID] Interval       Transfer     Bandwidth
[  1] 0.0000-10.0898 sec   440 MBytes   366 Mbits/sec

The client outputs: 

------------------------------------------------------------
Client connecting to 192.168.0.95, TCP port 5001
TCP window size:  255 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.250 port 36640 connected with 192.168.0.95 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   440 MBytes   368 Mbits/sec

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author Zer0 sitemap