

The Iperf server connects back to the client allowing the bi-directional bandwidth measurement. By default, only the bandwidth from the client to the server is measured.
If you want to measure the bi-directional bandwidth simultaneously, use the -d keyword. (See next test.)

#iperf -c 10.1.1.1 -r |
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 10.1.1.1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 5] local 10.6.2.5 port 35726 connected with 10.1.1.1 port 5001
[ 5] 0.0-10.0 sec 1.12 MBytes 936 Kbits/sec
[ 4] local 10.6.2.5 port 5001 connected with 10.1.1.1 port 1640
[ 4] 0.0-10.1 sec 74.2 MBytes 61.7 Mbits/sec

#iperf -s |
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 8.00 KByte (default)
------------------------------------------------------------
[852] local 10.1.1.1 port 5001 connected with 10.6.2.5 port 54355
[ ID] Interval Transfer Bandwidth
[852] 0.0-10.1 sec 1.15 MBytes 956 Kbits/sec
------------------------------------------------------------
Client connecting to 10.6.2.5, TCP port 5001
TCP window size: 8.00 KByte (default)
------------------------------------------------------------
[824] local 10.1.1.1 port 1646 connected with 10.6.2.5 port 5001
[ ID] Interval Transfer Bandwidth
[824] 0.0-10.0 sec 73.3 MBytes 61.4 Mbits/sec
Reference:
- Iperf is a tool to measure the bandwidth and the quality of a network link.
- IPERF: How to test network Speed,Performance,Bandwidth
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