Check Network Bandwidth2021/08/26 |
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Install Iperf to Check Network Bandwidth.
It needs 2 Hosts, Sender Host and Receiver Host. |
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| [1] | Install [iperf3] on both Hosts. |
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[root@node01 ~]# dnf -y install iperf3
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| [2] | Run the command on Receiver Host like follows. It's possible to specify the listening port to add [-p (port number)] if you need. If port not specified. default port [5201] is used. If Firewalld is running, allow its port. |
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[root@node01 ~]# iperf3 -s ----------------------------------------------------------- Server listening on 5201 ----------------------------------------------------------- |
| [3] | Check Network Bandwidth to run the command on Sender Host like follows. The example below shows that 24.9 GBytes data are transfered and the bandwidth was 21.3 Gbits/sec. |
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[root@node02 ~]# iperf3 -c node01.srv.world Connecting to host node01.srv.world, port 5201 [ 5] local 10.0.0.52 port 40970 connected to 10.0.0.51 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 2.41 GBytes 20.7 Gbits/sec 0 2.63 MBytes [ 5] 1.00-2.00 sec 2.45 GBytes 21.1 Gbits/sec 0 2.90 MBytes [ 5] 2.00-3.00 sec 2.47 GBytes 21.2 Gbits/sec 0 2.90 MBytes [ 5] 3.00-4.00 sec 2.45 GBytes 21.0 Gbits/sec 0 3.05 MBytes [ 5] 4.00-5.00 sec 2.46 GBytes 21.1 Gbits/sec 0 3.05 MBytes [ 5] 5.00-6.00 sec 2.77 GBytes 23.8 Gbits/sec 0 3.05 MBytes [ 5] 6.00-7.00 sec 2.57 GBytes 22.1 Gbits/sec 0 3.05 MBytes [ 5] 7.00-8.00 sec 2.45 GBytes 21.1 Gbits/sec 0 3.05 MBytes [ 5] 8.00-9.00 sec 2.45 GBytes 21.0 Gbits/sec 0 3.05 MBytes [ 5] 9.00-10.00 sec 2.43 GBytes 20.9 Gbits/sec 0 3.05 MBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 24.9 GBytes 21.4 Gbits/sec 0 sender [ 5] 0.00-10.04 sec 24.9 GBytes 21.3 Gbits/sec receiver iperf Done. |
| [4] | There are many options to check Network Bandwidth under various cases. |
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[root@node02 ~]# iperf3 --help
Usage: iperf3 [-s|-c host] [options]
iperf3 [-h|--help] [-v|--version]
Server or Client:
-p, --port # server port to listen on/connect to
-f, --format [kmgtKMGT] format to report: Kbits, Mbits, Gbits, Tbits
-i, --interval # seconds between periodic throughput reports
-F, --file name xmit/recv the specified file
-A, --affinity n/n,m set CPU affinity
-B, --bind <host> bind to the interface associated with the address <host>
-V, --verbose more detailed output
-J, --json output in JSON format
--logfile f send output to a log file
--forceflush force flushing output at every interval
-d, --debug emit debugging output
-v, --version show version information and quit
-h, --help show this message and quit
Server specific:
-s, --server run in server mode
-D, --daemon run the server as a daemon
-I, --pidfile file write PID file
-1, --one-off handle one client connection then exit
--rsa-private-key-path path to the RSA private key used to decrypt
authentication credentials
--authorized-users-path path to the configuration file containing user
credentials
Client specific:
-c, --client <host> run in client mode, connecting to <host>
--sctp use SCTP rather than TCP
-X, --xbind <name> bind SCTP association to links
--nstreams # number of SCTP streams
-u, --udp use UDP rather than TCP
--connect-timeout # timeout for control connection setup (ms)
-b, --bitrate #[KMG][/#] target bitrate in bits/sec (0 for unlimited)
(default 1 Mbit/sec for UDP, unlimited for TCP)
(optional slash and packet count for burst mode)
--pacing-timer #[KMG] set the timing for pacing, in microseconds (default 1000)
--fq-rate #[KMG] enable fair-queuing based socket pacing in
bits/sec (Linux only)
-t, --time # time in seconds to transmit for (default 10 secs)
-n, --bytes #[KMG] number of bytes to transmit (instead of -t)
-k, --blockcount #[KMG] number of blocks (packets) to transmit (instead of -t or -n)
-l, --length #[KMG] length of buffer to read or write
(default 128 KB for TCP, dynamic or 1460 for UDP)
--cport <port> bind to a specific client port (TCP and UDP, default: ephemeral port)
-P, --parallel # number of parallel client streams to run
-R, --reverse run in reverse mode (server sends, client receives)
-w, --window #[KMG] set window size / socket buffer size
-C, --congestion <algo> set TCP congestion control algorithm (Linux and FreeBSD only)
-M, --set-mss # set TCP/SCTP maximum segment size (MTU - 40 bytes)
-N, --no-delay set TCP/SCTP no delay, disabling Nagle's Algorithm
-4, --version4 only use IPv4
-6, --version6 only use IPv6
-S, --tos N set the IP type of service, 0-255.
The usual prefixes for octal and hex can be used,
i.e. 52, 064 and 0x34 all specify the same value.
--dscp N or --dscp val set the IP dscp value, either 0-63 or symbolic.
Numeric values can be specified in decimal,
octal and hex (see --tos above).
-L, --flowlabel N set the IPv6 flow label (only supported on Linux)
-Z, --zerocopy use a 'zero copy' method of sending data
-O, --omit N omit the first n seconds
-T, --title str prefix every output line with this string
--get-server-output get results from server
--udp-counters-64bit use 64-bit counters in UDP test packets
--username username for authentication
--rsa-public-key-path path to the RSA public key used to encrypt
authentication credentials
[KMG] indicates options that support a K/M/G suffix for kilo-, mega-, or giga-
iperf3 homepage at: http://software.es.net/iperf/
Report bugs to: https://github.com/esnet/iperf
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