Check Network Bandwidth

Check Network Bandwidth 2015/10/23

	Check Network Bandwidth with iperf. This needs 2 machine, Client(Sender) and Server(Receiver).
[1]	Install iperf3 (Install on both Client and Server) .

# install from EPEL [root@dlp ~]#  yum --enablerepo=epel -y install iperf3

[2]	Execute the command on the Server like follows. It's possible to specify the listening port to add "-p (port number)". If not specified. default port(5201) is used like follows.

[root@dlp ~]#  iperf3 -s  ----------------------------------------------------------- Server listening on 5201 -----------------------------------------------------------

[3]	Check Network Bandwidth to execute the command like follows. The example below shows that 4.24 GBytes datas are transfered and the bandwidth was 3.64 Gbits/sec.

[root@www ~]#  iperf3 -c 10.0.0.30  Connecting to host 10.0.0.30, port 5201 [ 4] local 10.0.0.206 port 53096 connected to 10.0.0.30 port 5201 [ ID] Interval Transfer Bandwidth Retr Cwnd [ 4] 0.00-1.00 sec 434 MBytes 3.64 Gbits/sec 58 407 KBytes [ 4] 1.00-2.00 sec 456 MBytes 3.83 Gbits/sec 0 452 KBytes [ 4] 2.00-3.00 sec 468 MBytes 3.93 Gbits/sec 0 481 KBytes [ 4] 3.00-4.00 sec 444 MBytes 3.73 Gbits/sec 52 370 KBytes [ 4] 4.00-5.00 sec 452 MBytes 3.79 Gbits/sec 0 395 KBytes [ 4] 5.00-6.00 sec 461 MBytes 3.87 Gbits/sec 0 406 KBytes [ 4] 6.00-7.00 sec 436 MBytes 3.66 Gbits/sec 50 313 KBytes [ 4] 7.00-8.00 sec 371 MBytes 3.11 Gbits/sec 52 245 KBytes [ 4] 8.00-9.00 sec 398 MBytes 3.34 Gbits/sec 0 260 KBytes [ 4] 9.00-10.00 sec 422 MBytes 3.54 Gbits/sec 0 269 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Retr [ 4] 0.00-10.00 sec 4.24 GBytes 3.64 Gbits/sec 212 sender [ 4] 0.00-10.00 sec 4.24 GBytes 3.64 Gbits/sec receiver iperf Done.

[4]	There are many options like below. Try to do.

[root@dlp ~]#  iperf3 --help  Usage: iperf [-s|-c host] [options] iperf [-h|--help] [-v|--version] Server or Client: -p, --port # server port to listen on/connect to -f, --format [kmgKMG] format to report: Kbits, Mbits, KBytes, MBytes -i, --interval # seconds between periodic bandwidth reports -F, --file name xmit/recv the specified file -A, --affinity n/n,m set CPU affinity -B, --bind <host> bind to a specific interface -V, --verbose more detailed output -J, --json output in JSON format -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 -1, --one-off handle one client connection then exit Client specific: -c, --client <host> run in client mode, connecting to <host> -u, --udp use UDP rather than TCP -b, --bandwidth #[KMG][/#] target bandwidth in bits/sec (0 for unlimited) (default 1 Mbit/sec for UDP, unlimited for TCP) (optional slash and packet count for burst mode) -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, --len #[KMG] length of buffer to read or write (default 128 KB for TCP, 8 KB for UDP) -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, --linux-congestion <algo> set TCP congestion control algorithm (Linux only) -M, --set-mss # set TCP maximum segment size (MTU - 40 bytes) -N, --nodelay set TCP 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' -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 [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