iperf/iperf3网络测试工具的安装与使用

1.官网及下载路径：

iperf3 homepage at: http://software.es.net/iperf/
Report bugs to: https://github.com/esnet/iperf

2.iperf3命令选项

[ubuntu @meta]$ iperf3
iperf3: parameter error - must either be a client (-c) or server (-s)

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
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 ( for unlimited)
                            (default  Mbit/sec for UDP, unlimited for TCP)
                            (optional slash and packet count for burst mode)
  -t, --time      #         time in seconds to transmit for (default  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  KB for TCP,  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]    TCP 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 -  bytes)
  -N, --nodelay             set TCP no delay, disabling Nagle's Algorithm
  -, --version4            only use IPv4
  -, --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

3.iperf3的测试例子

测试1：
一台电脑本地回环测试
打开两个终端t1和t2，在t1中输入命令:iperf3 -s 在t2中输入命令: iperf3 -c 127.0.0.1 -t
本例中t2向t1发送5秒中的数据包

测试2：
一台电脑的实际网卡：
打开两个终端t1和t2，在t1中输入命令:iperf3 -s 在t2中输入命令: iperf3 -c 10.219.119.21

测试3：
两台电脑之间发包测试,在电脑A中打开终端t1，在电脑B中打开终端t2，确保两台电脑在同一个局域网中并假设t1的IP地址为192.168.1.，t2的IP地址为192.168.1.
在t1中输入命令: iperf3 -s 在t2中输入命令: iperf3 -c 192.168.1.123 -t
如果出现错误iperf3: error - unable to connect to server: No route to host，请修改电脑A的防火墙规则。

防火墙规则修改方法：
防火墙会阻止两台电脑之间的通信。centos7.0自带的防火墙为firewalld，可以先把firewalld删除，再安装iptalbes。
在t1中输入以下两条的命令来停用firewalld:
.删除firewalld的命令如下
sudo systemctl stop firewalld //关闭
sudo systemctl disable firewalld //禁止开机启动
.安装iptables的命令如下
sudo yum install -y iptables-services.x86_64 iptables-devel.x86_64
重新测试iperf3，在t1中输入命令:
sudo iptables -I INPUT  -s 192.168.1.124 -j ACCEPT
sudo service iptables save
iperf3 -s
在t2中输入命令:
iperf3 -c 192.168.1.123 -t 

. Apple手机测试
开发板host，ip:172.27.0.25,App手机做client:
测试UDP：
开发板：# iperf -V -s -u
手机：iperf -p  -l  -w  -i 1.0 -u -c 172.27.0.25 -t 10.0 -b 100m
测试TCP：
开发板：# iperf -V -s
手机：iperf -p  -l  -w  -i 1.0 -c 172.27.0.25 -t 10.0

开发板client,App手机做service,ip:172.27.0.165
测试TCP：
开发板：# iperf -c 172.27.0.165 -w 128k -t 10.0 -i 1.0 -p
手机：# iperf -p  -l  -w  -i 1.0 -s
测试UDP：
开发板：# iperf -c 172.27.0.165 -w 128k -t 10.0 -i 1.0 -p  -l  -u -b 50m
手机：# iperf -p  -l  -w  -i 1.0 -u -s

4.iperf3卸载
查看所有已经安装的软件：
sudo yum list installed
删除iperf3：
sudo yum -y remove iperf3.x86_64

5.软件包中的test_command.sh

#!/bin/sh
#
# This is a set of commands to run and verify they work before doing a new release.
# Eventually they should also use the -J flag to generate JSON output, and a program should
# be written to check the output.
# Be sure to test both client and server on Linux, BSD, and OSX
#

if [ $# -ne  ]
then
  echo "Usage: `basename $0` hostname"
  exit $E_BADARGS
fi

set -x

host=$

# basic testing
./src/iperf3 -c $host -V -t  -T "test1"
./src/iperf3 -c $host -u -V -t
# omit mode
./src/iperf3 -c $host -i . -O  -t
# JSON mode
./src/iperf3 -c $host -i  -J -t
# force V4
./src/iperf3 -c $host - -t
./src/iperf3 -c $host - -u -t
# force V6
./src/iperf3 -c $host - -t
./src/iperf3 -c $host - -u -t
# parallel streams
./src/iperf3 -c $host -P  -t
./src/iperf3 -c $host -u -P  -t
# reverse mode
./src/iperf3 -c $host -P  -t  -R
./src/iperf3 -c $host -u -P  -t  -R
# zero copy
./src/iperf3 -c $host -Z -t
./src/iperf3 -c $host -Z -t  -R
# window size
./src/iperf3 -c $host -t  -w 8M
# -n flag
./src/iperf3 -c $host -n 5M
./src/iperf3 -c $host -n 5M -u -b1G
# conflicting -n -t flags
./src/iperf3 -c $host -n 5M -t
# -k mode
./src/iperf3 -c $host -k 1K
./src/iperf3 -c $host -k 1K -u -b1G
# CPU affinity
./src/iperf3 -c $host -A /
./src/iperf3 -c $host -A / -u -b1G
# Burst mode
./src/iperf3 -c $host -u -b1G/
# change MSS
./src/iperf3 -c $host -M  -V
# test congestion control option (linux only)
./src/iperf3 -c $host -C reno -V

6. 若网络媒体出现卡顿可以是用iperf测试卡顿时网络的带宽，以定位是否是底层问题。