iperf3的安装
通过互联网apt-get install自动安装
sudo apt-get install iperf3（version3）
sudo apt-get install iperf（默认是version2）
sudo apt-get install traceroute
环境的搭建和使用
介绍iperf3
白话文的讲，iperf3就是一个网络链路质量检测的一个工具。说到网络链路这就涉及到两端，顾名思义就是要部署两台。
数据中心A和数据中心B都部署相同版本的iperf3工具，当然也可以使用不同版本的。本人强迫症~
介绍拓扑
微信截图_20200421140941.png
通过拓扑可以看到，有两台iperf3服务器，一台在数据中心A架构中，一台在数据中心B架构中。
iperf3 IP:1.1.1.1
route add -net 2.2.2.2/32 gw 1.1.1.254
iperf3 IP:2.2.2.2
route -add -net 1.1.1.1/32 gw 2.2.2.254
首先通过静态路由保证两端可以正常通讯，这一步如果没问题就可以进行下一步。
iperf3命令介绍
network@iperf:~$ iperf3 -help #-help查看所有命令集
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
--logfile f send output to a log file
-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
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)
--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'
-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
--no-fq-socket-pacing disable fair-queuing based socket pacing
(Linux only)
服务器端开启server模式(1.1.1.1)
network@iperf:~$ iperf3 -s
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
#-s, --server run in server mode
服务器端开启client模式(2.2.2.2)
iperf3 -c 1.1.1.1 -i 1 -t 60 -b 40M -n --20G
#本段ip为2.2.2.2，-c指定服务器端ip，-i指定回显结果间隔时间，-t指定一共传输消耗时间，-b指定传输速率，-n共计传输多少大小数据。
network@iperf:~$ iperf3 -c 1.1.1.1 -i 1 -t 60 -b 40M -n --20G
Connecting to host 1.1.1.1, port 5201
[ 4] local 10.1.96.112 port 34598 connected to 1.1.1.1 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 4.45 MBytes 37.3 Mbits/sec 0 35.4 KBytes
[ 4] 1.00-2.00 sec 4.72 MBytes 39.6 Mbits/sec 0 35.4 KBytes
[ 4] 2.00-3.00 sec 4.66 MBytes 39.1 Mbits/sec 0 35.4 KBytes
^C[ 4] 3.00-3.50 sec 2.36 MBytes 39.4 Mbits/sec 0 35.4 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-3.50 sec 16.2 MBytes 38.8 Mbits/sec 0 sender
[ 4] 0.00-3.50 sec 0.00 Bytes 0.00 bits/sec receiver
iperf3: interrupt - the client has terminated
如果不指定-b参数，那么链路将以最大带宽值值去传输，如果专线是50兆，那么就是50兆的带宽去传输。如果结果显示是低于50兆的，那么可以确定专线的质量没有达到指定数值。
iperf测量丢包率
network@iperf:~$ iperf3 -c 1.1.1.1 -i 1 -t 60 -b 40M -n --20G -u
在刚才的命令上添加-u参数，以UDP的报文去传输。
以下是server端看到的数值
[ 5] local 1.1.1.1 port 5201 connected to 2.2.2.2 port 37849
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 5] 0.00-1.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
[ 5] 1.00-2.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
[ 5] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
[ 5] 3.00-4.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
[ 5] 4.00-5.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
[ 5] 5.00-6.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
[ 5] 6.00-7.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
[ 5] 7.00-8.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
[ 5] 8.00-9.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
[ 5] 9.00-10.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
[ 5] 9.00-10.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%)
iperf3: the client has terminated
得出的结果就是在传输过程中没有丢包，丢包率为0%
