带宽测试

场景

当时是想测试单台服务器，流量到某带宽值，cpu，内存，磁盘io的表现。
现在单说iperf和nc的简单使用。

iperf

简单使用

1. server端启用iperf -s
2. client端连接server端，默认端口是5001,iperf -c ${server_ip} ${port}

server端：

[root@SCA-LX5700025 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.8.199.17 port 5001 connected with 10.8.199.18 port 38008
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  1.13 GBytes   971 Mbits/sec

client端：

[root@SCA-LX5700026 ~]# iperf  -c 10.8.199.17 -p 5001
------------------------------------------------------------
Client connecting to 10.8.199.17, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 10.8.199.18 port 38008 connected with 10.8.199.17 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1.13 GBytes   973 Mbits/sec

出来的结果直接是带宽，比如上面的是趋近于1000M带宽。

参数

没有研究太多参数，更多参数可以-h查看。

• -b 指定带宽

  [root@SCA-LX5700026 ~]# iperf  -c 10.8.199.17 -p 5001 -b 500M
  ------------------------------------------------------------
  Client connecting to 10.8.199.17, TCP port 5001
  TCP window size: 85.0 KByte (default)
  ------------------------------------------------------------
  [  3] local 10.8.199.18 port 38010 connected with 10.8.199.17 port 5001
  [ ID] Interval       Transfer     Bandwidth
  [  3]  0.0-10.0 sec   625 MBytes   524 Mbits/sec

  nc

简单使用

1. server端启用nc -vvlnp ${server_port} >/dev/null，或者-4指定只使用ipv4的方式。
2. client端连接dd if=/dev/zero bs=1M count=1K | nc ${server_ip} ${server_port}，命令测试的是1G文件的下载速度。

server端：

[root@SCA-LX5700025 ~]# nc -vv4lnp 5001 >/dev/null
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Listening on 0.0.0.0:5001
Ncat: Connection from 10.8.199.18.
Ncat: Connection from 10.8.199.18:38410.
NCAT DEBUG: Closing fd 4.

client端：

[root@SCA-LX5700026 ~]# dd if=/dev/zero bs=1M count=1K | nc  10.8.199.17 5001
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 8.7875 s, 122 MB/s

refer:

https://askubuntu.com/questions/7976/how-do-you-test-the-network-speed-between-two-boxes