Nice Tool for Monitor Network

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本文介绍如何使用iftop和nload工具在CentOS和Ubuntu系统上实时监控网络流量。通过简单的命令安装并运行这些工具，可以方便地查看发送与接收的数据速率、峰值及累计流量等信息。

Nice Tool for Monitor Network

I just did that on CentOS machine.

>sudo yum install -y nload

Using nload
>nload venet0 -u b|k|m|g
b = bytes
k = kilobytes
m= megabytes
g = gigabytes

Or Iftop on CentOS works as well.
>sudo yum install iftop
>sudo iftop

On my Ubuntu System
>sudo apt-get install iftop
>sudo iftop

Here is some information about iftop
TX sending
RX receiving
total: sending + receiving
Peak:
rate: average speed of 2s, 10s, 40s
cum: since it starts

References:
https://www.vultr.com/docs/how-to-monitor-network-traffic-in-real-time-on-centos-6
http://www.ex-parrot.com/pdw/iftop/
https://www.vpser.net/manage/iftop.html
http://kodango.com/using-iftop-to-monitor-network