linux带宽统计工具vnstat

vnStat is a console-based network traffic monitor for Linux and BSD that keeps a log of network traffic for the selected interface(s). It uses the network interface statistics provided by the kernel as information source. This means that vnStat won't actually be sniffing any traffic and also ensures light use of system resources. However, in Linux at least a 2.2 series kernel is required.

This program is open source / GPL'ed and can be installed either as root or as a single user. Better instructions are included in the README. Feel free to send comments by email (remove the spamfilter) or try contacting me from irc (Vergo @ IRCNet). A discussion forum is also available. Announcements about new versions can be obtained by subscribing to the vnStat project at freshmeat.net.

下载地址：
官方站点：

Ubuntu 10.04 Server：
安装：emerge vnstat
第一次使用需要对每个网卡运行：#vnstat -u -i eth0 ……
1、查看5秒内网卡eth0的平均流量：默认5s

#vnstat -tr -i eth0

查看3秒内网卡eth0的平均流量：

#vnstat -tr  3 -i eth0

2、网卡eth0一周内的流量：

#vnstat -i eth0 -w

源码安装：

#get vnstat package
wget -O vnstat.tar.gz http://humdi.net/vnstat/vnstat-1.7.tar.gz
# unzip
tar -xzvf vnstat.tar.gz
cd vnstat-1.7
#INSTALL
make
make all
make install
#initial
vnstat -u -i eth0
#use
vnstat -tr -l eth0
### Result ###
133 packets sampled in 5 seconds
Traffic average for eth0

      rx          10.55 KiB/s            15 packets/s
      tx           1.06 KiB/s            11 packets/s

Monitoring eth0...    (press CTRL-C to stop)

   rx:       1.81 KiB/s    12 p/s          tx:       2.23 KiB/s    10 p/s