====== Vnstat ======

= vnstat - Network Traffic Logger and Monitor =
vnstat keeps a daily log of network traffic for a specific device (eth0). Information is simply taken from /proc every 5 minutes via <del>cron</del> vnstatd daemon and saved to /var/lib/vnstat

What is good about vnstat, unlike munin or mrtg, is that **vnstat keeps an accurate and numerical account of all network traffic**. This is extremely useful if you have to watch bandwidth usage!!

===== Install and Config vnstat =====
 apt-get install vnstat
 
 <del>#check in /etc/cron.d/ for vnstat</del>
 #You may get the error:
 Starting vnStat daemon: vnstatdZero database found, exiting
 
 ifconfig
 #check for the current network interface been used.
 
 vnstat
 #if its the first time running vnstat, it will tell you to config vnstat to use an interface.
 #The following is the syntax used to monitor an interface:
 vnstat -u -i eth0
 /etc/init.d/vnstat start

===== Check Network Traffic and Bandwidth Used =====
 vnstat  #With no options, shows the totals.
 
 vnstat -h  #Show traffic for the last 24 hours.
 vnstat -d  #Show traffic for days.
 vnstat -t  #Show all time top10 traffic days.
 vnsatt -w  #Show traffic for 7 days.
 vnstat -m  #Show traffic for months.
 
 vnstat -tr #Show an immediate, real time sample, over a period of 5 (default if no number is given) seconds.

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Links: 

http://www.olofsson.tv/index.php/archives/90

http://humdi.net/vnstat/