vnStat is a network traffic monitor for Linux that keeps a log of daily network traffic for the selected interface. vnStat isnt a packet sniffer. The traffic information is analyzed from the /proc -filesystem, so vnStat can be used without root permissions.

Installing:

# cd /usr/local/src
# wget http://humdi.net/vnstat/vnstat-1.4.tar.gz
# tar -zxvf vnstat-1.4.tar.gz
# cd vnstat-1.4
# make && make install
# vnstat -u -i eth0

Making vnstat root only:

# chmod 700 /usr/bin/vnstat
# chmod 700 /var/lib/vnstat/ -R

Now you can check the stats, use help for possible commands:

# vnstat –help

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