Setup vnstat in Archlabs

1. install vnstat and net_manager.
2. vnstat --iflist
3. sudo vnstat -i wifi adaptor
4. sudo systemctl start vnstat.service
5. sudo systemctl enable vnstat.service

Usage: vnstat -d -i wifi adaptor
            vnsat -q
            vnstat -l
            vnstat --help

Setup vnstat in Mageia 5

1. install vnstat and net_manager.
2. sudo vnstat -u -i wifi
3. sudo service vnstat start
4. chkconfig vnstat on