vnstat: vnStat (a console-based network traffic monitor)
vnstat:
vnstat: vnStat is a network traffic monitor for Linux that keeps a log of daily
vnstat: network traffic for the selected interface(s). vnStat isn't a packet 
vnstat: sniffer. The traffic information is analyzed from the /proc filesystem,
vnstat: so vnStat can be used without root permissions. This program is open
vnstat: source (GPL) and can be installed in 'single' and 'root' mode. 
vnstat:
vnstat: homepage: http://humdi.net/vnstat/
vnstat:
vnstat: