HOWTO Monitor internet upload / download totals but NOT LAN traffic

[fishfork]

This is for those of you, like myself, on metered connections with a monthly cap. I've put the HowTo on the Wiki, for ease of editing - feel free to add to / modify it:

HowTo Monitor Internet Traffic Totals (https://wiki.ubuntu.com/HowToMonitorInternetTrafficTotals)

Let me know how you get on!