Thank you for detailed answer. Here's what I've got: 2Gb for just 5h 35m:
http://imageshack.us/a/img706/8040/2myr.pngMy Avalon is hosted in the datacenter and they are asking me to pay bills for this gigabytes (total 143 Gb for more than 1 month).
I have this in 24h:

RX: 15MB
TX: 9 MB
By the way, you have your systems sitting naked on the Interwebs without any firewalling? Eh yuck...
http://31.130.206.70/cgi-bin/luci