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Network traffic accounting of Xen VMs

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http://serverfault.com – How do I monitor network traffic usage on Xen virtual machines running on Debian GNU/Linux Squeeze? I have a number of Xen virtual machines (domUs) running on a few physical machines (dom0s). Each domU can be started on or live-migrated to one of the physical machines. I would like to monitor and account how much network traffic is used on each domU. That is, how many bytes are being sent and received per month, week, day, hour. I thought this would be a pretty common task for system administrators using virtual machines on Linux, however, I have not been able to find any easy way of doing (HowTos)