Bandwidth Monitoring
This isn't really a linux question as much as a networking question, but here goes.
Say I have a server rack that I lease out to others. I need a way to monitor each persons bandwidth usage. How can I do this without installing software on their machines or disrupting traffic flow?
NOTE: I have no access to the router, as it is owned by the colo company. I do have access to the switch and firewall, as well as my machines (linux) on the rack.
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