Hosting and monthly traffic

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I have a server with Fedora Core 5 housed in a web farm. It's for my
business only.
Some customers I work with are asking me to host them on my server. My
housing provider give me limited bandwidth (30GB mothy).
If I give space and bandwith away (not for free ;) I shall start
tracking monthly usage of my hard disk space (quota?) and bandwith.
How can I get bandwith usage under control and invoice customers if
they exceed a given limit?
Thanks in advance,
Luca M.

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