[CentOS-virt] how to monitor each VM's traffic?

Rudi Ahlers wrote:
> I'm looking for something similar to Cacti / MRTG - but something that
> can graph traffic for each IP / VM on a server

humm... Cacti or mrtg would work fine if it targets the interface and 
the resources on the inside of the vm. for all purposes it should not 
matter if the machine is virtual or not.

Or am I missing something ?