Use of internet bandwidth

[Gerolamo Valcamonica]

Hi everybody
I need to monitor the use of internet bandwidth of every customer on my 
platform.

Measuring the internet bandwidth use outgoing the virtual routers could 
be the best practice to do that

The problem is that the virtual routers are created by CloudStack out of 
the box without snmp services

So.. do you have any ideas for internet usage measurements by costumer 
account?

P.S.
I use Zabbix as monitoring system

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Gerolamo Valcamonica