Bandwidth Usage Billing

[Max Clark]

Hi all,

So it's pretty common for ISPs to do usage based bandwidth billing (GB 
Transfered and 95th Percentile), my question is... how do you set this up?

MRTG is the defacto snmp bandwidth monitoring tool, however it does not 
track total GB transfered and the 95th percentile without external 
hacks, and even with this, your data will be truncated rather quickly.

How does one set up a bandwidth billing system (are there systems 
already out there for this) to track their customer's usage?

Thanks in advance,
Max