> Does anyone do that? We currently just have the mrtg 95th percentile
> hack, and I really can't verify it's accuracy.
They're completely different. A 95th percentile deals with data rates,
but netflow measures the amount of data downloaded.
95th percentile data from MRTG is not really going to be an accurate
indication of throughput, for various reasons:
* it's usually sampled at a 5-minute interval. This is far too large for
a decent 95th-percentile measurement.
* The consolidation used on MRTG can sometimes mask what is really going
on. In order to get an accurate picture over a period of a month or so,
you need to keep all of your samples, rather than consolidating them
into smaller samples as MRTG does, which ends up being a lot of data.
We use a combination of the two technologies - a 95th percentile of SNMP
polls to customer endpoints for calculating bandwidth, and netflow data
for actual amount of data downloaded. Seems to work quite well. Our SNMP
polls are far more frequent than 5 minutes, though.
Regards,
Leigh
Leigh Sharpe
Network Systems Engineer
Pacific Wireless
Ph +61 3 9584 8966
Mob 0408 009 502
Helpdesk 1300 300 616
email [EMAIL PROTECTED]
web www.pacificwireless.com.au
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Charles
Sprickman
Sent: Wednesday, 24 October 2007 1:20 PM
To: [email protected]
Subject: [Flow-tools] billing from netflow data?
Hi all,
Does anyone do that? We currently just have the mrtg 95th percentile
hack, and I really can't verify it's accuracy.
We've got the same data in flows, anyone run across a tool to pull usage
data easily for a specific IP and/or interface? Right now I'm just
arguing with an upstream that is showing about 10Mb/s more usage than
what
we're measuring...
Thanks,
Charles
___
Charles Sprickman
NetEng/SysAdmin
Bway.net - New York's Best Internet - www.bway.net
[EMAIL PROTECTED] - 212.655.9344
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