[CentOS] Switch to measure traffic at IP level?

Neil Aggarwal wrote:

> I just need something that gives me a usage graph
> at daily, weekly, and monthly intervals with a 95%
> line.

Don't use RRD for billing 95% it will not be accurate
as RRD averages values over time. I use rtg (not mrtg,
but rtg) together with SNMP to get accurate 95% readings
at the interface/port level.

sflow is also a sampling mechanism, but it is pretty
accurate depending on the interval, you can see this
site for accuracy on sflow:

http://www.sflow.org/packetSamplingBasics/index.htm

If your just using rrd for casual monitoring, no problem
but if your using it for billing at 95% then be
careful.

nate