[Cflowd] Inconsistant data

[Martin van den Nieuwelaar]

Shawn Armstrong wrote:
> I've run into an inconsistancy that I can not explain, and was wondering 
> if someone may have some insight as to what's happening.
> 
> I'm currently monitoring all the links out of my institution with MRTG 
> as well as running Cflowd.  The graph created by MRTG shows current 
> traffic data as In: 40.1 Mb/s Out: 19.0 Mbps.  Cflowd graphs show In: 
> 16.2 Mb/s Out: 12.1 Mb/s.
> All the routers that I'm polling with MRTG are sending flow data to 
> Cflowd, so it's not an issue of routers being left out off the flow 
> data.  Also, we are not a transit network, so that's not an issue.
> Anyone have any ideas?
> 
> Thanks,

How are you creating CFlowd graphs?  CFlowd doesn't produce graphs as 
standard.

Depending on how many connections off your network you have it would 
be worth checking you are actually getting stats from every outward 
pointing interface.

I think the issue may lie with how the graphs are being generated. 
ie. there may be a flaw in the way the collected data is turned into 
the graph.  Garbage In, Garbage Out as they say.

Regards,

-Martin

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