[Cflowd] Inconsistant data

[Shawn Armstrong]

The graphs are being generated using Flowscan and rrdtool.

Stats are coming from all outbound interfaces (verified using flowwatch)

Martin van den Nieuwelaar wrote:
> 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
> 

-- 
Shawn Armstrong                         Sr Network Engineer
Information Technology Services         Systems Services
University of Alaska                    Phone: (907) 474-5498
mailto:shawn.armstrong@alaska.edu       PGP Key: 0x8F79F610