On my systems, I have some very fixed, low-bandwidth satellite links.  
With my old MRTG-like, poll-ifInOctet.x-every-minute routine, I seemed  
to have very accurate numbers that never exceeded my bandwidth cap.  
When I setup nfsen with filters for these same interfaces (IN IF x), I  
do get some values that spike over my known cap. Nothing seems to be  
sustained above the cap, but I do see some spikes that are clearly not  
quite right. The rest of the data seems to correlate with my old  
system fairly well (other than only being 5 minute intervals on  
nfsen...wish it could be 1min...) Id love to know what's up with the  
values that are obviously wrong, but I havent had a chance to dig into  
it.

-Steve

On Oct 23, 2008, at 8:06 AM, cp wrote:

> Can anyone explain to me why my traffic graphs and the actual  
> bandwidth usage on my circuit are different values? My goal is to  
> find how much inet(ipv4) and mpls traffic I’m pushing. I’m using  
> juniper gear and my rate is 100 and my run-length is 10 which means  
> I’m sampling 10% of my traffic? I see my interfaces moving about 20m  
> total and my graph shows about 3m of ipv4 and 1m of mpls. I can only  
> export a single netflow version on a given box, therefore I have one  
> router set up to export version 9 and one version 5 on a circuit  
> between the boxes(PE to P link). How accurate are these graphs  
> values to the actual usage? Am I missing something?
>
> Thanks,
> CP
>
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