The issue at hand is that flows are sometimes received to describe a flow that had existed over a period of time in the past. rrd graphs make it difficult to add information about past information (you can only insert a new value every interval). In the use of rrdtool with nfsen there will be accurate flow volume graphs, but the other graphs correspond to reported packet and bit volumes for the flows reported within that interval, and not re-reported and averaged over the effective time of the flow. To fix this display problem would be an 'undertaking', but would lead to graphs and statistics closer to the actual conditions on the network. I think just getting a hold of alternate data (ie: cacti and snmp) for non-flow volumes may be easier. :)
Thanks, Steve Foley wrote: > 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? -- Scott Dier <[EMAIL PROTECTED]> ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Nfsen-discuss mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/nfsen-discuss
