Hello nfsen community, We are using nfsen to monitor bandwidth from a Nokia 7750 SR-7s which is sending cflowd v9 data to the nfsen server. We have checked that the sampling rate is the same in the server configuration as in the router. Also active timeout is set to 1 minute while inactive timeout is 15 seconds. So there should not be any flow lasting longer than the 5 minute default graph points interval of nfsen wright?
The packet bandwidth graphs are showing a spiky behavior and values 8 or more times bigger than what we see in SNMP graphs. After changing the template-retransmit timer from 600 seconds to 10 seconds, there was a big smoothing in the graphs and the BW difference was reduced from 8x to 2-3x times. I cannot get an idea of why a change in this retransmit timer could make any difference! Appreciate any hint about how does nfsen calculates the value of each average point for the bandwidth graphs. As I did it manually taking tcpdump information and performing a octects sum of all data received in 5 minutes * 8 to convert to bits * sampling rate to scale it up / 300 seconds to get the average --> This value is FINE and very similar to SNMP data. Appreciate any ideas about what could be happening here! Thanks! Martin.
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