Hello, I am trying to use nTop to monitor the traffic over my network using SFlow. I use nTop has a collector for the S-Flow packets sent by my router. Packet sampling rate is 1 per 512 packets.
The nTop SFlow plugin should be correctly configured as the sFlow collector. But I get strange results: For instance, I tried to send a 1 GB file at 1 MB/s on the network. nTop reports the following : Stats / Throughput : Current / Peak ~ 2 Kbps Total Data Sent : 1536 packets = 215.2 KB I don't understand those results, I was expecting to have: total_size_sent * sampling_rate = total_size_received_by_ntop but actually we have here total_size_sent * sampling_rate = 2048 KB which has nothing to do with total_size_received_by_ntop... But, if we assume an IP packet size is about 1448 bytes, then we have: packets_sent = 1 GB / 1448 bytes and I observed indeed: packet_sent * sampling_rate ~ packets_received_by_ntop So, why the size (and the speed) is wrong ? Does anyone here has managed to use ntop with sflow correctly ? Thanks for your help... Samuel. _______________________________________________ Ntop mailing list [EMAIL PROTECTED] http://listgateway.unipi.it/mailman/listinfo/ntop
