From: Samuel (firstname.lastname@example.org)
I am trying to use nTop 2.1.56 to monitor the traffic over my network using
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...
This archive was generated by hypermail 2.1.4 : 03/24/03 PST