[IT-SecurityNotifies] SW to monitor band usage

[Leonardo Boselli <leo AT dicea.unifi.it>]

Problem: i have doubts on the uplink provider.
my network is often sloooooooow .
doing ping test gives values high, but not so high to justify
 the slownes. i tried to upload a file to a server on isp site and a 200 
MB mpg file was trasferred in 5.2 seconds. 
the line should be 1GB, and were about 400 users on line, so such score
should exclude a cable or router fault.
The technician on the other part of the line  suggest it could be someone 
doing intensive file transfer, so hogging the line.
so i want to make this test:
mirror the upstream port of the main switch to a logging computer, and see 
if there is someone doing 24/24 file transfer.
now the question:
what is the program i have to use ?
(remember: on that line I should expect a 70% bandwidth usage on a gigabit 
link)
What I need would be just log, minute by minute, for each IP pair (in and 
out) the number of packet and the total qty of data exchanged.
any quick suggestion ?

--
Leonardo Boselli


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