I work at business that has several different smaller buildings on our campus. These buildings are connected back to the server room via Cisco switches and fiber trunk lines. From time to time I'll get users calling in about general network slowness (network, internet, etc).
I see we have plenty of bandwidth from our MRTG monitoring (netflow via the Cisco switches). When I check the properties of the trunk lines I see no collisions or deferred packets.
What I think I'm looking for is something like Wireshark in that it will capture network traffic, but I don't need it to store that information in an attempt to recreate it later. I need something that will capture the statistics of a large amount of packets so I can go back later (say after a week or so of capturing data) and see if there's any trends (dropped packets, congestion, etc).
I realize this could be one piece of software doing the collection and the analyzation, or two pieces, one for collection and one for analyzation. Any recommendations/clarifications are appreciated.