What your looking for is something like netflow, which can be a little daunting to setup unless you have a semi-decent cisco or like router that can do flow exports. in this case look for something like cflowd (http://www.freshmeat.net has lots of good resources for this sort of thing) or the perl netflow collector (cant recall the exact url but a web search for it should find stuff)
Failing that, ntop and nacctd (netacct) may also provide you with the information you require.
-- Steve.
On Tue, 17 Aug 2004, Ryan Golhar wrote:
Unfortunately the switch is out of our control, and I don't have access to it. So, instead what I've done is used tcpdump to capture packets on the server and one of the workstations.
I tried using ethereal to generate some statistics from the tcpdump capture, but didn't get what I was hoping for. Basically, I'd like to break down the network usage hourly to see who is using up bandwidth, what the IPs are responsible. Web-based graphs would be nice to get quick overall views.
I tried searching on google for any tools that do this and surprisingly in the hugh lists that came back, none of them do this. Any one have any recommendations?
Ryan
-----Original Message----- From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Ed Wilts Sent: Thursday, August 12, 2004 11:11 AM To: golharam@xxxxxxxxx; General Red Hat Linux discussion list Subject: Re: Network monitoring tools
On Thu, Aug 12, 2004 at 10:43:09AM -0400, Ryan Golhar wrote:Can anyone recommend a good, free network monitoring tool?
I have a lab of about 20 Linux boxes connected to a switch. It seems like every once in a while, the performance of all the machines drops dramatically, and I believe its related to the network, as all the home directories are NFS mounted, but not sure where.
I'd like to get some sort of an idea of network usage and what is taking up the bandwidth.
It depends on the switch. If the switch is snmp-cabable, then install mrtg. You can then monitor the traffic on every switch port. Once you've got the port hammered down, use something like ethereal to figure out what the traffic is.
-- Ed Wilts, RHCE Mounds View, MN, USA mailto:ewilts@xxxxxxxxxx Member #1, Red Hat Community Ambassador Program
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