Network monitoring tools

[Ryan Golhar]

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 at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of Ed Wilts
Sent: Thursday, August 12, 2004 11:11 AM
To: golharam at umdnj.edu; 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 at ewilts.org
Member #1, Red Hat Community Ambassador Program


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