Quoting Raymond Norton (admin at support.lctn.k12.mn.us):
> I have a tech on one of our LAN's asking me for a software tool to monitor
> his network. He feels something is awry, and is asking me to help him find
> areas of congestion, services running, and bandwidth used. Is there a tool
> with a GUI for this?

Basic "integrated" tool: Netsaint <www.netsaint.org>
Advanced "integrated" tool: OpenNMS <www.opennms.org>

roll-your-own:
  mrtg <http://people.ee.ethz.ch/~oetiker/webtools/mrtg/>
  rrdtool <http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/>
  cricket <http://cricket.sourceforge.net/>




-- 
Bob Tanner <tanner at real-time.com>         | Phone : (952)943-8700
http://www.mn-linux.org, Minnesota, Linux | Fax   : (952)943-8500
http://www.tcwug.org, Minnesota, Wireless | Coding isn't a crime. 
Fingerprint: 02E0 2734 A1A1 DBA1 0E15  623D 0036 7327 93D9 7DA3