Need Utilities to Monitor and Diagnose LAN Issues

What open source or free utilities can I use to monitor, discover, and diagnose LAN problems?  Latency is one area that I need to focus on.

LAN specs: ~50 client PCs, running mostly WinXP but a few OSX Macs, 6 servers Win2k/2003 mix with two XServes and one Irix box.


Thanks,

Ben
roberts0909Asked:
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rindiCommented:
One such utility is ethereal:

http://www.ethereal.com/

or nagios:

http://nagios.org/
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michkoCommented:
Spiceworks is another:
http://www.spiceworks.com/
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