Please recommend a network analysis tool

I'm running an SBS 2008 machine (DC) with about 15 Win XP Pro/Win 7 Pro worksations.

Several workstations today were having network problems.  Hosted Exchange connection dropping, Remote Desktop to an off-site server disconnecting.  Etc, etc.

I can't tell if the problem is inside our outside our building.

Is there any good free or inexpensive monitoring utility that might point the way to network issues?

Thanks.
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DaveWWWAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
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FastSiCommented:
Agreed wireshark is a great tool I would also suggest this it will allow you to filter on specific source and destination addresses and ports, as well as protocols and filter out any noise traffic.
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naughtynatConnect With a Mentor Commented:
wireshark isnt the easiest tool to use, but its probably one of the best.

but its not for the fainthearted. Well it my limited experience.

One option would be to use iphost monitor software, as this is supereasy to setup and you can see if different devices are dropping in and out on the network

http://www.iphostmonitor.com/

This might be a basic place to start from.
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naughtynatConnect With a Mentor Commented:
One other one I am yet to try but think it would be a good basic alternative to wireshark is IPMon

http://4sysops.com/archives/free-ipmon-monitor-ip-traffic/

Cheers

Nat
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DaveWWWAuthor Commented:
Thanks - those were great suggestions.  For me, simpler is better! :-)
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