What is a good, free network monitor?

My Cisco/Server 2003 network is crawling and I need to figure out what is going on?

Anybody have any experience with a decent monitor?
nhawkinsVAAsked:
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chouckhamConnect With a Mentor Commented:
Hello,

First of all lets break down the two parts that you want to look at:

Windows Servers:

You want to monitor some specifics using WMI (Windows Management Interface). There are hundreds of ways of doing this. Here are just a small handfull and my recommendations:

++ Performance Monitor (Built in to All Windows systems found in: Control Panel >>> Admint Tools >>> Performance Monitor). This allows you to monitor and graph and see exactly what is happening on your system with hundreds of pre configured metrics from CPU utilsation to Memory usage, etc.. You can even configure a second server to monitor the first one remotely.

There are many "Turn-key" solutions which you will need to pay for: MOM, HP OpenView, SolarWinds Orion Application Monitor, etc...

There are many Open Source, Freeware, Shareware software also such as: Nagios, Spiceworks, Cacti, etc...

My recommendation for a skilled linux/ windows admin would be to use such a system like Nagios Core or Cacti with a WMI Monitor plugin.


Network devices: (Cisco you mentioned)

SNMP (Simple Network Monitoring Protocol) is the way to go here, I would go out on a limb and say all Managed Network devices should support SNMP. Using this protocol you can "Poll" a device and request key information from it, such as: CPU Usage, Interface Statistics, and some more interesting things...

For this there are again a whole host of Commercial, Open Source, Freeware, Shareware options...

++Nagios
++Cacti
++HP OpenView
++Solarwinds Orion NPM
++Advanced HostMonitor
++IPSwitch WhatsUP
++RRD Tool
++Smokeping

I could type all day!

Hope some of that helps ;-)

-Craig
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matthewskyleCommented:
Have you tried Wireshark?
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Istvan KalmarHead of IT Security Division Commented:
What shows the logs?
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nhawkinsVAAuthor Commented:
Which logs are you referring to?
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Istvan KalmarHead of IT Security Division Commented:
the cisco devices
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mikegattiCommented:
Can you give us an idea of the size of the network, how many switches, routers, servers, clients?
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Ernie BeekConnect With a Mentor ExpertCommented:
Browse through this link: http://www.experts-exchange.com/Software/System_Utilities/Q_26748566.html?cid=748#a34841205 

There must be something you can you there.
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Ernie BeekExpertCommented:
Mm, second you = use
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Kamran ArshadConnect With a Mentor IT AssociateCommented:
Hi,

Read the syslogs of your Cisco and other Network devices using syslog analyzer. Check for any errors. Then turn ON port spanning and monitor the traffic using Wireshark. Also scan all machines for malwares,adwares, trojans and viruses.

www.wireshark.org
wiki.wireshark.org
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inspagibCommented:
I suggest free version of PRTG

http://www.paessler.com/prtg/download

You can setup up to 10 different sensors in free version.
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nhawkinsVAAuthor Commented:
Thanks!
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