network monitoring tool

I am looking for someone to recommend an free networking software to monitor windows service (restart a stopped service), send alert if service/device is offline. Have some kind of netflow, to tell top talkers or who is causing the problem on the network. I have used MRTG but it is limited.

thanks in advance
officertangoAsked:
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pablito70Commented:
I think what you are looking for is Nagios; if your devices are part of snmp community, you can use it for monitoring, virtually, everything.

The website is simply www.nagios.org

HTH
AkinsdNetwork AdministratorCommented:
PTRG - Free only for up to 10 devices
http://www.paessler.com/prtg/download

OPManager - Free only for up to 10 devices
http://www.manageengine.com/network-monitoring/download.html

or the dude
http://www.mikrotik.com/thedude

Nagios unfortunately is not free
Emmanuel AdebayoGlobal Windows Infrastructure Engineer - ConsultantCommented:
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pablito70Commented:
There is a free download for Nagios, in addition to commercial release:

http://www.nagios.org/download/core/
masnrockCommented:
Zenoss is another one that can be worked with...

www.zenoss.org is the site for their free Core edition.

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