WAN and LAN Network monitoring tools

Hello, I am looking for network monitoring tools for LAN and WAN are there any good reliable tools that can help make sure things are up and running.  I don't want it to be overly complex.. simple and reliable, if such a thing exists.
tucktechAsked:
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Steve BottomsSr Network AdminCommented:
PRTG is pretty good, and you have up to 100 "sensors" (node ping, node smtp, node ssl, etc) free.  Notifications can be customized fairly well.  We use the <=500 sensor license here to monitor key systems at two sites.  Good tool.  There are others that are free, others that are paid, some that are easy to set up, others that will be suggested that are *nix.  You didn't mention what platform you have, so my first thought is to PRTG.
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tucktechAuthor Commented:
Hello SteveInNv, Microsoft platform.
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madunixCommented:
MRTG/Cacti is good, PRTG is good as well. You can find also other tools check Zabbix Munin and OpenNMS ...etc. Cacti is a brilliant software beside nagios and MRTG ..... to narrow down the problem. I use Cacti , MRTG and Nagios, to monitor network services and servers, average time Web pages,  up-time, availability for free. The combination Nagios + Cacti. Nagios is been used for Alarms and Cacti for Trending/Graphs.
http://www.paessler.com/bandwidth_monitor
http://www.cacti.net/
http://www.gfi.com/downloads
http://zenoss.com/download
http://oss.oetiker.ch/mrtg/
http://www.groundworkopensource.com GroundWork Monitor Enterprise
http://www.hyperic.com Hyperic HQ
http://www.icinga.org Icinga
http://oss.oetiker.ch/mrtg/  mrtg
http://www.nagios.com and http://exchange.nagios.org/  Nagios
http://www.n-able.com N-central
http://www.op5.com op5 Monitor
http://www.open-itcockpit.com openITCockpit
http://www.opennms.org OpenNMS
http://www.hp.com/de/bto HP OpenView
http://www.bmc.com BMC PATROL ProactiveNet Performance Management
http://www.shinken-monitoring.org Shinken
http://www.ibm.com/software/de/tivoli IBM Tivoli
http://www.ca.com/de CA Unicenter
http://www.whatsupgold.com WhatsUp Gold
http://www.zabbix.com Zabbix
http://www.zenoss.com Zenoss Enterprise
http://www.manageengine.com/network-performance-management.html Opmanager
http://www.solarwinds.com solarwinds
http://www.adremsoft.com/netcrunch/ netcrunch
http://www.paessler.com/bandwidth_monitor
http://exchange.nagios.org/
http://nagios.sourceforge.net/docs/3_0/quickstart.html
http://www.howtoforge.com/installing-nagios-on-debian-lenny-and-monitoring-a-debian-lenny-server
http://www.howtoforge.com/nagios-installation-on-ubuntu-10.04-lucid-lynx
http://www.linuxjournal.com/article/6767
http://www.nagioswiki.com/wiki/index.php/Main_Page
http://m.linuxjournal.com/files/linuxjournal.com/ufiles/LJ191_UsingSMSforNagios.pdf
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eeRootCommented:
The SolarWinds free tools collection has a several options for basic network monitoring.  These are lite applications and usually do not have a database backend or complex installation.
http://www.solarwinds.com/products/solarwinds_free_tools/

If you want something for free that runs as a service 24/7, look at Observium, Nagios, Zenoss, or Zabbix.  If you want a paid for product, look at the pricey SolarWinds NPM and NCM
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tucktechAuthor Commented:
This is a great list and a lot to evaluate.  I am sure a lot of these would fit the bill.
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