Network bandwidth monitor

We are experiencing periodic network slowdowns so, I'm looking for a reasonably priced or free software tool to measure broadcast traffic, etc.  Know the hardware tools work great but are very expensive.  Any help would be appreciated.
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Aaron TomoskySD-WAN SimplifiedCommented:
What type of switches and routers? Solarwinds has some free tools, and prtg is free for up to 10 monitors I believe.

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Fred MarshallPrincipalCommented:
PRTG free version works well.  It helps to have managed switches, etc.  using SNMP
Garry GlendownConsulting and Network/Security SpecialistCommented:
How far do you need to drill down into the type of traffic? If all you need to see is which ports are causing traffic, something simple like MRTG (free Unix tool) might already be sufficient. For a more detailed look, you would need to run some Netflow/SFlow tool (e.g. NFSen) ...
madunix (Fadi SODAH)Commented:
MRTG/Cacti is good, PRTG is good as well. Check the following list: GroundWork Monitor Enterprise Hyperic HQ Icinga  mrtg and  Nagios N-central op5 Monitor openITCockpit OpenNMS HP OpenView BMC PATROL ProactiveNet Performance Management Shinken IBM Tivoli CA Unicenter WhatsUp Gold Zabbix Zenoss Enterprise Opmanager solarwinds netcrunch
WebccAuthor Commented:
Thanks guys.
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