An advanced, easy-to-use network monitoring solution. Features include: up/downtime monitoring, traffic and usage monitoring, analysis and reporting. SNMP, WMI, Packet Sniffing, VMWare, Email-Monitoring and NetFlow data acquisition methods are supported. Users can monitor their networks using more than 40 sensor types. Alerts are sent as soon as a network outage occurs. PRTG Network Monitor is available in both Freeware and Commercial editions....
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This download (PRTG Network Monitor) is freeware. "Freeware is copyrighted computer software which is made available for use free of charge, for an unlimited time, as opposed to shareware where the user is required to pay (e.g. after some trial period or for additional functionality)." More info at
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