Freeware

... features include: up/downtime monitoring, traffic and usage monitoring, packet sniffing, in-depth analysis and concise reporting. A user-friendly ... usage data acquisition are supported: SNMP and WMI, Packet Sniffing, and NetFlow. PRTG Network Monitor includes more than 30 sensor types for all common network services (e.g. PING, homepage SMTP, POP3, FTP, etc.), ...
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