https://www.paessler.com/Download_PRTG/30_Day_Trial
赞助Monitor your entire LAN and WAN, devices, servers, bandwidth, availability, traffic, etc. PRTG uses SNMP, Packet Sniffing, NetFlow, and other flow protocols for monitoring your LAN
Types: PRTG Network Monitor, PRTG Enterprise Monitor, PRTG Hosted Monitor