FlowViewer vs ntopng

FlowViewer is free software for analyzing NetFlow data exported by an organization’s network devices. Its interface works with Carnegie Mellon’s SiLK software and also supports the older flow-tools collector. The toolset combines FlowViewer for text reports, FlowGrapher for charts, and FlowMonitor for longer-term traffic monitoring. It supports NetFlow versions 5 and 9, including IPv6, and offers filtering by address, port, interface, autonomous system, TOS, TCP flags, protocol, and next hop. More than 30 reports are available, and reports and filters can be saved. FlowGrapher charts bits, flows, and packets per second over a selected period; FlowMonitor provides RRD graphs for filtered traffic, with views from 24 hours to 3 years. Dashboards can give groups such as Security and Operations separate live views. FlowViewer is listed for Linux and web use and can be installed on a dedicated Unix server or virtual appliance; the software requires a Unix server. The free plan is free. Paid options include hourly support at a price agreed with the maker, router configuration at $500, paid once, training at $500, paid once, and installation at $750, paid once.

ntopng monitors network traffic gathered from traffic mirrors, NetFlow exporters, SNMP devices, firewall logs and intrusion detection systems. Its encrypted web interface supports real-time and historical traffic exploration. Protocol detection powered by nDPI covers more than 450 Layer-7 application protocols, while metrics include application latency, round-trip time, throughput, TCP retransmission, packet loss, and VoIP jitter and MOS. It captures packets with libpcap or PF_RING and collects flows from nProbe, NetFlow and sFlow exporters. An HTTP-based RESTful API and Lua scripting are listed. Platforms include Linux, FreeBSD, Windows x64, macOS and RaspbianOS; pfSense and OPNsense are also named among supported Unix platforms. The free Community edition suggests limits of 256 live local hosts, 128K live flows and eight monitored interfaces. Paid perpetual licenses include one year of maintenance: Pro is €299, paid once, Enterprise M is €699.95, paid once, Enterprise L is €899.95, paid once, and Enterprise XL is €1,499.95, paid once.