Despite ntop has implemented rich network metrics over the years, the two most important metrics that people keep asking us are volume (how much) and time (how long). Timeseries offer a quick view of the traffic and allow people to immediately spot traffic peaks or absence of transmissions. They are good for traffic analysis but […]
How we have Decreased ntopng Memory Usage by more than 60%
In this blog post we want to shave our experience squeezing ntopng memory usage to fit into small OT monitoring devices manufactured by our partner Endian. Just to give you an idea of the work we did look at these two images taken on the same network at the same time of the day, before […]
HowTo Analyse NetFlow/IPFIX/sFlow pcap Traces
Dumping sFlow/NetFlow/IPFIX flows in pcap format can be very useful for troubleshooting or for creating a compact traffic dump. For instance you can dump flow traffic with n2disk (wireshark, or tcpdump) and store them in pcap format, and eventually share them with a shared disk or sent via email. Flows are usually analysed live with […]
Introducing ntopng Customised Reports
In ntopng 6.0 Dashboard and Traffic Reports have been completely redesigned and rewritten from scratch with a new, flexible engine which is template-based. In a previous webinar we demonstrated how cute and powerful the new engine is, with the ability to automatically generate periodic reports, and with the promise of releasing a graphical editor for customising […]
HowTo Monitor SNMP Interfaces Utilisation and Congestion Rate
Recently, we added the ability in ntopng to monitor link utilisation using NetFlow/IPFIX. In this post, we want to show you how we further improved those functionalities by leveraging SNMP to monitor the status of many devices (interfaces) simply. SNMP is a well-known protocol used for monitoring network devices, and ntopng uses it to poll […]
How Sampling and Throughput Calculation Works: NetFlow/IPFIX vs sFlow vs Packets
ntop tools are able to collect various type of flows NetFlow/IPFIX (including dialects such as J-Flow, NetStream) and sFlow/NetFlowLite, this in addition to packet capture/processing. We have decided to seamlessly handle all these formats so that the user does not have to know the inner details of them. so what you do is the usual […]
HowTo Monitor Network Interface Usage with NetFlow/IPFIX
SNMP is the de-facto protocol for monitoring network devices. Using it, it is possible to monitor “how much” a link is used. What is missing is “how” a link is used. Namely if my Internet link is full, what is the device, protocol, application that is using it? ntopng was created to answer this question […]
Securing ClickHouse and MySQL Flow Storage
ntopng stores flows data in various databases including MySQL, Elastic and ClickHouse that is the database storage that we have selected as it outpaces the others in terms of speed and reduced disk space. ClickHouse is a columnar database and while it is very fast during data access, it is optimised for batch data insertion. […]
ntopng 6.0 Webinar
Last week we have released ntopng 6.0 that contains many new features and a redesigned user interface. Goal of this webinar is to walk through this new release and show a demo of all the major changes we have introduced. These are the presentation slides, and below you can see the video recording. Enjoy […]
How ntopng Merges Vulnerability Scan with Traffic Monitoring for Better Cybersecurity
ntopng was initially designed as a passive traffic monitoring tool. Over the years we have added active monitoring features such as network discovery, SNMP, and now vulnerability scan. A network vulnerability scanner is a tool designed to identify vulnerabilities (often know as CVEs) in network services such as a web or SSH server by performing […]