In ntopng we have implemented various techniques for analysing historical traffic. This post shows you the options available: In timeseries you can see the current traffic rate (line) or the traffic rate of the previous period of time (dotted). This allows you to visually analyse when traffic deviates from previous period of time (see for instance in the chart below the traffic drop happened at 10 AM). 2. You can trigger interface alerts based on statistical traffic analysis (exponential smoothing) when traffic exceeds (up/down) its baseline. Note that when this …

Recently ntopng has been used in academia for detecting DoS (Denial of Service) attacks using NetFlow flows. In this thesis (note that the document it is written in Italian) it is shown how ntopng has been successfully used collect flow and use them to detect DoS attacks. Enjoy ! …

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 are too complex for producing accounting data and comparing usage overtime. For this reason ntopng provides for each local host an additional feature that allows you to see immediately the amount and time that a …

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 and after our work. As you can see we managed to squeeze the memory from 4 GB to 1.3 GB. Below we describe how we did it. The challenge was to reduce memory usage while …

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 it, and let everyone to create its own traffic view on both historical and live traffic data. The graphical editor has been implemented and it is available in ntopng 6.1 (and later versions). In this …