2002 - cesnet

The model of creating regular non-aggregated hourly tables from which aggregateddaily, weekly, and monthly tables are compiled is completed and verifiedby tests. The number of individual tables is theoretically limited only by thedisk space available. However, it can be restricted by configuration as well. Forexample, it is possible to define that we want to have hourly tables for the last3 days available plus tables with aggregated data – for example daily tables forthe last 14 days, weekly tables for the last 6 weeks, and monthly tables for thelast 2 years.The model in which tables are divided into tables with aggregated and non-aggregatedinformation is useful for various user views. Network administratorsoften need to view detailed information on network activities in the last hour. Inthis case, it is useful to look at an hourly table.At other times, it is important to have a global overview of the network trends,including, for example, information about the proportional share of individualprotocols within one day, week, or month. It is better to generate these overviewsfrom pre-prepared daily, weekly, or monthly tables, which do not need tocontain detailed information.15.2 NetFlow MonitorThe second component of the system for NetFlow statistics processing is writtenin the PHP programming language. Its goal is to present results in a userfriendlymanner, create graphs and statistics, and – last but not least – to alloweasy configuration of NetFlow Collector and NetFlow Event via the Web.At the beginning of the year, we completed the basics for a new user interface,which allowed easy creation of new dynamic Web pages in the future. The existingWeb interface is comprised of seven main menus: Main, Tables, Graphs,Events, Statistics, Options and Help.The Main menu contains a basic search for information about data flows, IP addressesand autonomous systems, etc. In the Tables and Graphs menu, optionsfor the management of predefined profiles for searching criteria used to generatetables and graphs will be provided. The Events menu allows the managementand viewing of events that are generated by NetFlow Collectors.Under the Statistics item, you can find options for getting information on statusesof individual processes, sizes and statuses of individual tables, etc. The Optionsitem contains all settings of the entire system. Here, it is possible to create users,allocate access rights, add new Collectors, etc. The Help menu, unfortunately,remains empty for now. We hope that we will manage to complete the entireonline documentation for the whole system in 2003.170 High-speed National Research Network and its New Applications 2002