Packet Traces

The packet traces consist of time-stamped records of packets, observed in certain passive measurement point. They can be useful for several purposes. First of all, the analysis of packet traces can provide some knowledge about the state and availability of network resources, which is essential for efficient traffic engineering and network dimensioning. Moreover, collecting packet traces collected in two measurement points constitutes a base for the passive method of QoS measurement. Finally, in-depth analysis of collected packet traces is necessary for developing and validating analytical models of traffic at the packet level.

Flow Traces

The flow traces contain the records of flows (identified by the pairs of IP addresses and port numbers), observed in certain passive measurement point. Flow-level traces are often collected in operational networks for the purpose of usage-based accounting. Moreover, they are important for the research on modelling the traffic on the flow, or connection level. 

QoS measurement results

The repositories of QoS results store the values of metrics of packet transfer quality (i.e. packet delay, packet delay variation, packet loss ratio) between certain two measurement points. The purpose of such measurement is e.g. to evaluate the QoS delivered to the customers of operational networks, or to perform trials for validation of new QoS mechanisms. The raw data sets of QoS results consist of collections of singleton values, obtained for the measurement packets transferred between considered measurement points.

HTTP traces

The HTTP traces consist of the records of HTTP messages captured in passive measurement point, which is usually located in some operational WWW server. The HTTP traces can be collected for the purpose of assessing the load imposed on the web server by the incoming user requests. Modelling traffic at the session level (where session is related with the user activity, resulting in the exchange of HTTP requests and responses) is considered as a difficult task. The HTTP traces can be essential in the work on new session-level traffic models. 

WEB based repositories

The last type of data in MOME repository is covered by the general category of web-based repositories. It includes for example the collections of measurement data of different types, commonly stored in a single repository.