Queuing delay tomography of the Internet is mostly a theoretical research topic, and measurements... more Queuing delay tomography of the Internet is mostly a theoretical research topic, and measurements were mainly performed to prove the validity of a certain measurement methods. We propose a large scale Internet tomography survey to map the queueing delay in the European networks in great details, and the rest of the world to a lesser extent. The measurements will be based on the ETOMIC high accuracy packet capturing infrastructure and on DIMES vast distributed agent community. We present the rational behind the effort, the new technical tools developed to enable it, and some results from initial trials.
In this paper we show how to go beyond the study of the topological properties of the Internet, b... more In this paper we show how to go beyond the study of the topological properties of the Internet, by measuring its dynamical state using special active probing techniques and the methods of network tomography. We demonstrate this approach by measuring the key state parameters of Internet paths, the characteristics of queueing delay, in a part of the European Internet. In the paper we describe in detail the ETOMIC measurement platform that was used to conduct the experiments, and the applied method of queueing delay tomography. The main results of the paper are maps showing various spatial structure in the characteristics of queueing delay corresponding to the resolved part of the European Internet. These maps reveal that the average queueing delay of network segments spans more than two orders of magnitude, and that the distribution of this quantity is very well fitted by the log-normal distribution.
The NOVI Information Model (IM) and the corresponding data models are the glue between the softwa... more The NOVI Information Model (IM) and the corresponding data models are the glue between the software components in the NOVI Service Layer. The IM enables the communication among the various components of the NOVI Architecture and supports the various functionalities it offers. The NOVI IM consists of three main ontologies: resource, monitoring and policy ontology that have evolved over time to accommodate the emerging requirements of the NOVI architecture. This article presents the NOVI IM and its ontologies, together with an overview of how the NOVI software prototypes have benefitted from using the IM.
ETOMIC is a network traffic measurement platform with high precision GPS-synchronized monitoring ... more ETOMIC is a network traffic measurement platform with high precision GPS-synchronized monitoring nodes. The infrastructure is publicly available to the network research community, supporting advanced experimental techniques by providing high precision hardware equipments and a Central Management System. Researchers can deploy their own active measurement codes to perform experiments on the public Internet. Recently, the functionalities of the original system were significantly extended and new generation measurement nodes were deployed. The system now also includes well structured data repositories to archive and share raw and evaluated data. These features make ETOMIC as one of the experimental facilities that support the design, development and validation of novel experimental techniques for the future Internet. In this paper we focus on the improved capabilities of the management system, the recent extensions of the node architecture and the accompanying database solutions.
Queuing delay tomography of the Internet is mostly a theoretical research topic, and measurements... more Queuing delay tomography of the Internet is mostly a theoretical research topic, and measurements were mainly performed to prove the validity of a certain measurement methods. We propose a large scale Internet tomography survey to map the queueing delay in the European networks in great details, and the rest of the world to a lesser extent. The measurements will be based on the ETOMIC high accuracy packet capturing infrastructure and on DIMES vast distributed agent community. We present the rational behind the effort, the new technical tools developed to enable it, and some results from initial trials.
In this paper we show how to go beyond the study of the topological properties of the Internet, b... more In this paper we show how to go beyond the study of the topological properties of the Internet, by measuring its dynamical state using special active probing techniques and the methods of network tomography. We demonstrate this approach by measuring the key state parameters of Internet paths, the characteristics of queueing delay, in a part of the European Internet. In the paper we describe in detail the ETOMIC measurement platform that was used to conduct the experiments, and the applied method of queueing delay tomography. The main results of the paper are maps showing various spatial structure in the characteristics of queueing delay corresponding to the resolved part of the European Internet. These maps reveal that the average queueing delay of network segments spans more than two orders of magnitude, and that the distribution of this quantity is very well fitted by the log-normal distribution.
The NOVI Information Model (IM) and the corresponding data models are the glue between the softwa... more The NOVI Information Model (IM) and the corresponding data models are the glue between the software components in the NOVI Service Layer. The IM enables the communication among the various components of the NOVI Architecture and supports the various functionalities it offers. The NOVI IM consists of three main ontologies: resource, monitoring and policy ontology that have evolved over time to accommodate the emerging requirements of the NOVI architecture. This article presents the NOVI IM and its ontologies, together with an overview of how the NOVI software prototypes have benefitted from using the IM.
ETOMIC is a network traffic measurement platform with high precision GPS-synchronized monitoring ... more ETOMIC is a network traffic measurement platform with high precision GPS-synchronized monitoring nodes. The infrastructure is publicly available to the network research community, supporting advanced experimental techniques by providing high precision hardware equipments and a Central Management System. Researchers can deploy their own active measurement codes to perform experiments on the public Internet. Recently, the functionalities of the original system were significantly extended and new generation measurement nodes were deployed. The system now also includes well structured data repositories to archive and share raw and evaluated data. These features make ETOMIC as one of the experimental facilities that support the design, development and validation of novel experimental techniques for the future Internet. In this paper we focus on the improved capabilities of the management system, the recent extensions of the node architecture and the accompanying database solutions.
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Papers by József Stéger