ABSTRACT
This paper describes the proposal of a priority flow oriented design of the Ksensor architecture. Ksensor is a multiprocessor traffic capture and analysis system for high speed networks developed at kernel space. While the current architecture permits the capture and analysis of data flows, there are several scenarios where it does not perform adequately to achieve this goal, for example, if a certain type of traffic is more valuable than others. Thus, this work pursues the design that allows Ksensor to provide data flow treatment to a larger extent. This improvement will allow the new architecture to provide more reliability in data flow capture and processing.

ABSTRACT
This paper deals with the analysis of user perceived visual quality for mobile multimedia services. H.264/AVC is selected for low resolution video encoding, and 3G UMTS is considered for mobile data services. From subjective tests results, the combined impact of different service– and network–level parameters is inferred. As a result, different cross–layer adaptation alternatives are proposed to maximize the perceived quality level under different service conditions.

ABSTRACT
The growth of emerging multimedia applications with different quality requirements has made the objective network QoS (NQoS) to be commonly considered as an inadequate metric for quality assessment in telecommunication services, being the quality of experience (QoE) concept the most predominant alternative. However, most QoE-related research studies are service-specific, not easily expandable to other multimedia services and unsuitable for tuning up network management procedures. Instead, we propose an integrated QoE management model and a calculus process that estimates final user-satisfaction over multi-service scenarios and identifies those elements that have a greater impact on users' QoE. In order to evaluate this impact, new VoIP and video perception assessment methods were developed, while state-of-the-art methods were used for web and online game services. The effectiveness of the model is demonstrated by applying a stepwise multiple linear regression method to identify both subjective and objective bottlenecks in the network.

ABSTRACT
Quality of service has become one of the most important factors among Internet service providers. The implementation of appropriate QoS policies is essential in order to maintain customer loyalty and fulfill regulators' requirements. ITU-T recommendation E.802 provides a framework for the identification of QoS criteria relevant to users and ISPs. This Recommendation also provides guidelines to derive measurable QoS parameters from identified criteria. This article presents a QoS management model and implementation methodology for ISPs. We ground our investigation on the E.802 framework, which ISPs may face when implementing ITU-T Recommendation G.1000. The proposed methodology is meaningful for users, vendors, and network operators. Furthermore, its conformance with the ITU-T standard makes it suitable and deployment-ready for both regulators and providers.

ABSTRACT
The advent and rise of broadband technologies and new applications and services have led to a complex heterogeneous scenario in which providing Quality of Service (QoS) has become a compelling issue. Furthermore, the competitive condition of the telecommunications environment has caused user’s perception of quality to become one of the most differential factors for service providers. Due to this fact, QoS must not only attend to specific technical metrics, but more important, QoS criteria should be defined to assure the level of quality to fulfil the users’ requirements. In this new context, the definition of effective user-oriented QoS management models and frameworks has become a matter of contention. This chapter aims to provide readers a comprehensive analysis of the entire significance of a user-centered approach for quality of service management. For this purpose, a review of the most important issues related to the subject is provided.

ABSTRACT
Simulation models have been developed in order to foresee characteristics of networks, systems or protocols when carrying out tests in laboratories is very expensive or even impossible. This paper presents a simulation model of a multiprocessor network traffic analysis system. The model, which is based on closed networks of queues, evaluates the efficiency of the system depending on the hardware/software platform features. Therefore, this model is able to estimate performance early in the design and development stages simulating a multiprocessor architecture in charge of analysing network traffic. The goodness of the model will be checked by comparing analytical results with practical ones obtained in laboratory using a traffic analysis system that runs on a multiprocessor platform.

ABSTRACT
Este artículo trata sobre los esquemas de distribución de contenido multimedia a través de Internet, con especial interés en Internet móvil. Tanto la variabilidad de la calidad de los accesos radio como el incremento del tráfico multimedia plantean nuevos retos en relación a la gestión dinámica de los servicios sobre recursos de red compartidos. En primer lugar, el artículo ofrece una revisión del estado de la tecnología relacionada con el transporte multimedia extremo a extremo. A continuación, el artículo se centra en analizar la evolución de los mecanismos de adaptación dinámica, incluyendo desde esquemas extremo a extremo hasta la gestión dinámica de los recursos de red. Se analizan las posibles ventajas asociadas a nuevas arquitecturas como la computación en la nube móvil y las futuras redes 5G. Finalmente, el artículo identifica una serie de retos y desafíos en la gestión adaptativa de los servicios multimedia en el futuro.

ABSTRACT
Due to the fact that, nowadays, it is possible to capture traffic in 1-10 Gigabit Ethernet networks using commodity hardware, many traffic monitoring systems, and especially capturing tools, have been proposed in recent years. This paper presents a comparison between two software probes named Adviser and Ksensor. Both of them are multi-processor systems and are built over conventional hardware. However, while Adviser is designed in user space, Ksensor runs in kernel space. This work compares the performance results of the two probes considering several capture engines (NAPI, PF_RING with DNA, PFQ) and, at the same time, different application or analysis loads. The evaluations of the probes with the different settings have been performed on the same hardware multi-core configuration. The results of the evaluations let conclude which solution is better in each situation and which solution must be discarded.

ABSTRACT
Packet capturing and analysis in high-speed networks, like 1-10 Gigabit Ethernet, is a challenging task, especially when applications do not permit packet loss. In this environment, the use of multiprocessor and multicore systems, as well as the parallelization of applications, is aimed at improving the performance. However, the monitoring application may even experience performance penalties when adapted to multiprocessor architectures. After observing certain anomalies in a real traffic monitoring system that runs on a multiprocessor platform, this paper presents an analytical model for that type of systems. The model, which is based on generalized stochastic Petri nets, evaluates the efficiency of the traffic capturing and analysis system depending on the hardware/software platform features.

ABSTRACT
In NQaS, a kernel level network traffic sniffer under the name of Ksensor was created long ago. Ksensor has been using for long a kernel version which has become outdated with the pass of the years. In order to recover the relevance of the study of the sniffer and update with the latest trends in kernel efficiency, a project has been developed, in which Ksensor is adapted to get advantage of latest capture optimizations. Linux developers have created several ways to optimize the system throughput in high system load, and in the area of traffic capture, GRO and RPS mechanisms are the most important changes done.

ABSTRACT
The aim of this paper is to describe the design of a FPGA-based traffic generator able to inject synthetic traffic at gigabit or higher rate. The proposed architecture has been designed to add new features that existing generators do not offer. The generator tries to emulate real network traffic by injecting multiple flows that follow user desired statistical distributions. It offers a generic architecture that can support various protocols. The system also keeps an accurate timing of the injection of each frame. With those features, the proposed system aims to serve as a tool for testing traffic capture systems and other network resources at stress conditions, so research teams can measure and improve the performance of those systems.

ABSTRACT
Adviser is a user-space software which allows to capture and analyze traffic in high speed networks. This paper describes the integration of PF_RING library, kernel module and optional drivers into Adviser platform, to enhance the packet capturing. Adviser packet capturing is made through standard Linux Libpcap library and offers good performance and flexibility. PF_RING increases the packet capturing adding a new kernel module which speeds up the packet copying from kernel space to user-space. Therefore this integration will improve Adviser's traffic monitoring performance, reducing the CPU consumption in packet capturing

ABSTRACT
NQaS research group of the UPV/EHU focuses its activity on three main lines: the analysis of quality of service in data networks, the resource management in the distribution of multimedia content over NGN environments and the traffic analysis in high-speed networks using probes. This paper deals with the latter whose objective is to investigate the most efficient way to analyse the traffic in 1/10 Gbps or above networks with a traffic probe and to treat that data flow online. This paper shows the work that the group is developing, firstly, in the design of own software systems (Ksensor, Adviser) which are able to meet the computational needs that traffic analysis requires, secondly, in proposals for migration of certain components and logic to hardware systems based on FPGA in order to improve performance, and finally, in creating mathematical models to estimate the utilization of computational resources depending on the traffic analysis load.

ABSTRACT
Nowadays traffic monitoring is a must for manypurposes (IDS, antivirus, QoS monitoring, network problem detection, etc.) Deployment of high speed networks implies problems with these kind of systems to be able to cope with all the traffic in the network. Therefore, it would be interesting to know in advance whether our system will be able to do its task correctly, or it needs more processing power. This paper presents a simulator for network traffic capturing systems that use commodity hardware and general purpose operating systems. In order to establish the different elements of the simulator we carried out an in depth study of the network capturing subsystem in the Linux kernel. We identified the different stages of the travel of packets from wire to application, as well as the particular behavior of the system and computational cost for each one of them. With this information we have built up a model that simulates these different stages of a capturing system. This model allows us to estimate the performance a network application will be able to achieve, when packet losses will start and where they will appear.

ABSTRACT
The need to monitor and analyse network traffic grows with the deployment of new multimedia services over high speed networks. Predicting the overall capturing performance is crucial to know if the traffic monitoring system will be able to cope with all the traffic packets, or if it needs more processing power. In this paper, we present an analytical model based on a Markov chain to study the efficiency of the Linux network subsystem. Improving the capturing stage of Linux has been an extensively covered research topic in the past years. Although the majority of the proposals have been backed by experimental evaluations, there are few analytical models. We identify the softIRQ process as the main element in the Linux capturing stage and we have built a model that represents the different steps in the softIRQ and the computational cost for each one of them. The goodness of the model is checked by comparing analytical results with practical ones obtained from a real traffic monitoring system. Prior to obtaining the theoretical performance results, it is necessary to introduce some input parameters for the model. These initial necessary values are also extracted from experimental measurements, making use of an appropriate methodology. The results of all this process indicate us that the behaviour of the system performance depends on the network traffic rate and this has become our work in progress.

ABSTRACT
Global interoperability testing, as defined in ITU T Q.3909, leads to complex experiments involving many actors and variables to be controlled. The definition and deployment of these experimental scenarios together with the development of the testing methodology is a major challenge that is essential for studying the impact of new technologies and networks on future society. This contribution proposes a collaborative testing platform (LabQoS) that provides the capability to define and share experimental scenarios and to test results. The platform has been designed to determine, develop and reproduce extensive QoS experimental scenarios and to make them available to researchers or members of standardization organizations in a collaborative environment.

ABSTRACT
In traffic capturing and analysis systems, it is important to measure the performance in terms of throughput, packet loss, CPU availability, latency, interrupt frequency, etc. If these metrics are the result of theoretical assumptions, then it is necessary to validate those results by running appropriate testing. This paper presents a generic test framework composed of four elements (a manager, agents, daemons and formatters). With these four elements, every phase of the validation process is automated, from test configuration to result formatting. The architecture presented in this paper has been applied to validation tests of traffic monitoring systems devoted to high speed network traffic analysis. The performance tests have been made modifying different parameters such as packet injection rate, packet length, the number of processors on the probe, analysis load or probe’s configuration mode. In spite of having this infrastructure and configuration complexity, the deployment of this framework has led to a reduction in the time needed for the test phase and the number of errors due to mistakes.

ABSTRACT
This paper proposes the deployment of a network software platform for experimentation called LabQoS that will allow the scientific community to establish scientific experiments relating to measure the performance of applications and services on the Internet and other network environments. Previous experiences have already deployed measurement systems, but they don’t incorporate the concept of control of the scenario to enable the performing of experiments. This LabQoS capacity makes it an innovative platform unique in its approach. A module called Test Environment Builder has been designed in order to monitor the operating parameters, and to propose adaptation strategies to handle the scenario control variables. We define an experimental data model that identifies the entities to be considered in the management of the platform. Assessment mechanisms are proposed to study the dynamic sensitivity of the control variables with respect to the parameters. LabQoS is based on QoSMETER architecture that addresses technological aspects such as user management, deployment tools, data collection, reporting, security, etc.

ABSTRACT
This paper describes the research for a priority flow oriented design of the Ksensor architecture. Ksensor is a multiprocessor traffic capture and analysis system for high speed networks developed at kernel space. While the actual architecture permits the capture and analysis of data flows, there are several scenarios where it does not perform adequately to achieve this goal. For example, if a certain type of traffic is more valuable than others. Thus, this project pursues the design that allows Ksensor to provide data flow treatment to a larger extent. Allowing the new architecture to provide more reliability in data flow capture and processing.

ABSTRACT
Traffic monitoring is an increasingly important discipline for nowadays networking, as accounting, security and also Quality of Service (QoS) lay on it. Besides, traffic bandwidth has increased exponentially in the last few years, and high speed network monitoring is a challenging aim. Performance requirements are highly relevant for monitoring systems. In a previous work, our research group NQaS (Networking, Quality and Security) provided an architecture able to cope with high-speed traffic monitoring using commodity hardware. Its design was also intended to exploit the parallelism available. This paper shows the main features of this kernel-level monitoring system (ksensor) and presents an analytical model for a multiprocessor network traffic analysis system. The model which is based on Markov chains, evaluates the efficiency of the system. The goodness of the model will be checked by comparing analytical results with practical ones obtained in laboratory, using ksensor, which runs on a multiprocessor platform in the testing system.

ABSTRACT
This paper deals with the analysis of user perceived visual quality for mobile multimedia services. H.264/AVC is selected for low resolution video encoding, and 3G UMTS is considered for mobile data services. From subjective tests results, the combined impact of different service- and network-level parameters is inferred. As a result, different cross-layer adaptation alternatives are proposed to maximize the perceived quality level under different service conditions.

ABSTRACT
The evolution of current networks to Next Generation Networks (NGNs) constitutes arguably the most significant transformation in the Telecommunication sector in recent decades. Quality of Service (QoS) is one of the key aspects in this evolution. In the NGN environment, networks are designed to be multiservice, supporting a wide range of premium services. Each of these services may have different QoS requirements which should be established based on the overall end user's perception. In this emerging context, novel QoS policies are required to adapt the traditional QoS regulatory model to the new scenario. This paper presents an approach to identify key factors that contributes to the development of future Internet quality of service regulation. A case study on the application of our user-centric QoS model to the Internet QoS regulation in Spain is described. The results of the study demonstrate the need for adapting current regulatory frameworks in order to ensure competition, pluralism and diversity in the new network environment.

ABSTRACT
The rate of networks is bigger all the time. Because of this increase, computational ability of network resources and principal servers could not be adequate. In order to improve the performance of this equipment traffic generators are needed. These have to generate modelled traffic flows at high rates. To do this, the system must measure short lapses of time. This paper studies how the traffic generator over GNU/Linux sends a packet. It presents some temporary parameters to define the packet sending. Some experiments have been done in order to measure those parameters. Thanks to those measurements, this paper studies how this sending is, in fact. This helps taking decisions in the final design of the traffic generator.

ABSTRACT
In the design of traffic generators time measurement is very important. When a high rate is needed time lapses between packet sending are smaller. Because of this, the granularity of the system must be good. GNU/Linux has some tools that could be very useful to implement the measure of those time lapses. In order to choose the best solution, this paper studies the different tools that are provided by GNU/Linux. This study is aimed at the design of a kernel module that works as a traffic generator. In this paper is presented a solution that uses two kinds of tools, too. In this way, the performance of the generator is better.

ABSTRACT
With the increase of the rate in networks, computational ability of network resources and principal servers could be inadequate. In order to prove the performance of networks, network resources and servers there have to be traffic generators. These generate traffic flows with different characteristics. It is also necessary to have network monitoring systems to inspect and process traffic. Doing this in high speed segments in an efficient way is not easy. This paper proposes a design of an architecture to inject traffic in a synthetic way and to improve the performance in network traffic analysis. This architecture tries to improve other solutions’ performance using a general purpose architecture under Linux over a PC with a common network interface. The basis of this improvement is including the application in the kernel of the operating system.

ABSTRACT
Con el aumento de la velocidad en las redes de datos la capacidad computacional de la infraestructura de comunicaciones y de los servidores principales puede verse comprometida. Para poder probar el rendimiento de las redes, de los equipos de interconexión y de los servidores se hace necesario disponer de sistemas de inyección de tráfico, que permitan la generación de tráfico sintético con diferentes características. También es necesario disponer de sistemas de monitorización, que permitan estudiar las características del tráfico. Hacer esto en segmentos de alta capacidad de una forma eficaz no es un asunto trivial. Este artículo propone el diseño de una arquitectura de inyección y monitorización de tráfico sintético que pretende mejorar los rendimientos de las soluciones disponibles utilizando una arquitectura de propósito general como es un sistema Linux sobre un PC con una interfaz de red común. El fundamento en la mejora de los rendimientos se basa principalmente en la introducción de la lógica de inyección y monitorización en el núcleo del sistema operativo.

ABSTRACT
Quality of service has become one of the most important factors among Internet service providers. The implementation of appropriate QoS policies is essential in order to maintain customer loyalty and fulfill regulators' requirements. ITU-T recommendation E.802 provides a framework for the identification of QoS criteria relevant to users and ISPs. This Recommendation also provides guidelines to derive measurable QoS parameters from identified criteria. This article presents a QoS management model and implementation methodology for ISPs. We ground our investigation on the E.802 framework, which ISPs may face when implementing ITU-T Recommendation G.1000. The proposed methodology is meaningful for users, vendors, and network operators. Furthermore, its conformance with the ITU-T standard makes it suitable and deployment-ready for both regulators and providers.

ABSTRACT
This paper presents an implementation of the BGP/MPLS IP VPN functionalities for GNU/Linux. First, we briefly review the operation mode described in the IETF RFC 4364 and show the characteristics that are supported by this implementation. Afterwards, we provide some implementation details of the forwarding plane for the kernel 2.6.18.1. This implementation includes the integration of the MPLS- and VRF-for-Linux projects. Finally, we present some example scenarios to validate our implementation in different cases, and show the corresponding commands for the ingress and egress PE routers. This work establishes a first approach for testing BGP/MPLS IP VPN technology in GNU/Linux testbeds and supports the basic functionalities for a future implementation of the signaling plane.

ABSTRACT
Traffic monitoring is an increasingly important discipline for nowadays networking, as Accounting, Security and Traffic Engineering lay on it. Besides, traffic bandwidth has increased exponentially in the last few years, and high-speed network monitoring has become a challenging task. Performance requirements are highly relevant for passive QoS monitoring systems. A low-level study of the capturing and processing stages on a traffic analysis system (TAS) has shown room for improvement. We provide an architecture able to cope with high-speed traffic monitoring using commodity hardware. Our system is intended to exploit the parallelism available in up-to-date workstations, which also introduces constraints for multithreaded QoS analysis. This paper presents a kernel-level framework (ksensor) that, keeping the previous requirements, removes some issues from user-level processing and effectively integrates QoS algorithms, improving the overall performance.

ABSTRACT
Traffic monitoring is an increasingly important discipline for nowadays networking, as Accounting, Security and also Quality of Service (QoS) lay on it. Besides, traffic bandwidth has increased exponentially in the last few years, and high-speed network monitoring is a challenging aim. Performance requirements are highly relevant for monitoring systems. A low-level study of the capturing stages on a traffic analysis system (TAS) has shown room for improvement. We provide an architecture able to cope with high-speed traffic monitoring using commodity hardware. Our design is also intended to exploit the parallelism available in up-to-date workstations. This paper presents a kernel-level monitoring system (ksensor) that, keeping the previous requirements, removes some issues from user-level processing, improving the overall performance.

ABSTRACT
Traffic monitoring is an increasingly important discipline for nowadays networking, as Accounting, Security and also Quality of Service (QoS) lay on it. Besides, traffic bandwidth has increased exponentially in the last few years, and high-speed network monitoring is a challenging aim. Performance requierements are highly relevant for monitoring systems. A low-level study of the capturing stages on a traffic analysis system has shown room for improvement. We provide an architecture able to cope with high-speed traffic monitoring using commodity hardware. Our design is also intended to exploit the parallelism available in up-to-date workstations. This paper presents a kernel-level monitoring system (KSensor) that, keeping the previous requirements, removes some issues in user level monitoring system, improving the overall performance.

ABSTRACT
Deployment of quality-of-service (QoS) policies is becoming one of the biggest challenges for today's Internet Service Providers (ISPs). Nowadays, QoS does not only address specific technical standard metrics; it must be concern about other aspects such as user's final perception or regulations mandatory compliments instead. Although some efforts are being made on studying and analysing this new QoS scope, there are not still many advances on defining methodologies to deploy it on real network sceneries. UIT-T Rec. G-1000 makes an approachon this issue and provides a meaningful framework to users, service providers and regulators. Nevertheless, UIT-T G.1000 does not go an step further and remains at the 'theorical stage'. Our research group NQaS (Networking Quality and Security) is carrying out different initiatives focus on solving this new QoS dimension. This paper presents some of the on-going research areas of NQaS on the way to find an appropiate methodology to apply a global QoS policy in an ISP on the basis of the UIT-T G.1000 framework.

ABSTRACT
Traditional QoS related studies handle technical KPI (key performance indicators) which are supposed to measure the quality of telecommunication services. However, while trying to select an ISP, most users are not able to choice the most suitable one for their needs. This papers presents the application of a perceived QoS based model as a tool for helping users in this kind of decisions. Our model represents the impact of each one of the objective performance indicators on the perception of quality for a particular user profile. Once the model is built common users will be able to identify the best combination of performance indicators for their pattern of use of the different Internet services. We have used velocimetro.org, a website that provides measurement services for common users, in order to feed the model with real world values and compare 4 different Spanish ISPs.

ABSTRACT
Data network Quality of Service (QoS) measurement and evaluation is a challenge being deeply studied nowadays. Measurement techniques and methodologies are broad available, but they are not connected among them, this is, the evaluation is based on raw parameters. In this paper we present a proposal of an integrating architecture which can evaluate user's perceived QoS, merging results obtained by different measurement tools in order to acquire a better knowledge of the communication link than using a single parameter. Extra effort is made to develop a set of easy to use and understand measurement tools.

ABSTRACT
In last years there have been some governmental initiatives aimed at the regulation of quality of service evaluation in telecommunications services. However this has proven to be a complex task especially for Internet services, where it is difficult to objectively assess the quality of a service and to identify whether one or more of the provider agents are responsible of final dissatisfaction of users. This paper affords the cited problem and intends to provide a methodology to asses the quality of service as perceived by end users. The aims of the proposed model are twofold: the evaluation of perceived quality of service (PQoS) based on subjective and objective measurements and the identification of responsibilities of the different agents involved in a service provision.

ABSTRACT
This paper presents a comprehensive model intended to analyze quality of service in telecommunications services and its causes. Although many works have been published in this area, both from a technical viewpoint as well as taking into consideration subjective concerns, they have not resulted in a unique methodology to assess the experienced quality. While most of the studies consider the quality of service only from a technical and end-to-end point of view, we try to analyze quality of service as a general gauge of final users' satisfaction. The proposed model allows us to estimate the quality experienced by end users, while offering detailed results regarding the responsibility of the different agents involved in the service provision. Once we overview the most significant elements of the model, an in-depth analytical study is detailed. Finally, we illustrate a practical study for web browsing service in order to validate the theoretical model.

ABSTRACT
The importance of security issues in network environments has increased greatly lately. Intrusion Detection Systems play an important role in network security environments. Nevertheless, nowadays, data network speed is so high that performing intrusion detection tasks becomes challenging. This paper presents a software architecture that intends to exploit the parallelism available on up-to-date and future workstations to apply intrusion detection rules in high speed networks. To achieve this, a shared memory multiprocessor system has been developed. The system includes a powerful rule language that adds big flexibility to the system.

ABSTRACT
This paper presents a comprehensive model intended to analyse quality of service in telecommunications services. Many works have been published in this area, both from a technical viewpoint as well as taking into consideration subjective concerns. However, these works have not resulted in a unique methodology to assess the experienced quality. While most of the studies consider the quality of service from biased perspectives, we try to analyse quality of service as a general gauge of final users’ satisfaction. The proposed model allows us to estimate the quality experienced by end users, while offering detailed analysis regarding the different agents involved in the service provision. Once we overview the most significant elements of the model, an in-depth analytical study is detailed. Finally, we illustrate a practical study for HTTP service in order to validate the theoretical model.

ABSTRACT
Analysis of network traffic has become a really important task for many fields, from IDS to QoS evaluation. The great increase in the speed of networks, much faster than processor's performance increase, is making difficult to handle the processing of all network packets. One way to solve this problem is to move the processing to the hardware elements. This is a very expensive solution and, in some cases, improving the performance of the capturing software may be enough. Although current general purpose operating systems have been improving the performance of network processing, there is still place for improvement. In this paper we present in detail the way followed by a packet through the operating system until it is processed at user level. Some empirical measurements has been made along the packet journey in order to find the bottlenecks of the capturing process as well as discussing some ways to further increase the performance of the capturing process.

ABSTRACT
Simulation models have been developed in order to foresee characteristics of networks, systems or protocols when doing tests in laboratories are very expensive or even impossible. This paper presents a simulation model of a multiprocessor network traffic analysis system. The model, which is based on closed networks of queues, evaluates the efficiency of the system depending on the hardware/software platform features. Therefore, this model is able to estimate performance early in the design and development stages simulating a multiprocessor architecture in charge of analysing network traffic. The goodness of the model will be checked by comparing analytical results with practical ones obtained in laboratory using a traffic analysis system that runs in a multiprocessor platform.

ABSTRACT
This paper presents a comprehensive model intended to analyse general quality in telecommunications services centred in end users’ perceived quality (PQoS). The proposed model allows us to estimate the quality experienced by end users, while offering detailed analyses regarding the responsibility of the different agents involved in the service provision. We overview the structure of the model, that resembles QFD general quality model. Then we describe a practical study where the variation of the global satisfaction of users is estimated. This approximation is carried out by means of the evaluation of a set of telecommunications services with diverse nature, such as web browsing, VoIP and even technical support. Finally, we use the multiple linear regression method for assessing different providers' contribution to the PQoS in every considered network state.

ABSTRACT
Teaching is greatly improved by personal orientation for pupils. The perception of learning problems have differences for each one. We show, in this paper, how technical aids can serve to give personal orientation to pupils to achieve a good comprehension of the professional and technical subjects. Of course there are some general aspects that are explained to every one in the same way. And pupils can learn many of these general aspects by himself or herself, because the information can be found on the internet, or in detailed documents given by the teacher. Nowadays technology can also serve, but it can't replace, personal orientation in professional tasks to each people.

ABSTRACT
Data communication is a widespread service in our society and the need for controlling the information interchange increases. Intending to solve this need, different kind of data capture systems (sensors or probes) have been implemented. The aim of this paper is to present a new architecture that analyses data providing essential information like complex quality of service statistics, intrusion detection, accounting... Nowadays, performance requirements limit the functionalities of sensors. Therefore, we have developed a high performance multiprocessor architecture which can process passively and online the captured packets in different ways. This improvement allows to apply complex QoS algorithms whose implementation is quite difficult if the number of connections to follow is high.

ABSTRACT
This paper analyses several issues about security and QoS in corporate networks based on BGP/MPLS IP VPN technology. First, we discuss some security requirements and constraints specified for ‘conventional’ BGP/MPLS IP VPNs, where the provider’s transport infrastructure supports MPLS. Likewise, we describe different alternative mechanisms suitable to provide QoS guarantees in this kind of networks. Afterwards, the paper focuses on a transition scenario, where some of the corporate sites may be attached to an IP backbone with no MPLS support. In order to preserve the basic VPN architecture some alternative tunneling approaches are defined. We study some critical security requirements in this scenario and analyse the potential impact of its implementation over the QoS characteristics. We present a testbed based on Linux boxes and some general implementation issues, and finally some empirical results are shown.

ABSTRACT
Actualmente, un aspecto clave tanto para usuarios como operadores de redes de comunicaciones es la calidad de servicio prestada en las redes de datos y servicios asociados. De hecho, según la legislación actual, los proveedores que operen en el mercado europeo pueden estar sujetos a la obligación de publicar información sobre la calidad que proporcionan. En el caso español, actualmente no existe una reglamentación al respecto, por lo que se hace necesario estudiar el conjunto de parámetros que podrían ser susceptibles de publicación por parte de estos proveedores, y los mecanismos de medida adecuados para ello.

ABSTRACT
This paper presents an overview of the research activities accomplished in the 'Telematics Engineering Group' (UPV/EHU) in the area of perceived QoS. We go over the achieved works until the current day and we present as well the scheduled research tasks regarding the measurement of QoS from an end user perspective. The proposed theoretical model is intended to analyse the performance experimented in every agent involved in the provision o f Internet services. Furthermore, we state several in-progress enhancements to the model and introduce an approach to empirically validate the model.

ABSTRACT
Esta ponencia describe una metodología para la evaluación de los servicios de telecomunicación desde la perspectiva de los usuarios. La metodología se basa en una clasificación de los servicios y sus componentes que es comprensible para los usuarios y en la identificación de los distintos factores de la calidad de servicio que afectan y determinan la calidad de servicio percibida por los usuarios. Basándose en estas clasificaciones, se estudian los componentes y relaciones de un sistema que permita evaluar la QoS de las ofertas de servicios de distintos proveedores. Dicha evaluación se basa en un modelo que establece la correspondencia entre la calidad percibida por el usuario y las funciones y responsabilidades de los agentes que intervienen en la prestación de un servicio. Por último, se presentan algunos de los resultados obtenidos a partir de la aplicación de la metodología y la línea de trabajos futuros.

ABSTRACT
This paper offers an approach to the definition of access speed measurements. An ever growing increase of Internet Service Providers (ISP) and different types of technologies in the Internet access, makes it difficult for users to decide which is the best or most suitable connection to satisfy their needs. From these considerations, the possibility of the Internet users to obtain a real and neutral measurement of the service of their Internet access may help them to decide if it is covering their demands or, on the contrary, the provider is not complying with the terms of the contract. In order to perform this measurement, an Internet speed test through web interface has been defined, as well as the way to obtain a measure which can comply with the objective of giving users a proper idea of how their Internet access is working. This project is included in the Quality of Service (QoS) investigation area in our investigation group.

ABSTRACT
This document describes several design proposals to enhance network sensor performance on multiprocessor architectures. Our main contributions are related to the design of an autonomous sensor and to the idea of performing some parallelization of the analysis. These proposals can be implemented in network sensors such as intrusion detection systems, network antivirus appliances, QoS monitors and any other device based on network traffic analysing. Taking a certain model of traffic analysis as our starting point, we look deeply into some design proposals to address the difficulties involved in the parallelization. In this work, we propose a series of resources that can help us to solve these difficulties. Later, we study the prototypes developed in order to test different design alternatives and, finally, present selected case studies. We finish by quantitatively analysing the results to validate our design proposals.

ABSTRACT
This research study tries to demonstrate the direct relationship between ICT introduction in SMEs and the improvement of the innovation capability of the firm, and provides a tool for the selection of the technology which apart fr om improving productivity better enhances innovation culture. Based on a study of fifty selected innovative SMEs, the study identifies the parameters which control the system dynamics of the firm.

ABSTRACT
The communication is very important in our society. As the need of controling the information interchange increases, data capture system has been implemented. Analysing data can provide essential information like intrusion detection, quality of service statistics, accounting… These scopes are differents so a unified language facilitates to compose rules and to interchange them with other systems. XML (Extensible Markup Language) tags are defined to create a large number of differents and complex rules. Then it was developed a parser which load in memory these rules.

ABSTRACT
During the last years the use of computers and Telematic networks has permited to surpass the barriers of space and time to facilitate interactive and personalised contact among the members of University community. The concept of a Virtual Campus has been introduced, offering several advantages over the traditional education: for instance, an easier communication between teachers and students and a solution for time and space problems. In this context the development of the system described in this document is aimed at helping users to smartly schedule projects, activities and tasks for an optimum use of work and effort, in an educational enviroment and in a simple and flexible way.

ABSTRACT
This paper presents velocimetro.org, the service developed by the Engineering Faculty of Bilbao to provide access speed measurements in Internet. The explosion of Internet Service Providers (ISP) and different types of technologies in Internet access, makes it difficult for Internet users to decide about the best or more acquaint access to cope with their needs. Velocimetro.org offers the possibility to obtain a neutral measurement of the quality of service (QoS) of the access to Internet. In this way, users can evaluate and decide if their ISP is covering their demands or, on the contrary, is not complying with the terms of the contract. From this point of view of an ISP, velocimetro.org allows to make comparisons of their service against their competitors.

ABSTRACT
This paper presents velocimetro.org, the service developed by the Engineering Faculty of Bilbao to provide access speed measurements in Internet. The explosion of Internet Service Providers (ISP) and different types of technologies in Internet access, makes it difficult for Internet users to decide about the best or more acquaint access to cope with their needs. Velocimetro.org offers the possibility to obtain a neutral measurement of the quality of service (QoS) of the access to Internet. In this way, users can evaluate and decide if their ISP is covering their demands or, on the contrary, is not complying with the terms of the contract. From the point of view of an ISP, velocimetro.org allows to make comparisons of their service against their competitors.

ABSTRACT
During the 90's the exponential growth of the number of Internet users led to the birth of many ISPs and data operators. Nowadays, after the technological bubble, only some of them survive. Since prices have reached the lowest limit, some kind of service quality differentiation between competitors is a must. Unfortunately, QoS measuring methods don’t always agree with users' expectations. Moreover, many times data operators don't know how to improve the quality that users perceive. Any investment on infrastructures seems to result on an improvement, but there are no guarantees. This article describes the effort of a group of Spanish Universities towards the definition of a method to set up and measure the relationships between users' satisfaction and network parameters. The model developed would allow both ISPs and legislators to control the degree of users' satisfaction, as well as how any change in network parameters results on a variation of their perceptions.

ABSTRACT
This paper presents an analytical model based in queueing theory which allows to represent the behavior of an intrusion detection system . Besides, an iterative calculation method based in the mean value method has been developed to obtain the most significant parameters of the system, for example throughput. In the future, the main objective of this work is to extend the analytical model of this intrusion detection system to any generic multiprocessor architecture.