515 research outputs found
Online Estimation of Battery Lifetime for Wireless Sensors Network
Battery is a major hardware component of wireless sensor networks. Most of
them have no power supply and are generally deployed for a long time.
Researches have been done on battery physical model and their adaptation for
sensors. We present an implementation on a real sensor operating system and how
architectural constraints have been assumed. Experiments have been made in
order to test the impact of some parameter, as the application throughput, on
the battery lifetime
SecSip: A Stateful Firewall for SIP-based Networks
SIP-based networks are becoming the de-facto standard for voice, video and
instant messaging services. Being exposed to many threats while playing an
major role in the operation of essential services, the need for dedicated
security management approaches is rapidly increasing. In this paper we present
an original security management approach based on a specific vulnerability
aware SIP stateful firewall. Through known attack descriptions, we illustrate
the power of the configuration language of the firewall which uses the
capability to specify stateful objects that track data from multiple SIP
elements within their lifetime. We demonstrate through measurements on a real
implementation of the firewall its efficiency and performance
Performance of Network and Service Monitoring Frameworks
The efficiency and the performance of anagement systems is becoming a hot
research topic within the networks and services management community. This
concern is due to the new challenges of large scale managed systems, where the
management plane is integrated within the functional plane and where management
activities have to carry accurate and up-to-date information. We defined a set
of primary and secondary metrics to measure the performance of a management
approach. Secondary metrics are derived from the primary ones and quantifies
mainly the efficiency, the scalability and the impact of management activities.
To validate our proposals, we have designed and developed a benchmarking
platform dedicated to the measurement of the performance of a JMX manager-agent
based management system. The second part of our work deals with the collection
of measurement data sets from our JMX benchmarking platform. We mainly studied
the effect of both load and the number of agents on the scalability, the impact
of management activities on the user perceived performance of a managed server
and the delays of JMX operations when carrying variables values. Our findings
show that most of these delays follow a Weibull statistical distribution. We
used this statistical model to study the behavior of a monitoring algorithm
proposed in the literature, under heavy tail delays distribution. In this case,
the view of the managed system on the manager side becomes noisy and out of
date
Intrusion detection mechanisms for VoIP applications
VoIP applications are emerging today as an important component in business
and communication industry. In this paper, we address the intrusion detection
and prevention in VoIP networks and describe how a conceptual solution based on
the Bayes inference approach can be used to reinforce the existent security
mechanisms. Our approach is based on network monitoring and analyzing of the
VoIP-specific traffic. We give a detailed example on attack detection using the
SIP signaling protocol
Internet Services:Management Beyond the Element - A Report on DSOM'2001
The report from Annual International Workshop on 'Distributed Systems: Operations and Management' is presented. The theme of workshop was 'Internet services: management beyond the element' which reflected the shift within current Internet from managing isolated network elements to managing integrated end-to-end services. The topics discussed at workshop included service provisioning, application management, customer care, QoS management, policy languages and IP applications. The tutorial on 'JMX in Java & Management Environments' described status of JMX and possible ways to integrate JMX in JAVA environment
jYang : A YANG parser in java
The NETCONF configuration protocol of the IETF Network Work- ing Group
provides mechanisms to manipulate the configuration of network devices. YANG is
the language currently under consideration within the IETF to specify the data
models to be used in NETCONF . This report describes the design and development
of a syntax and semantics parser for YANG in java
The GDMO and GRM Modules Semantic Checker of the MODERES Java Toolkit
MODERES Java is an environment for the development of management information models. In its first release, it provides tools for the manipulation of information models specified using GDMO and GRM. This report presents one component of the environment, i.e. the GDMO/GRM modules semantic checker. The report contains a detailled description of performed verifications as well as a complete implementation and usage guide for the semantic checker as implemented within the environment
The Managed Object Format Specification Parser of the MODERES Java Toolkit
MODERES Java is an environment for the development of management information models. This environment aims at providing a set of tools for the manipulation of information models coming from different management frameworks. These tools include parsers, mapping and back-end facilities as well as navigation features within specifications. This report presents one component of the environment, i.e. the MOF (Managed Object Format) syntax parser. MOF is the notation defined within the WBEM (Web-Based Enterprise Management) framework as part of the Common Information Model (CIM). This report contains a detailed description of the model as well as a complete implementation and usage guide for the syntax parser implemented within the MODERES environment
MODERES Java: Architecture and Core Packages
MODERES is an environment for the development of management information models. The initial release of the environment was developped in C++ and provided tools for the manipulation of information models specified using GDMO and GRM. This report presents the architecture and core packages of the MODERES Java environement. This environement is completely developped in Java and contains the initial MODERES tools as well as a new architecture for the use of the MODERES suite in an enterprise network
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