83 research outputs found

    Simulator Networking Handbook: Distributed Interactive Simulation Testbed

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    Report is an attempt to collect and organize a large body of knowledge regarding the design and development of simulation networks, particularly distributed interactive simulation

    Performance Evaluation of 802.11P Protocol for Emergency Application

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    Vehicle manufacturers have adopted this technology to assist the drivers drive their car like alarming the driver if he is close to some object while driving or safely parking the car to name a few. However, the main difference in an Adhoc network that involves a vehicle is the mobility factor. A vehicle is constantly in motion varying its location with time which means constant change in its position and surroundings. With the increase in the number of vehicles running in the road the probability of road accidents increases. The aim of the vehicle manufacturers and government agencies is to provide safe driving experience to save lives and assets. Sensor nodes has gone a long way from being just a technology to being an integral part of our life and its no surprise that vehicle manufacturers have incorporated them to create VANET that has a dedicated 802.11p protocol. In this essay based on my thesis, we show that 802.11p protocol is performing as per expected and all the nodes receive packet as should be the case. Simulation is done using an open source, discrete event driven tool called NS2 where a node generates and transmits a packet which is passed on by the other nodes. The simulation is performed considering node distance, retrans-mission attempt, and contention window. The results were analysed on the basis of con-figuration parameter mentioned. We evaluate the performance of 802.11p protocol by studying the output based on the node distance, retransmission attempt, and contention window. The graph generated from the simulation showed that all nodes receives a mes-sage which shows that 802.11p protocol is in fact working as intended. The most surprising result was that all of the nodes received the packet generated by the first node

    IP Network Management Platforms Before the Web

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    In this paper, we analyze the characteristics and shortcomings of IP network management platforms before the arrival of Web technologies. In the first part, we give a brief history of IP network management, and summarize the limitations of traditional (i.e., pre-Web and SNMP-based) management platforms. We recall the initial objectives of open network management. We then explain how the early vision of generic management was changed by the industry`s natural inclination for market segmentation, and how the market of IP networks evolved from generic to vendor-specific equipment, management GUIs and MIBs. In the second part, we propose a simple model of traditional IP network management platforms, against which new Web-based management solutions can be compared. We introduce the three core functions of such platforms (network monitoring, data collection, and event handling), distinguish regular management from ad hoc management, and explain how SNMP`s polling model maps onto these functions

    New dynamic bandwidth allocation algorithm analysis: DDSPON for ethernet passive optical networks

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    This project aims to present the state of the art in Dynamic Bandwidth Allocation (DBA) solutions, as well as the study and evaluation of one proposal of DBA algorithm: the Distributed Dynamic Scheduling for EPON (DDSPON), which is the UPC contribution to the research in scheduling algorithms for EPON

    Design of a New High Bandwidth Network for Agricultural Machines

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    Ethernet is by now the most adopted bus for fast digital communications in many environments, from household entertainment to PLC robotics in industrial assembly lines. Even in automotive industry, the interest in this technology is increasingly growing, pushed forward by research and by the need of high throughput that high dynamics distributed control demands. Although 100base-TX physical layer (PHY) does not seem to meet EMC requirements for vehicular and heavy-duty environments, OPEN Alliance BroadR Reach (soon becoming IEEE standard as IEEE 802.3bw) technology is the most promising and already adopted Ethernet-compatible PHY, reaching 100Mbps over an unshielded twisted pair. An agricultural machine is usually a system including tractor and one or more implements attached to it, to the back or to the front. Nowadays, a specific CAN-based distributed control network support treatments and applications, namely ISOBUS, defined by ISO 11783. This work deals with architectural and technological aspects of advanced Ethernet networks in order to provide a high-throughput deterministic network for in-vehicle distributed control for agricultural machinery. Two main paths of investigation will be presented: one concerning the prioritization of standard Ethernet taking advantage of standard ways of prioritization in well-established technologies; the other changing the channel access method of Ethernet using an industrial fieldbus, chosen after careful investigation. The prioritization of standard Ethernet is performed at two, non-mutual exclusive layers of the ISO OSI stack: one at L3, using the diffserv (former TOS) Ip field; one at L2, using the priorities defined in IEEE 802.1p, used in IEEE 802.1q (VLAN). These choices have several implications in the specific field of application of the agricultural machines. The change of the access method, instead, focused on the adoption of a specific fieldbus, in order to grant deterministic access to the medium and reliability of communications for safety-relevant applications. After a survey, that will be reported, the Powerlink fieldbus was chosen and some modifications will be discussed in order to suit the scope of the research

    Analyzing audit trails in a distributed and hybrid intrusion detection platform

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    Efforts have been made over the last decades in order to design and perfect Intrusion Detection Systems (IDS). In addition to the widespread use of Intrusion Prevention Systems (IPS) as perimeter defense devices in systems and networks, various IDS solutions are used together as elements of holistic approaches to cyber security incident detection and prevention, including Network-Intrusion Detection Systems (NIDS) and Host-Intrusion Detection Systems (HIDS). Nevertheless, specific IDS and IPS technology face several effectiveness challenges to respond to the increasing scale and complexity of information systems and sophistication of attacks. The use of isolated IDS components, focused on one-dimensional approaches, strongly limits a common analysis based on evidence correlation. Today, most organizations’ cyber-security operations centers still rely on conventional SIEM (Security Information and Event Management) technology. However, SIEM platforms also have significant drawbacks in dealing with heterogeneous and specialized security event-sources, lacking the support for flexible and uniform multi-level analysis of security audit-trails involving distributed and heterogeneous systems. In this thesis, we propose an auditing solution that leverages on different intrusion detection components and synergistically combines them in a Distributed and Hybrid IDS (DHIDS) platform, taking advantage of their benefits while overcoming the effectiveness drawbacks of each one. In this approach, security events are detected by multiple probes forming a pervasive, heterogeneous and distributed monitoring environment spread over the network, integrating NIDS, HIDS and specialized Honeypot probing systems. Events from those heterogeneous sources are converted to a canonical representation format, and then conveyed through a Publish-Subscribe middleware to a dedicated logging and auditing system, built on top of an elastic and scalable document-oriented storage system. The aggregated events can then be queried and matched against suspicious attack signature patterns, by means of a proposed declarative query-language that provides event-correlation semantics

    Trends in Energy Management Technology: BCS Integration Technologies - Open Communications Networking

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