Download or read book Towards Wireless Bare Machines a Study of Three Aspects of 802 11 Wireless Networks written by William R. Agosto-Padilla and published by . This book was released on 2016 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bare machines applications run without the support of any operating system (OS) or other intermediary software. Since only the application code runs on the bare machine, exploits that target an underlying OS or kernel cannot compromise such applications. Bare machine applications are also more efficient than applications that require a conventional OS or kernel due to elimination of the associated overhead. Existing bare machine applications include Web servers, split servers, mail servers, SIP servers and VoIP clients. A bare machine connects to a network via an Ethernet connection. This research lays the groundwork for enabling bare machines to connect to 802.11 wireless networks in the future. We first obtain baseline performance measurements for mobile devices that connect to an 802.11n network. Specifically, we conduct experiments to measure the throughput and delay of mobile devices in a 2.4 GHz 802.11n LAN under different levels of congestion in the wireline network, where the path from the mobile devices to a Web server traverses several routers. The results indicate that there is high variability in the performance of mobile devices even in an interference-controlled environment with no congestion in the wireline network; and that higher performance loss does not always correspond to a higher level of congestion. Packet analysis reveals that the performance variability and performance reduction are primarily due to the use of RTS-CTS and the cost of retransmitting packets on the wireless link. This suggests that mobile devices in an 802.11 network should be conservative in their use of RTS-CTS when congestion in the wireline network is likely or detected. Next, we study a Broadcom Linux 802.11n wireless device driver. Our analysis provides a deeper insight into driver functions and their OS dependencies. We analyze the driver module by examining its interaction with other modules, providing details of its key elements and code sizes, and comparing code sizes with its counterpart Windows driver. We also identify some design issues that will be useful for developing device drivers that are independent of any operating system, kernel, or embedded system. The study shows that transforming existing OS drivers to run on a bare machine requires knowledge of the inner workings of the Linux kernel and its interactions with the device driver. Finally, we study CCM mode, which is the basis for the 802.11i security standard CCMP. We first study popular Linux and Windows CCM mode implementations to understand their OS dependencies. We then implement CCM mode with no OS dependencies so that it runs on a bare machine. The bare machine CCM mode implementation derives from the original specification of CCM mode, and is not a transformation of either the Linux or the Windows versions. We compare the performance of the bare machine and Linux CCM implementations by sending UDP messages and measuring internal timings for the authenticated encryption/decryption operations. We also measure network delays. The results show that the bare machine implementation performs better than the Linux implementation in some cases, but not in others.
Download or read book 802 11 Wireless Networks written by Alan Holt and published by Springer Science & Business Media. This book was released on 2010-06-25 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique and practical text introduces the principles of WLANs based upon the IEEE 802.11 standards, demonstrating how to configure equipment in order to implement various network solutions. The text is supported by examples and detailed instructions.
Download or read book 802 11 Wireless Networks written by Matthew Gast and published by "O'Reilly Media, Inc.". This book was released on 2005-04-25 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: As we all know by now, wireless networks offer many advantages over fixed (or wired) networks. Foremost on that list is mobility, since going wireless frees you from the tether of an Ethernet cable at a desk. But that's just the tip of the cable-free iceberg. Wireless networks are also more flexible, faster and easier for you to use, and more affordable to deploy and maintain.The de facto standard for wireless networking is the 802.11 protocol, which includes Wi-Fi (the wireless standard known as 802.11b) and its faster cousin, 802.11g. With easy-to-install 802.11 network hardware available everywhere you turn, the choice seems simple, and many people dive into wireless computing with less thought and planning than they'd give to a wired network. But it's wise to be familiar with both the capabilities and risks associated with the 802.11 protocols. And 802.11 Wireless Networks: The Definitive Guide, 2nd Edition is the perfect place to start.This updated edition covers everything you'll ever need to know about wireless technology. Designed with the system administrator or serious home user in mind, it's a no-nonsense guide for setting up 802.11 on Windows and Linux. Among the wide range of topics covered are discussions on: deployment considerations network monitoring and performance tuning wireless security issues how to use and select access points network monitoring essentials wireless card configuration security issues unique to wireless networks With wireless technology, the advantages to its users are indeed plentiful. Companies no longer have to deal with the hassle and expense of wiring buildings, and households with several computers can avoid fights over who's online. And now, with 802.11 Wireless Networks: The Definitive Guide, 2nd Edition, you can integrate wireless technology into your current infrastructure with the utmost confidence.
Download or read book Designing and Deploying 802 11 Wireless Networks written by Jim Geier and published by Cisco Press. This book was released on 2015-04-29 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designing and Deploying 802.11 Wireless Networks Second Edition A Practical Guide to Implementing 802.11n and 802.11ac Wireless Networks For Enterprise-Based Applications Plan, deploy, and operate high-performance 802.11ac and 802.11n wireless networks The new 802.11ac standard enables WLANs to deliver significantly higher performance. Network equipment manufacturers have refocused on 802.11ac- and 802.11n-compliant solutions, rapidly moving older versions of 802.11 toward “legacy” status. Now, there’s a complete guide to planning, designing, installing, testing, and supporting 802.11ac and 802.11n wireless networks in any environment, for virtually any application. Jim Geier offers practical methods, tips, and recommendations that draw on his decades of experience deploying wireless solutions and shaping wireless standards. He carefully introduces 802.11ac’s fundamentally different design, site survey, implementation, and network configuration techniques, helping you maximize performance and avoid pitfalls. Geier organizes each phase of WLAN deployment into clearly defined steps, making the entire planning and deployment process easy to understand and execute. He illuminates key concepts and methods through realistic case studies based on current Cisco products, while offering tips and techniques you can use with any vendor’s equipment. To build your skills with key tasks, you’ll find several hands-on exercises relying on free or inexpensive tools. Whether you’re deploying an entirely new wireless network or migrating from older equipment, this guide contains all the expert knowledge you’ll need to succeed. Jim Geier has 30 years of experience planning, designing, analyzing and implementing communications, wireless, and mobile systems. Geier is founder and Principal Consultant of Wireless-Nets, Ltd., providing wireless analysis and design services to product manufacturers. He is also president, CEO, and co-founder of Health Grade Networks, providing wireless network solutions to hospitals, airports, and manufacturing facilities. His books include the first edition of Designing and Deploying 802.11n Wireless Networks (Cisco Press); as well as Implementing 802.1X Security Solutions and Wireless Networking Handbook. Geier has been active in the IEEE 802.11 Working Group and Wi-Fi Alliance; has chaired the IEEE Computer Society (Dayton Section) and various conferences; and served as expert witness in patent litigation related to wireless and cellular technologies. Review key 802.11 concepts, applications, markets, and technologies Compare ad hoc, mesh, and infrastructure WLANs and their components Consider the impact of radio signal interference, security vulnerabilities, multipath propagation, roaming, and battery limitations Thoroughly understand today’s 802.11 standards in the context of actual network deployment and support Plan your deployment: scoping, staffing, schedules, budgets, risks, feasibility analysis, and requirements Architect access networks and distribut
Download or read book Designing and Deploying 802 11n Wireless Networks written by Jim Geier and published by Pearson Education. This book was released on 2010-06-01 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gain a practical understanding of the underlying concepts of the 802.11n standard and the methodologies for completing a successful wireless network installation Practical, start-to-finish guidance for successful deployment of 802.11n wireless LANs With the ratification of the 802.11n wireless LAN standard, thousands of companies are moving rapidly toward implementation. However, 802.11n is very different from legacy 802.11a, 802.11b, and 802.11g wireless standards, and successful deployment requires new knowledge and techniques. In this book, leading wireless expert Jim Geier systematically presents all the information and guidance that network architects, engineers, administrators, and managers need to maximize the performance and business value of new 802.11n networks. Drawing on extensive experience with real-world 802.11n deployments, Geier guides you through the entire project lifecycle: planning, design, installation, testing, monitoring, and support. Each phase of wireless LAN deployment is organized into clearly defined steps, and multiple case studies and hands-on exercises show how to apply each technique. You’ll find practical guidance for deploying in enterprises without existing wireless infrastructure, as well as migrating from legacy 802.11a, 802.11b, or 802.11g networks. For convenient reference, Geier also provides an extensive, up-to-date wireless networking glossary. Understanding 802.11n MAC, physical layer, and related standards Designing 802.11n wireless networks for diverse scenarios: considering architecture, range, performance, roaming, and RF issues Migrating from 802.11a, 802.11b, and 802.11g wireless networks Choosing the right tools and equipment, and using them effectively Planning effectively: scoping projects; creating work breakdown structures; organizing teams, schedules, and budgets; defining requirements, and more Securing WLANs via encryption, authentication, rogue access point detection, RF shielding, and polices Performing site surveys and identifying optimum access point locations Installing and configuring wireless LANs: planning, staging, deployment, documentation, and more Systematic testing to improve signal coverage, performance, and security Managing wireless LANs: help desk support, network monitoring, maintenance, engineering, configuration management, security, tools, and more Troubleshooting 802.11n networks: identifying issues with connectivity, performance, and more
Download or read book Implementing 802 11 802 16 and 802 20 Wireless Networks written by Ron Olexa and published by Elsevier. This book was released on 2004-08-04 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is not another book about installing a home or “hobby Wi-Fi system. Instead, this book shows you how to plan, design, install, and operate WLAN systems in businesses, institutions, and public settings such as libraries and hotels. In other words, this book is packed with serious information for serious professionals responsible for implementing robust, high performance WLANs covering areas as small as a coffee shop or as large as entire communities. Ron Olexa provides a solid foundation in RF/wireless theory as it applies to WLANs. His detailed, thorough coverage of propagation at GHz frequencies helps you understand the mysteries of WLAN coverage (such as how it can change from season to season due to foliage). You’ll also learn about antenna radiation patterns and gain so you can design you WLAN to have the coverage you need without causing interference to (or suffering interference from) other WLANs. Covers the widely used 802.11 family, as well as the new 802.16 and 802.20 standards Focuses on big commercial network implementations, such as in public buildings and businesses Author has over 25 years of experience with cellular systems and wireless networks
Download or read book IEEE 802 11 Handbook written by Bob O'Hara and published by IEEE Standards Association. This book was released on 2005-01-24 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first generation 802.11 wireless market, once struggling to expand, has spread from largely vertical applications such as healthcare, point of sale, and inventory management to become much more broad as a general networking technology being deployed in offices, schools, hotel guest rooms, airport departure areas, airplane cabins, entertainment venues, coffee shops, restaurants, and homes. This has led to the tremendous growth of new sources of IEEE 802.11 devices. IEEE 802.11 equipment is now moving into its second stage, where the wireless LAN is being treated as a large wireless communication system. As a system, there is more to consider than simply the communication over the air between a single access point and the associated mobile devices. This has lead to innovative changes in the equipment that makes up a wireless LAN. The IEEE 802.11 Handbook: A Designer’s Companion, Second Edition is for the system network architects, hardware engineers and software engineers at the heart of this second stage in the evolution of 802.11 wireless LANs and for those designers that will take 802.11 to the next stage.
Download or read book Wireless Networking Know It All written by Praphul Chandra and published by Elsevier. This book was released on 2007-09-14 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Newnes Know It All Series takes the best of what our authors have written to create hard-working desk references that will be an engineer's first port of call for key information, design techniques and rules of thumb. Guaranteed not to gather dust on a shelf!Wireless Networking: Know It All delivers readers from the basics of a wireless system such as antennas and transmitters to current hot topic wireless systems and technologies. The backbone to technologies and applications such as mobile, untethered Internet access, Internet telephony, and high quality multimedia content via the Web is completely covered in this reference. Chapter 1. Basics of Wireless Communications Chapter 2. Basics of Wireless Local Area Networks Chapter 3. Radio Transmitters and Receivers Chapter 4. Radio Propagation Chapter 5. Antennas and Transmission Lines Chapter 6. Communication Protocols and Modulation Chapter 7. High-Speed Wireless Data: System Types, Standards-Based and Proprietary Solutions Chapter 8. Propagation Modeling and Measuring Chapter 9. Indoor Networks Chapter 10. Security in Wireless Local Area Networks Chapter 11. Voice Over Wi-Fi and Other Wireless TechnologiesChapter 12. Mobile Ad Hoc NetworksChapter 13. Wireless Sensor Networks Chapter 14. Reliable Wireless Networks for Industrial Applications Chapter 15. Applications and Technologies Chapter 16. System Planning *A comprehensive overview from best-selling authors including Daniel Dobkin, Ron Olexa, and Alan Bensky*Explains the theory, concepts, design, and implementation of 802.11, 802.16, and 802.20 wireless networks – the three most popular types*Includes discussion of indoor networks, signal propagation, network security, and other topics essential for designing robust, secure wireless networks
Download or read book Designing and Deploying 802 11 Wireless Networks written by Jim Geier and published by . This book was released on 2015 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designing and Deploying 802.11 Wireless Networks Second Edition A Practical Guide to Implementing 802.11n and 802.11ac Wireless Networks For Enterprise-Based Applications Plan, deploy, and operate high-performance 802.11ac and 802.11n wireless networks The new 802.11ac standard enables WLANs to deliver significantly higher performance. Network equipment manufacturers have refocused on 802.11ac- and 802.11n-compliant solutions, rapidly moving older versions of 802.11 toward "legacy" status. Now, there's a complete guide to planning, designing, installing, testing, and supporting 802.11ac and 802.11n wireless networks in any environment, for virtually any application. Jim Geier offers practical methods, tips, and recommendations that draw on his decades of experience deploying wireless solutions and shaping wireless standards. He carefully introduces 802.11ac's fundamentally different design, site survey, implementation, and network configuration techniques, helping you maximize performance and avoid pitfalls. Geier organizes each phase of WLAN deployment into clearly defined steps, making the entire planning and deployment process easy to understand and execute. He illuminates key concepts and methods through realistic case studies based on current Cisco products, while offering tips and techniques you can use with any vendor's equipment. To build your skills with key tasks, you'll find several hands-on exercises relying on free or inexpensive tools. Whether you're deploying an entirely new wireless network or migrating from older equipment, this guide contains all the expert knowledge you'll need to succeed. Jim Geier has 30 years of experience planning, designing, analyzing and implementing communications, wireless, and mobile systems. Geier is founder and Principal Consultant of Wireless-Nets, Ltd., providing wireless analysis and design services to product manufacturers. He is also president, CEO, and co-founder of Health Grade Networks, providing wireless network solutions to hospitals, airports, and manufacturing facilities. His books include the first edition of Designing and Deploying 802.11n Wireless Networks (Cisco Press); as well as Implementing 802.1X Security Solutions and Wireless Networking Handbook. Geier has been active in the IEEE 802.11 Working Group and Wi-Fi Alliance; has chaired the IEEE Computer Society (Dayton Section) and various conferences; and served as expert witness in patent litigation related to wireless and cell ...
Download or read book Building Secure Wireless Networks with 802 11 written by Jahanzeb Khan and published by John Wiley & Sons. This book was released on 2003-02-03 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a step-by-step approach for planning and implementing a wireless LAN based on 802.11 Wireless Fidelity (Wi-Fi) technology Authors are Wi-Fi security experts who are able to address the firestorm of concerns about security for 802.11b networks Offers a clear perspective of interoperability with related wireless standards like 802.11a, HomeRF, and Bluetooth Explains how to achieve the same performance as a wired Ethernet connection and deliver flexibility and high speed
Download or read book 802 11n A Survival Guide written by Matthew Gast and published by "O'Reilly Media, Inc.". This book was released on 2012-04-06 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Building a network for the multitude of new devices is now a strategic decision for network engineers everywhere. This book give you an in-depth look at key parts of 802.11n, and shows you how to acheive an Ethernet-free wireless office"--Back cover.
Download or read book 802 11 Wi Fi written by Neil P. Reid and published by McGraw-Hill/Osborne Media. This book was released on 2003 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aims to help you break free with the wireless networking capabilities of 802.11. This guide provides hardware advice, radio frequency fundamentals, performance tips, architecture requirements, and more. It also aims to provide clarity on connectivity issues for laptop computers, personal digital assistants (PDAs), and peripherals.
Download or read book Secure Roaming in 802 11 Networks written by Paul Goransson and published by Newnes. This book was released on 2011-04-01 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Secure Roaming in 802.11 Networks offers a comprehensive treatise on Wi-Fi 802.11 roaming by comparing/contrasting it to cellular roaming theory and techniques. The book explores the fundamental concepts, basic theory, and key principles of 802.11 networks with roaming capabilities. It helps ensure secure and constant connectivity of laptops, PDAs and other emerging mobile devices. Today, we increasingly expect to find public Wide Local Area Network (WLAN) 802.11 access in our airports, public spaces, and hotels, and we want to maintain our connections when we’re mobile and using 802.11 WLANs. However, 802.11 was not originally designed with roaming capabilities and can’t, in its "pure" form, support seamless roaming between different hotspots and other 802.11 access points. This book details the theory behind various 802.11 extensions to permit roaming and describes how these extensions can be successfully implemented in 802.11 WLANs. It reviews coverage of user authentication in 802.11, as well as roaming between 802.11 and other wireless technologies. It also discusses wireless technologies and application programming interfaces. This book will appeal to RF/wireless engineers and designers, computer/data network engineers, and graduate students. * Offers a comprehensive treatise on Wi-Fi 802.11 roaming by comparing/contrasting it to cellular roaming theory and techniques * Emerges as a "one stop" resource for design engineers charged with fulfilling the market need for seamless 802.11 device roaming capabilities * Builds upon the knowledge base of a professional audience without delving into long discussions of theory long since mastered
Download or read book IEEE 802 11 Handbook written by Al Petrick and published by . This book was released on 2002 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Towards Gigabit and Green 802 11 Wireless Networks written by Ioannis Pefkianakis and published by . This book was released on 2012 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless is an increasingly dominant communication medium. The continued quest for wireless connectivity in a multitude of mobile devices, along with the emerging bandwidth hungry applications, has resulted in a huge growth of the wireless traffic. Multiple-Input Multiple-Output (MIMO) is considered the dominant technology to provide gigabit wireless links, and to accommodate the increasing demand of speed over wireless. By using multiple transmit and receive antennas, MIMO can support more reliable and faster communication. But how efficient are the current MIMO systems? Our experiments with commodity MIMO 802.11n devices reveal that, the MIMO wireless is low speed and energy hungry. The fundamental reason for MIMO devices' poor performance the use of legacy 802.11a/b/g, single antenna designs over the multiple antenna, MIMO 802.11n setting. Specifically, the existing designs used over the new MIMO 802.11n devices, are oblivious to MIMO unique communication characteristics. They do not also consider that, MIMO speed comes at the cost of increased power consumption, proportional to the number of antennas. In order to investigate solutions to these problems, this dissertation first experimentally studies the unique features of MIMO wireless and their impact on existing designs' performance. Then, it revises the key mechanisms that control speed and energy over MIMO wireless, named Rate Adaptation, and MIMO Energy Save, and develops three systems. History-Aware Robust Rate Adaptation (HA-RRAA) is our first step towards gigabit wireless. It opportunistically selects the best goodput PHY transmission rate for legacy 802.11a/b/g networks by introducing novel mechanisms to capture short-term channel dynamics. Different from HA-RRAA, our MIMO Rate Adaptation (MiRA) proposal, seeks to identify the best goodput PHY transmission rate in MIMO 802.11n networks by considering the unique features of MIMO. Finally, MIMO Energy Save seeks to select the optimal antenna setting at runtime to minimize energy consumption. Our proposals depart from existing designs in three fundamental ways. They manage the unique MIMO communication modes in a distinct manner. They consider new metrics, to capture the tradeoffs between speed and power consumption. Our proposals also apply novel learning mechanisms to capture the wireless channel dynamics. There are three main contributions in this dissertation. First, it builds a strong connection between wireless communication theory and wireless system design. Specifically, this dissertation provides the first experimental study of fundamental MIMO wireless communication tradeoffs (i.e. diversity vs. spatial multiplexing MIMO modes, speed vs. number of antennas) using 802.11n standard-compliant commodity testbeds. Then, it uncovers their impact on existing designs' performance. Second, it proposes novel and practical rate adaptation and energy save designs that consider MIMO unique characteristics, and are able deliver high performance gains. Third, this dissertation provides the first implementation and evaluation of MIMO rate adaptation and energy save using 802.11n standard-compliant commodity devices. The high performance in real world settings make our proposals a significant step towards gigabit and green wireless networks.
Download or read book Wireless Networking for Moving Objects written by Ivan Ganchev and published by Springer. This book was released on 2014-08-25 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless networks of moving objects have drawn significant attention recently. These types of networks consist of a number of autonomous or semi-autonomous wireless nodes/objects moving with diverse patterns and speeds while communicating via several radio interfaces simultaneously. To overcome current shortcomings, a number of research challenges have to be addressed in this area, ranging from initial conceptualization and modelling, to protocols and architectures engineering, and development of suitable tools, applications and services, and to the elaboration of realistic use-case scenarios by taking into account corresponding societal and economic aspects. By applying a systematic approach the objective of this book is to assess the state of the art and consolidate the main research results achieved in this area. It was prepared as the Final Publication of the COST Action IC0906 “Wireless Networking for Moving Objects (WiNeMO)”. The book contains 15 chapters and is a show-case of the main outcomes of the action in line with its scientific goals. The book will serve as a valuable reference for undergraduate students, post-graduate students, educators, faculty members, researchers, engineers, and research strategists working in this field.
Download or read book Wireless Networking Technology written by Steve A. Rackley and published by Elsevier. This book was released on 2011-02-23 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the demand for higher bandwidth has lead to the development of increasingly complex wireless technologies, an understanding of both wireless networking technologies and radio frequency (RF) principles is essential for implementing high performance and cost effective wireless networks.Wireless Networking Technology clearly explains the latest wireless technologies, covering all scales of wireless networking from personal (PAN) through local area (LAN) to metropolitan (MAN). Building on a comprehensive review of the underlying technologies, this practical guide contains ‘how to’ implementation information, including a case study that looks at the specific requirements for a voice over wireless LAN application. This invaluable resource will give engineers and managers all the necessary knowledge to design, implement and operate high performance wireless networks. · Explore in detail wireless networking technologies and understand the concepts behind RF propagation.· Gain the knowledge and skills required to install, use and troubleshoot wireless networks.· Learn how to address the problems involved in implementing a wireless network, including the impact of signal propagation on operating range, equipment inter-operability problems and many more.· Maximise the efficiency and security of your wireless network.
