Shaping Network Traffic
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Shaping Network Traffic
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Author : Noite.pl
language : en
Publisher: NOITE S.C.
Release Date :
Shaping Network Traffic written by Noite.pl and has been published by NOITE S.C. this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
The tc program - the main tool for bending the transfer – you get it and you do not. The micro-course describes shaping the network traffic with the Quality of Service services built in the Linux system kernel. Keywords: QoS, tc, fifo, queues, sfq Network traffic shaping IntServ DiffServ Traffic shaping in Linux Methods for bandwidth management Elements of traffic shaping model Naming The units used in the tc command Queuing discipline Classes Queuing algorithms Filters
Virtual Network Traffic Shaping Vnts Technique To Ensure Fairness In Virtual Wimax Networks
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Author : Ronak Daya
language : en
Publisher:
Release Date : 2009
Virtual Network Traffic Shaping Vnts Technique To Ensure Fairness In Virtual Wimax Networks written by Ronak Daya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Mobile communication systems categories.
This thesis presents the results of an experimental study on wireless network virtualization. The design and evaluation of virtualization methods for a WiMAX base station, a wireless technology of growing importance for emerging "4G" wide-area data services is performed using an experimental WiMAX base station which has recently been deployed at WINLAB, Rutgers University as part of the national GENI experimental network for future Internet research. The goal of this project was to benchmark the performance of this WiMAX base station with and without virtualization over a range of realistic scenarios, and to evaluate methods for improving fairness and isolation between virtual networks in the system under study. A set of mobile client experiments (without virtualization) show that the base station is capable of operating at peak rates of around 16 Mbps indoors, and that the achievable bit-rate at a mobile client varies considerably as a function of received signal strength (RSSI) at the mobile client. The next step was to perform virtualization of this device, using Kernel Virtual Machine (KVM); with multiple slices having the ability to share the same base station. Experimental results are performed for multiple virtual networks operating in realistic scenarios with varying received signal strength at mobile devices. The results show that virtual networks can have significant coupling between their throughput performance, and that unfairness is further amplified by autorate and scheduling algorithms in the WiMAX base station, which have the effect of moving resources to mobile clients with low signal-to-noise ratio. As a solution to the above mentioned problem, a Virtual Network Traffic Shaping (VNTS) technique is proposed and evaluated. An algorithm is developed using feedback from the base station's control interface to assess the current channel utilization for each slice. A control parameter in the form of downlink data rate is defined and this value is regulated dynamically for each slice, using an implementation of the Click Modular Router in order to maintain fairness across slices. The VNTS auto-reconfigures itself and imposes fairness at pre-set time intervals. We evaluate the performance of this mechanism and compare it to the initial results that were observed for the uncontrolled scenario. Preliminary results indicate that the VNTS scheme effectively implements fairness, and helps to reduce the coupling between slices.
Quality Of Service
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Author : Paul Ferguson
language : en
Publisher:
Release Date : 1998-02-09
Quality Of Service written by Paul Ferguson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-02-09 with Computers categories.
Develop cost-effective, long-term solutions to your network traffic control problems. Even if you can find the money to do it, overengineering your network will not solve your traffic flow problems. As the authors of this groundbreaking guide clearly demonstrate, the best long-term solution to network congestion and bottlenecks can be found in a set of Quality of Service (QoS) architectures, policies, and technologies known as differentiated Classes of Service (CoS). Quality of Service is a valuable working resource for technical managers charged with solving the problem of how to handle the exploding volume of traffic on their companies' networks. The authors explore the roots of the current network traffic control crisis and they provide a realistic assessment of the gamut of standard, new, and emerging QoS/CoS technologies. They consider all crucial, design, cost, and support issues surrounding quality of service deployment for all types of networks, including intranets and multimedia networks. And they provide managers with a rational framework for finding the most cost-effective QoS/CoS solutions to their organizations' long-term networking goals. Key technical issues covered include: * Queuing disciplines, traffic shaping, and admission control techniques * Quality and differentiation hooks found in TCP/IP * Getting the most out of Frame Relay and ATM technologies * QoS/CoS techniques for dial-up services * Integrated Services Architecture and RSVP. Visit this book's companion website at www.wiley.com/compbooks/ferguson
Pattern Based Traffic Shaping
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Author : Abdul Azim
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2010-06
Pattern Based Traffic Shaping written by Abdul Azim and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-06 with categories.
Real time tests, simulation and network emulation are applied to test uniformity, accuracy, reproducibility and dynamicity. Network Emulation is performed over experimental network to test real time application, protocol and traffic parameters. DummyNet is a network emulator and traffic shaper which allows nondeterministic placement of packet losses, delays and bandwidth changes. KauNet shaper is a network emulator which creates traffic patterns and applies these patterns for exact deterministic placement of bit-errors, packet losses, delay changes and bandwidth changes. An evaluation of KauNet with different patterns for packet losses, delay changes and bandwidth changes on emulated environment is part of this work. The main motivation for this work is to check the possibility to delay and drop the packets of a transfer/session in the same way as it has happened before (during the observation period). This goal is achieved to some extent using KauNet but some issues with pattern repetitions are still needed to be solved to get better results. The idea of history and trace-based traffic shaping using KauNet is given to make this possibility a reality.
Traffic Shaping For Congestion Control In High Speed Atm Networks
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Author : University of Saskatchewan. Dept. of Computational Science
language : en
Publisher:
Release Date : 1992
Traffic Shaping For Congestion Control In High Speed Atm Networks written by University of Saskatchewan. Dept. of Computational Science and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Asynchronous transfer mode categories.
Design And Analysis Of Traffic Shaping And Scheduling In A Fast Switch Network
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Author : A. Alfred Joseph Jude
language : en
Publisher:
Release Date : 2003
Design And Analysis Of Traffic Shaping And Scheduling In A Fast Switch Network written by A. Alfred Joseph Jude and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Computer network architectures categories.
Design Issues At Atm Networks
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Author : Gustavo Antonio De Veciana
language : en
Publisher:
Release Date : 1993
Design Issues At Atm Networks written by Gustavo Antonio De Veciana and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
The Local And Global Effects Of Traffic Shaping
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Author :
language : en
Publisher:
Release Date : 2008
The Local And Global Effects Of Traffic Shaping written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Computer networks categories.
Abstract: "The Internet is witnessing explosive growth in traffic, in large part due to bulk content transfers. Delivering such traffic is expensive for ISPs because they pay their peers based on peak levels of utilization, e.g., the 95% utilization. To limit costs, many ISPs are deploying ad-hoc traffic shapers at the edge of their networks that rate-limit the bandwidth consumed by bulk flows. However, there is relatively little understanding today about how effective different shaping policies are in reducing peak loads or how shaping affects flows when it is deployed locally by a single ISP as well as globally across different ISPs. In this paper, we show that a simple traffic shaping policy that throttles bulk flows only during times of peak utilization can maintain low levels of peak utilization with a limited slowdown to bulk transfers. This semingly win-win situation incentivizes all ISPs to perform this style of traffic shaping. Unfortunately, due to the offsets in the local times of peak utilization at different links in the network, bulk transfers traveling sufficiently far will always be throttled by some ISP between the source and destination. In effect, a semingly effective local policy results in dramatic slowdowns of bulk transfers when globally deployed. We present a data staging service that counteracts the deleterious end-to-end effects of local traffic shaping, by delaying bulk data at appropriate hops in the network to consume bandwidth when available. We show that the service is incrementally deployable and has modest storage requirements."
Efficient Network Qos Provisioning Based On Per Node Traffic Shaping
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Author : International Business Machines Corporation. Research Division
language : en
Publisher:
Release Date : 1995
Efficient Network Qos Provisioning Based On Per Node Traffic Shaping written by International Business Machines Corporation. Research Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Computer networks categories.
Abstract: "We address the problem of providing per-connection end-to-end delay guarantees in a high-speed network. We assume that the network is connection oriented and enforces some admission control which ensures that the source traffic conforms to specified traffic characteristics. We concentrate on the class of rate-controlled service disciplines, in which traffic from each connection is reshaped at every hop. The main disadvantage of this class of service disciplines is that the end-to-end delay guarantees are obtained as the sum of the worst case delays at each node. In this paper, we show that this problem can be alleviated through 'proper' reshaping of the traffic, and derive end-to- end bounds for the general case of arbitrary reshaping at each hop. We establish that these bounds can also be achieved when all hops use the same shapers which, in order to achieve good delay bounds, are in general different from the original envelope of the source traffic. We illustrate the impact of this reshaping by demonstrating its use in designing rate- controlled service disciplines which outperform GPS-based service disciplines. Furthermore, we show that we can restrict the space of 'good' shapers to a family which is characterized by only one parameter. We also describe extensions to the service discipline that make it work conserving, and as a result reduce average delays."
Traffic Management Of Atm Networks
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Author : Steven Hwye Low
language : en
Publisher:
Release Date : 1992
Traffic Management Of Atm Networks written by Steven Hwye Low and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.