The main characteristics of ad hoc networks are the lack of predefined infrastructure and the dynamic topology. These characteristics present some new security vulnerabilities for this emerging networking paradigm. Usually, security in ad hoc networks is handled through authentication and encryption. This can be considered as a first line of defense, however, this remain inefficient against some other kind of attacks such as malicious packet dropping. The purpose of this work is to provide a mechanism for detecting malicious incorrect packet forwarding attacks. To this end, a trust model extending routing protocols and based on the reputation concept is developed. Our model provides two main functionalities: monitoring the behavior of the neighboring nodes in the network and computing their reputations based on the information provided by the monitoring. This paper also discusses how the reputation information is gathered, stored and exchanged between the nodes, and computed according to the different scenarios. Our mechanism is also validated with some simulation work showing its feasibility, performance and benefits.
ad hoc网络的主要特点是缺乏预定义的基础结构和动态拓扑结构。这些特征为这种新兴的网络范例带来了一些新的安全漏洞。通常，自组织网络中的安全性是通过身份验证和加密来处理的。这可以被视为第一道防线，但是，对于其他类型的攻击(如恶意数据包丢弃)，这仍然是低效的。这项工作的目的是提供一种检测恶意错误数据包转发攻击的机制。为此，提出了一种基于信誉概念的扩展路由协议的信任模型。我们的模型提供了两个主要功能:监控网络中相邻节点的行为，并根据监控提供的信息计算它们的声誉。本文还讨论了信誉信息如何在节点之间收集、存储和交换，以及如何根据不同的场景进行计算。通过一些仿真工作验证了该机制的可行性、性能和效益。
{"title":"A reputation-based trust mechanism for ad hoc networks","authors":"Y. Rebahi, Kaiserin Augusta Allee","doi":"10.1109/ISCC.2005.17","DOIUrl":"https://doi.org/10.1109/ISCC.2005.17","url":null,"abstract":"The main characteristics of ad hoc networks are the lack of predefined infrastructure and the dynamic topology. These characteristics present some new security vulnerabilities for this emerging networking paradigm. Usually, security in ad hoc networks is handled through authentication and encryption. This can be considered as a first line of defense, however, this remain inefficient against some other kind of attacks such as malicious packet dropping. The purpose of this work is to provide a mechanism for detecting malicious incorrect packet forwarding attacks. To this end, a trust model extending routing protocols and based on the reputation concept is developed. Our model provides two main functionalities: monitoring the behavior of the neighboring nodes in the network and computing their reputations based on the information provided by the monitoring. This paper also discusses how the reputation information is gathered, stored and exchanged between the nodes, and computed according to the different scenarios. Our mechanism is also validated with some simulation work showing its feasibility, performance and benefits.","PeriodicalId":315855,"journal":{"name":"10th IEEE Symposium on Computers and Communications (ISCC'05)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131769731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Properly reacting to congestion is known to be a requirement for maintaining the stability of the Internet; in addition, UDP based applications should do so for their own sake if they are delay- or loss-sensitive. We measured the responsiveness of the three popular streaming media applications RealPlayer, Windows MediaPIayer and Quicktime with a varying amount of cross traffic and present a comparison of the results.
众所周知，对拥塞作出适当反应是维护互联网稳定的必要条件;此外，如果基于UDP的应用程序对延迟或丢失敏感，则应该这样做。我们测量了三个流行的流媒体应用程序RealPlayer, Windows MediaPIayer和Quicktime在不同数量的交叉流量下的响应性，并给出了结果的比较。
{"title":"An empirical study of the congestion response of RealPlayer, Windows MediaPlayer and Quicktime","authors":"Sven Hessler, M. Welzl","doi":"10.1109/ISCC.2005.25","DOIUrl":"https://doi.org/10.1109/ISCC.2005.25","url":null,"abstract":"Properly reacting to congestion is known to be a requirement for maintaining the stability of the Internet; in addition, UDP based applications should do so for their own sake if they are delay- or loss-sensitive. We measured the responsiveness of the three popular streaming media applications RealPlayer, Windows MediaPIayer and Quicktime with a varying amount of cross traffic and present a comparison of the results.","PeriodicalId":315855,"journal":{"name":"10th IEEE Symposium on Computers and Communications (ISCC'05)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117260480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A key element for MANET performance is the routing protocol. Surprisingly, little effort has been devoted up to now to analyzing the impact of routing protocol parameter settings on MANET performance. We define and study in detail the route change latency (RCL) after link failures, a critical performance metric in a non-static ad-hoc scenario, and its dependence on routing protocol parameter settings and implementation issues using OLSR. We experiment with a set of OLSR settings in a real network environment and derive its potential effect in a generic situation, showing that end-to-end connectivity can be enhanced using different parameter settings from the default ones.
{"title":"Improving performance of a real ad-hoc network by tuning OLSR parameters","authors":"Carles Gomez, D. García, J. Paradells","doi":"10.1109/ISCC.2005.83","DOIUrl":"https://doi.org/10.1109/ISCC.2005.83","url":null,"abstract":"A key element for MANET performance is the routing protocol. Surprisingly, little effort has been devoted up to now to analyzing the impact of routing protocol parameter settings on MANET performance. We define and study in detail the route change latency (RCL) after link failures, a critical performance metric in a non-static ad-hoc scenario, and its dependence on routing protocol parameter settings and implementation issues using OLSR. We experiment with a set of OLSR settings in a real network environment and derive its potential effect in a generic situation, showing that end-to-end connectivity can be enhanced using different parameter settings from the default ones.","PeriodicalId":315855,"journal":{"name":"10th IEEE Symposium on Computers and Communications (ISCC'05)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121716804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The implementation of successful assured forwarding (AF) services according to the DiffServ framework remains a challenging problem today, despite the numerous proposals for AF PHB mechanisms and AF-based service implementations. In this work, we propose two modules, the TCP-window aware marker (TWAM) and the dynamic WRED (DWRED) mechanism for implementing the DiffServ AF PHB. We provide analytical models and an experimental evaluation in order to demonstrate how they succeed in enhancing the quality, increasing fairness, improving the performance and easing the deployment of a production- level AF-based service.
尽管有许多关于AF- PHB机制和基于AF的服务实现的建议，但是根据DiffServ框架实现成功的保证转发(AF)服务仍然是一个具有挑战性的问题。在这项工作中，我们提出了两个模块，tcp窗口感知标记(TWAM)和动态WRED (DWRED)机制来实现DiffServ AF PHB。我们提供了分析模型和实验评估，以证明它们如何成功地提高了质量，增加了公平性，提高了性能，并简化了生产级基于af的服务的部署。
{"title":"Performance enhancement of an AF service using TCP-aware marking and dynamic WRED","authors":"C. Bouras, A. Sevasti","doi":"10.1109/ISCC.2005.121","DOIUrl":"https://doi.org/10.1109/ISCC.2005.121","url":null,"abstract":"The implementation of successful assured forwarding (AF) services according to the DiffServ framework remains a challenging problem today, despite the numerous proposals for AF PHB mechanisms and AF-based service implementations. In this work, we propose two modules, the TCP-window aware marker (TWAM) and the dynamic WRED (DWRED) mechanism for implementing the DiffServ AF PHB. We provide analytical models and an experimental evaluation in order to demonstrate how they succeed in enhancing the quality, increasing fairness, improving the performance and easing the deployment of a production- level AF-based service.","PeriodicalId":315855,"journal":{"name":"10th IEEE Symposium on Computers and Communications (ISCC'05)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123347405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mátyás Martinecz, A. Kern, Zalán Heszberger, J. Bíró
Recent Internet access speeds have made it possible even for home users to reach and use previously unavailable bandwidth consuming (e.g. video on demand) services. However, the rapid spread of these applications is hindered by the lack of QoS guarantees in packet networks. In this article a QoS architecture is presented which have been designed for access networks and applies a logical overlay network to make network management tasks easier. The novelty of the architecture lies in the application of two key procedures adopted for dimensioning logical channels between edge nodes and mapping them to the physical routes. The upper load thresholds of the applied logical channels are also determined, which may form the basis of a more sophisticated call admission control policy.
{"title":"Architecture and configuration of broadband access networks supporting multimedia applications","authors":"Mátyás Martinecz, A. Kern, Zalán Heszberger, J. Bíró","doi":"10.1109/ISCC.2005.35","DOIUrl":"https://doi.org/10.1109/ISCC.2005.35","url":null,"abstract":"Recent Internet access speeds have made it possible even for home users to reach and use previously unavailable bandwidth consuming (e.g. video on demand) services. However, the rapid spread of these applications is hindered by the lack of QoS guarantees in packet networks. In this article a QoS architecture is presented which have been designed for access networks and applies a logical overlay network to make network management tasks easier. The novelty of the architecture lies in the application of two key procedures adopted for dimensioning logical channels between edge nodes and mapping them to the physical routes. The upper load thresholds of the applied logical channels are also determined, which may form the basis of a more sophisticated call admission control policy.","PeriodicalId":315855,"journal":{"name":"10th IEEE Symposium on Computers and Communications (ISCC'05)","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123996526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper deals with measurement-based CAC alternatives applicable to the novel WIND-FLEX architecture, a 17 GHz wireless LAN recently developed in the framework of an European 1ST project. We first present some existing CAC algorithms based on traffic stream measurement. Afterwards, we develop a novel CAC algorithm which is based on queue state measurement. The performance of the different CAC algorithms is then evaluated by extensive simulations. One of the main conclusions from simulative investigations is that our novel CAC algorithm is superior to other ones from the aspects of achievable utilization and parameter robustness. Moreover the proposed solution requires no additional signaling overhead and demands low implementation complexity.
{"title":"17 GHz wireless LAN: performance analysis of CAC algorithms","authors":"G. Razzano, H. T. Tran, Camilla Cantarella","doi":"10.1109/ISCC.2005.5","DOIUrl":"https://doi.org/10.1109/ISCC.2005.5","url":null,"abstract":"The paper deals with measurement-based CAC alternatives applicable to the novel WIND-FLEX architecture, a 17 GHz wireless LAN recently developed in the framework of an European 1ST project. We first present some existing CAC algorithms based on traffic stream measurement. Afterwards, we develop a novel CAC algorithm which is based on queue state measurement. The performance of the different CAC algorithms is then evaluated by extensive simulations. One of the main conclusions from simulative investigations is that our novel CAC algorithm is superior to other ones from the aspects of achievable utilization and parameter robustness. Moreover the proposed solution requires no additional signaling overhead and demands low implementation complexity.","PeriodicalId":315855,"journal":{"name":"10th IEEE Symposium on Computers and Communications (ISCC'05)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128962561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An anycast service in a QoS-based network requires to setup paths with bandwidth guarantees and to select a server with capacity guarantees. This paper proposes an architecture which integrates both network layer anycasting service and application layer anyscasting service in order to select both a path and a server that satisfies the client QoS constrain in DiffServ networks. To perform a path selection algorithm, the proposed protocol uses the idea of residual capacity to select all paths which match the client bandwidth requirement. To perform the server selection process, each server resource management (SRM) uses server weight of each server to select a best server that has available capacity for the client request. Furthermore, the design of multiple SRMs eliminates the single point of failure and increases reliability in a DiffServ network. The simulation results have shown that the proposed protocol has much faster server response time and has lowest request blocking rate than other existing protocols, especially in the case where the traffic load is high.
{"title":"An integrated anycast end-to-end QoS routing on DiffServ networks","authors":"Wu-Hsiao Hsu, Cheng-Lin Yang, Li-Yuan Wu, Chiun-Sheng Hsu","doi":"10.1109/ISCC.2005.28","DOIUrl":"https://doi.org/10.1109/ISCC.2005.28","url":null,"abstract":"An anycast service in a QoS-based network requires to setup paths with bandwidth guarantees and to select a server with capacity guarantees. This paper proposes an architecture which integrates both network layer anycasting service and application layer anyscasting service in order to select both a path and a server that satisfies the client QoS constrain in DiffServ networks. To perform a path selection algorithm, the proposed protocol uses the idea of residual capacity to select all paths which match the client bandwidth requirement. To perform the server selection process, each server resource management (SRM) uses server weight of each server to select a best server that has available capacity for the client request. Furthermore, the design of multiple SRMs eliminates the single point of failure and increases reliability in a DiffServ network. The simulation results have shown that the proposed protocol has much faster server response time and has lowest request blocking rate than other existing protocols, especially in the case where the traffic load is high.","PeriodicalId":315855,"journal":{"name":"10th IEEE Symposium on Computers and Communications (ISCC'05)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126889344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zsolt Kenesi, Zoltán Szabó, Zsolt Belicza, S. Molnár
The utilization of the free capacity by the TCP congestion control is not perfect due to the complex fluctuations of the background traffic resulting in reduced throughput. Different frequency components of the background traffic have different effects on the TCP performance. In this paper we present a comprehensive TCP performance evaluation study to understand the nature of the TCP adaptivity mechanism in frequency domain. Through simulations we analyze the impact of network parameters and also some alternatives for compensation of the throughput reduction. Finally, based also on the analysis of measured TCP traffic we investigate the robustness of TCP to fluctuations occur in actual network traffic.
{"title":"On the effect of the background traffic on TCP's throughput","authors":"Zsolt Kenesi, Zoltán Szabó, Zsolt Belicza, S. Molnár","doi":"10.1109/ISCC.2005.111","DOIUrl":"https://doi.org/10.1109/ISCC.2005.111","url":null,"abstract":"The utilization of the free capacity by the TCP congestion control is not perfect due to the complex fluctuations of the background traffic resulting in reduced throughput. Different frequency components of the background traffic have different effects on the TCP performance. In this paper we present a comprehensive TCP performance evaluation study to understand the nature of the TCP adaptivity mechanism in frequency domain. Through simulations we analyze the impact of network parameters and also some alternatives for compensation of the throughput reduction. Finally, based also on the analysis of measured TCP traffic we investigate the robustness of TCP to fluctuations occur in actual network traffic.","PeriodicalId":315855,"journal":{"name":"10th IEEE Symposium on Computers and Communications (ISCC'05)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121616631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jhon J. Padilla Aguilar, M. Huerta, J. Aspas, X. Hesselbach
This paper proposes an approach to support end-to-end quality of service over IPv6 networks. In our solution, IPv6 flow labels are used to give better performance into the process of packet classification on network routers. In order to evaluate our proposal, a router model is obtained and it is compared with other technologies as IntServ and MPLS. As result, we obtain a solution with benefits of QoS support and label switching in IPv6 routers.
{"title":"IntServ6: an approach to support QoS over IPv6 networks","authors":"Jhon J. Padilla Aguilar, M. Huerta, J. Aspas, X. Hesselbach","doi":"10.1109/ISCC.2005.86","DOIUrl":"https://doi.org/10.1109/ISCC.2005.86","url":null,"abstract":"This paper proposes an approach to support end-to-end quality of service over IPv6 networks. In our solution, IPv6 flow labels are used to give better performance into the process of packet classification on network routers. In order to evaluate our proposal, a router model is obtained and it is compared with other technologies as IntServ and MPLS. As result, we obtain a solution with benefits of QoS support and label switching in IPv6 routers.","PeriodicalId":315855,"journal":{"name":"10th IEEE Symposium on Computers and Communications (ISCC'05)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126200415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
InfiniBand (IBA) has been proposed as an industry-standard architecture both for I/O server and interprocessor communication. IBA employs a switched point-to-point network, instead of using a shared bus. IBA is being developed by the InfiniBand/sub SM/ Trade Association to provide present and future server systems with the required levels of reliability, availability, performance, scalability, and quality of service (QoS). In previous papers we have proposed an effective strategy for configuring the IBA networks to provide users with the required levels of QoS. This strategy is based on the proper configuration of the mechanisms IBA carries to support QoS. Specifically, our methodology configures the InfiniBand arbitration tables and uses the different service levels and virtual lanes that are available, in order to segregate the different traffic flows. Thus, each flow receives the treatment it has previously requested. Moreover, by using our methodology, applications can be assured that their requirements will be satisfied. In this paper, we review the basis of our methodology and we study the influence of the packet size on the QoS guaranteed to the applications.
{"title":"Studying the influence of the InfiniBand packet size to guarantee QoS","authors":"F. J. Alfaro, J. L. Sánchez, J. Duato","doi":"10.1109/ISCC.2005.140","DOIUrl":"https://doi.org/10.1109/ISCC.2005.140","url":null,"abstract":"InfiniBand (IBA) has been proposed as an industry-standard architecture both for I/O server and interprocessor communication. IBA employs a switched point-to-point network, instead of using a shared bus. IBA is being developed by the InfiniBand/sub SM/ Trade Association to provide present and future server systems with the required levels of reliability, availability, performance, scalability, and quality of service (QoS). In previous papers we have proposed an effective strategy for configuring the IBA networks to provide users with the required levels of QoS. This strategy is based on the proper configuration of the mechanisms IBA carries to support QoS. Specifically, our methodology configures the InfiniBand arbitration tables and uses the different service levels and virtual lanes that are available, in order to segregate the different traffic flows. Thus, each flow receives the treatment it has previously requested. Moreover, by using our methodology, applications can be assured that their requirements will be satisfied. In this paper, we review the basis of our methodology and we study the influence of the packet size on the QoS guaranteed to the applications.","PeriodicalId":315855,"journal":{"name":"10th IEEE Symposium on Computers and Communications (ISCC'05)","volume":"276 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120928930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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