Pub Date : 2007-06-10DOI: 10.1109/LANMAN.2007.4295982
M. Rabby, K. Ravindran
The paper discusses the dynamics of bandwidth allocations that occur in an end-to-end QoS-aware data transport system over a LAN-MAN. Here, the controlled object is a logical connection that carries the application-level data flows over the service provider's data transport infrastructure. The goal is to allocate just-enough bandwidth, in order to maximize the service-provider revenues. Accurate control of bandwidth allocations with a revenue-oriented goal is quite complex, due to the interactions among various data flows that dynamically share the network capacity in the system. So, we employ an on-line monitor-and-control scheme, aided by heuristics, that iteratively adjusts the bandwidth allocation based on the observed packet loss rate. The bandwidth allocation is increased when the observed packet loss rate exceeds a user-specified threshold, with the increase being proportional to the loss rate (i.e., multiplicative increase). The bandwidth is decreased additively when the loss rate falls below a safe limit. We describe this MIAD-based bandwidth allocation scheme, and study its dynamics. When the LAN-MAN environments provide bandwidth capacities in a stable manner, our MIAD scheme can achieve an optimal bandwidth allocation (in the sense of user-level QoS and service-provider revenues).
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Complexity and diversity of Internet traffic are constantly growing. Networking researchers become aware of the need to constantly monitor and reevaluate their assumptions in order to ensure that the conceptual models correctly represent reality. Using the dataset collected by NetTurbo from three different bidirectional OC-48 links in metro area networks at the two biggest ISPs of China, this paper carefully investigates the self-similar characteristics of traffic from different aspects. In contrast to the previous results which have been widely accepted, this paper shows that for the aggregated traffic and the TCP and UDP traffic whether the self-similarity exists is uncertain. Further, break down by the application category, only the traditional and uncategorized traffic are self-similar while the others are not. However, on the view of the individual application of each category, it seems that traffic of every application exhibits self-similarity. To the best of our knowledge, this paper firstly provides the experimental evidence showing that aggregating different groups of self-similar traffic series could generate a traffic series which is either self-similar or non-self-similar.
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Pub Date : 2007-06-10DOI: 10.1109/LANMAN.2007.4295999
R. Vasudevan, Z. Morley Mao, O. Spatscheck, J. Merwe
We usually have well-defined classification scales to estimate the intensity and impact of natural disasters. Prominent examples are the Richter and the Fujita scales for measuring earthquakes and tornadoes respectively. In this paper, we apply similar ideas to estimate the impact of distributed denial of service (DDoS) attacks from the perspective of network operators. Devising such a classification scale improves our understanding of DDoS attacks by assessing the actual damage incurred from an ISP's perspective, and allows comparison of various mitigation strategies. We have designed MIDAS, a DDoS impact scale, based on the economic impact of a DDoS attack, calculated using economic and network data. We then present an approximation of the MIDAS scale that relies only on network measurements for ease of computation. To demonstrate the usefulness of the scale, we perform sensitivity analysis to qualitatively validate the magnitude of the scale value for diverse attacks.
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Pub Date : 2007-06-10DOI: 10.1109/LANMAN.2007.4295971
J. Simsarian, M. Duelk
In this paper, we analyze the bandwidth requirements in Metropolitan Area Networks (MANs) for providing Internet Protocol Television (IPTV) services. We find that the application with the potential to generate high bandwidth in the MAN is Video on Demand (VoD). However, the amount of bandwidth in the MAN depends on the location of the video servers and cached video content. Therefore, we develop a model of the IPTV network to determine the optimum location of the cached video content. From this model, we find the dependence of the MAN traffic on the fraction of users simultaneously requesting VoD streams. The results show that a significant fraction of future MAN traffic, up to 90%, may be due to these on-demand video services.
{"title":"IPTV Bandwidth Demands in Metropolitan Area Networks","authors":"J. Simsarian, M. Duelk","doi":"10.1109/LANMAN.2007.4295971","DOIUrl":"https://doi.org/10.1109/LANMAN.2007.4295971","url":null,"abstract":"In this paper, we analyze the bandwidth requirements in Metropolitan Area Networks (MANs) for providing Internet Protocol Television (IPTV) services. We find that the application with the potential to generate high bandwidth in the MAN is Video on Demand (VoD). However, the amount of bandwidth in the MAN depends on the location of the video servers and cached video content. Therefore, we develop a model of the IPTV network to determine the optimum location of the cached video content. From this model, we find the dependence of the MAN traffic on the fraction of users simultaneously requesting VoD streams. The results show that a significant fraction of future MAN traffic, up to 90%, may be due to these on-demand video services.","PeriodicalId":347028,"journal":{"name":"2007 15th IEEE Workshop on Local & Metropolitan Area Networks","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124859911","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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