2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)最新文献

{"title":"Optimal routing for efficient Internet networks","authors":"W. Ben Ameur, N. Bourquia, É. Gourdin, P. Tolla","doi":"10.1109/ECUMN.2002.1002084","DOIUrl":"https://doi.org/10.1109/ECUMN.2002.1002084","url":null,"abstract":"In order to face the explosion of traffic in the Internet, the administrators who had a tendency to oversize their network have turned to new protocols aiming at better control of the routing and a better distribution of the traffic. New routing paradigms (MPLS) allowing explicit tunnel definitions are slowly emerging in the Internet community. However, the routing tables are still very often defined according to classical protocols (OSPF, IS-IS, . . .). In those protocols, the routing paths are defined as shortest paths according to weights (called administrative weights) associated to the network links and arbitrarily defined by the network administrator. In these networks, the general routing pattern is hence entirely defined by the weights. We investigate the problem of jointly determining network weights and routing paths in a given capacitated network in order to optimize a certain network performance criterion. Each traffic demand is routed on a single shortest path.","PeriodicalId":398555,"journal":{"name":"2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128762067","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}

{"title":"Packet based load sharing schemes in MPLS networks","authors":"R. Casellas, J. Rougier, D. Kofman","doi":"10.1109/ECUMN.2002.1002085","DOIUrl":"https://doi.org/10.1109/ECUMN.2002.1002085","url":null,"abstract":"By adding a connection oriented layer to legacy IP routing and forwarding, the MPLS architecture provides new mechanism to perform traffic engineering in IP networks. Current MPLS request for comments and drafts have identified MPLS protection switching and load sharing as attractive applications of these mechanisms, overcoming the limitations of legacy IP routing. Existing load balancing IP routing protocols and architectures (ECMP, OSPF-OMP, etc.) have limited load sharing capabilities to avoid loops (e.g. only for equal cost paths for ECMP), usually based on fixed administrative metrics. Given the connection nature of MPLS networks, arbitrary load sharing algorithms can be performed without leading to loops. In this paper we propose and evaluate a family of load sharing schemes that take into account the nature of the aggregated traffic as well as the link capacities and administrative lengths. We propose cost functions that reflect/penalize LSP congestion, using overflow estimates and we derive optimality conditions. For example, for equal length paths (in the sense of legacy administrative metrics) under particular conditions, the optimal load share is based on the sole bottleneck capacity of the LSP: the optimal load share splits traffic according to the pragmatic rule of proportional capacities regardless of the aggregated traffic, as long as the stability constraints are respected. However, the statistical properties of the traffic (thus the cost functions) give important feedback and stochastic bounds when not in the optimal case, either in the event of a failure or when the real bottleneck capacity differs from the nominal one. We illustrate our schemes with simple but significant examples.","PeriodicalId":398555,"journal":{"name":"2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128605175","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}

{"title":"Active shaping: a countermeasure against DDoS attacks","authors":"D. Kashiwa, E. Chen, H. Fuji","doi":"10.1109/ECUMN.2002.1002103","DOIUrl":"https://doi.org/10.1109/ECUMN.2002.1002103","url":null,"abstract":"Distributed denial of service (DDoS) attacks are a pressing problem on the Internet as demonstrated by attacks on major e-commerce servers and ISPs. Since the attack is distributed and the attack tools evolve at a rapid and alarming rate, an effective solution must be formulated using a distributed and adaptive approach. In this paper, we propose a countermeasure against DDoS attacks using a method we call active shaping. The core-enabling technology of this framework is the active network, which allows us to detect, backtrack and defend against attacks at suitable network nodes and minimize damage. We also evaluate the effectiveness of our system using a prototype.","PeriodicalId":398555,"journal":{"name":"2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129173075","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}

{"title":"Parlay and mobile agents in a homogenized service provision architecture","authors":"E. S. Chaniotakis, A. Papadakis, N.D. Tselikas, G.A. Leoleis, I. Venieris","doi":"10.1109/ECUMN.2002.1002100","DOIUrl":"https://doi.org/10.1109/ECUMN.2002.1002100","url":null,"abstract":"This paper describes an innovative architecture for creation and provision of services running homogeneously over different networks. This primarily implies the fact that the service logic has to be independent of the underlying network. Until now, such convergence between public switched telephony network (PSTN) and Internet is achieved in the transport layer. This is the case of dial-up connection where the telephony access network is used to connect the Internet service provider with the user. This would be also the case when the telephony service providers are routing calls through IP networks to reduce costs. In these cases, only the lowermost layers are replaced and so the homogenization of provided services can be viewed less portentously. In the cases where service interworking takes place in a higher level (e.g. WAP in the application layer), the convergence is based on the implementation of proprietary gateways, which are usually suitable for specific situations. The nature of service creation and provision differs in PSTN and Internet. The PSTN is oriented towards the provision of telephony service and other call-related services. These services use the concept of a call, the establishment of which allows the exchange of bit streams between the parties participating in the call. Call-related services can be based to a call model similar to the basic call state model (BCSM), which has been described in the intelligent network (IN) specifications. Among different architectures aiming at the provision of advanced telecommunication services, IN is worldwide an accepted service control architecture. In this paper the term IN can be applied for telecommunication networks based on PSTN infrastructure. On the other hand, Internet is a generic packet switching network. Its services concentrate on the abilities and the intelligence of terminals. Nevertheless, Internet applications could not be described using a model similar to the BCSM. This happened due to the inability of intermediate nodes to maintain information about the state of a running service. This situation has been confuted by the Voice over IP (VoIP) protocols. The H.323, SIP and MEGACO protocols foresee entities like gatekeepers and media gateway controllers, whose functionality is to maintain call state information. Using these entities it is possible to build an IP (soft) switch that could perform tasks similar to the PSTN switches. The key issue to achieve a signaling interworking between PSTN and Internet is to apply the appropriate mappings between the protocols used in IP telephony and making sure that a common call state model is suitable for all of them. Since the call control protocol that is used from H.323 is the Q.931 the above prerequisite could be easily applied. The same happens with the SIP, where initiating call messages could be mapped to Q.931 using a signaling gateway that converts SIP messages to Q.931 and vice versa. This way signaling interworking has been a","PeriodicalId":398555,"journal":{"name":"2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115922991","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}

{"title":"An experiment of video communication using active networks","authors":"R. Hammi, K. Chen","doi":"10.1109/ECUMN.2002.1002101","DOIUrl":"https://doi.org/10.1109/ECUMN.2002.1002101","url":null,"abstract":"In this paper, we report an experimental result on video communication over an active network. Video communication needs to be monitored and adapted when it traverses the IP environment. The emerging active network technology allows dynamic deployment of services including traffic monitoring and adaptation. Thus, the Active Network technology provides functionality, which is well suited to the handling of video communication. Our experiment on a PC-based testbed proves that monitoring and adaptation of video streams can be done in an efficient way, and the overhead due to the active network is not penalising. Based on this experience, we believe that the active network technology can be used at the networks' edges to offer customised and dynamically video transmission services in an effective way.","PeriodicalId":398555,"journal":{"name":"2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116335139","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}

{"title":"Application decomposition for high-speed network processing platforms","authors":"N. Nikolaou, J.-A. Sanchez P, T. Orphanoudakis, D. Pollatos, N. Zervos","doi":"10.1109/ECUMN.2002.1002121","DOIUrl":"https://doi.org/10.1109/ECUMN.2002.1002121","url":null,"abstract":"The rapid advancements in optical networking have increased the capacity of physical links. As an alternative to the ASIC or generic microprocessor-based approaches, new semiconductor devices have emerged, called network processors (NP), optimised to provide programmable processing of protocol data units in networks with diverse requirements for current and emerging protocols and services. In this paper we present a NP architecture that targets the tight coupling of software and hardware for the efficient execution of telecommunication protocols. The proposed architecture is based on a high-performance RISC core, which is extended with reconfigurable, pipelined hardware. Additionally, we discuss the application spectrum of the proposed NP and describe a statefull-inspection application for an IP-firewall system. To identify time-critical operations, CPU-consuming functions and the common execution path pertaining to the statefull-inspection application, extensive protocol profiling has been performed resulting in an efficient SW/HW partitioning of the application on the proposed NP platform. The analysis performed concludes that the described protocol processor can sustain demanding protocol processing up to the transport layer for multiple Gbits/sec of incoming network traffic.","PeriodicalId":398555,"journal":{"name":"2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120934905","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}

{"title":"On the performance gains of TCP with ECN","authors":"K. Pentikousis, H. Badr, Bilal Kharmah","doi":"10.1109/ECUMN.2002.1002092","DOIUrl":"https://doi.org/10.1109/ECUMN.2002.1002092","url":null,"abstract":"We study the effect of explicit congestion notification (ECN) on TCP performance for large file transfers and compare it with other congestion avoidance mechanisms, namely drop tail and RED. In contrast to previous work, we focus on situations in which all nodes in the network operate uniformly under the same mechanism (DT or RED or ECN). We observe no significant improvement in TCP goodput when ECN is supported. On the other hand, our results show that with ECN, TCP flows benefit from lower overhead for unsuccessful transmissions, and lockouts are largely avoided.","PeriodicalId":398555,"journal":{"name":"2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132911227","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}

{"title":"Resources control and QoS implementation in a NGN DSL access network","authors":"M. Vautier, G. Fromentoux, X. Hartrisse, R. Vinel","doi":"10.1109/ECUMN.2002.1002119","DOIUrl":"https://doi.org/10.1109/ECUMN.2002.1002119","url":null,"abstract":"This paper addresses the QoS and resources reservation issues in a NGN DSL access network to deliver IP services to end-users. A general framework for designing NGN architectures is first presented with the introduction of roles, processes and sessions. This helps to identify functions needed for a NGN DSL access network that supports a wide variety of services. Thanks to this model, we present two different approaches to control resources in the access network: static and dynamic. This is illustrated in the case of a DSL access network. The last part of the paper deals with resources in the transfer plane, where two scenarios to deliver different types of services to the end user using a DSL network are presented. These services are real time services, like multimedia or voice services, and non real time services, such as regular Internet data services.","PeriodicalId":398555,"journal":{"name":"2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133070407","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}

{"title":"An analysis of architecture of videoconferencing system based on concept of active network","authors":"R. Chodorek","doi":"10.1109/ECUMN.2002.1002102","DOIUrl":"https://doi.org/10.1109/ECUMN.2002.1002102","url":null,"abstract":"Guaranteed QoS transmission can be performed using signalling reservation protocols, as RSVP. In some situations, if (due to limited network resources) reservation is difficult or impossible, a change of transmitted traffic parameters will be necessary. The RTP protocol recommendation permits translation mechanisms to change transmitted stream parameters on the local network boundary. RTP transcoders adaptively change parameters of the stream based on current network state and end-user requirements. In the paper the architecture of videoconferencing systems with integrated end-to-end QoS management is presented. The proposed QoS management is based on distributed measurements carried out by mobile agents and consists of, between others, a set of transcoding agents located in the network nodes.","PeriodicalId":398555,"journal":{"name":"2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134128935","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}

{"title":"Resolution of a WDM network design problem using a decomposition approach and a size reduction method","authors":"J. Kuri, N. Puech, M. Gagnaire","doi":"10.1109/ECUMN.2002.1002105","DOIUrl":"https://doi.org/10.1109/ECUMN.2002.1002105","url":null,"abstract":"Multicommodity flow models have been proposed in the literature to formulate different network design problems as mixed integer linear programming (MILP) problems. The formulations axe important because there are algorithms that find the optimal solution to these problems. However, MILP problems are NP-hard, which makes the solution of design problem instances of non trivial size numerically intractable. In this article we propose a method to tackle the inherent complexity of a WDM network design problem formulated as a multicommodity flow problem. The method allows us to solve WDM network design problems of medium size. We first decompose the design problem into two subproblems that can be solved separately. Multicommodity flow models are used to formulate each subproblem as a MILP problem. We then prune the variables' space associated to each subproblem by eliminating from the formulation useless variables. The solution to the design problem is obtained by solving the subproblems sequentially. To take into account the dependency between subproblems, we introduce a feedback mechanism to exchange information between the algorithms that solve the subproblems.","PeriodicalId":398555,"journal":{"name":"2nd European Conference on Universal Multiservice Networks. ECUMN'2001 (Cat. No.02EX563)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123519427","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}