QoS in Today's Internet

To be able to guarantee service quality end-to-end Quality of Service has to be deployed. This thesis addresses the problems with applying QoS end-to-end over today’s Internet. A rather pessimistic conclusion states that QoS over Internet is hard (impossible?) to realize without introducing virtual circuits or similar. The concept of flows and label switching is introduced. Some QoS techniques are presented

Analysis of BGP4 Peering Establishment Time on IPv6 Connection over 6PE and 6VPE

Nowadays, because of the exhaustion of IPv4 address space, IPv6 is increasingly being used on enterprise networks. Usually, an enterprise uses an MPLS network from a Service Provider to interconnect their IPv4 network sites. Although MPLS Service Providers mostly built their MPLS backbone based on IPv4, their MPLS backbone have the capability to transport IPv6 traffic of their customers. Two methods can be used by the MPLS Service Provider to connect its customer IPv6 network, which is 6PE (IPv6 Provider Edge Routers) and 6VPE (IPv6 VPN Provider Edge Router). Enterprises generally use a BGP routing protocol to interconnect their networks, and they need to use the best method that suits their requirement from their MPLS Service Provider to transport their IPv6 traffic (including the BGP protocol). The MPLS Service Providers need to consider the advantages and disadvantages of both methods. This paper illustrates the analysis of BGP4 (current BGP version) IPv6 peering establishment time over 6PE and 6VPE methods. The MPLS Service Providers can use the analysis results of this study to determine the suited method to interconnect its customers' IPv6 networks

IP and ATM integration: A New paradigm in multi-service internetworking

ATM is a widespread technology adopted by many to support advanced data communication, in particular efficient Internet services provision. The expected challenges of multimedia communication together with the increasing massive utilization of IP-based applications urgently require redesign of networking solutions in terms of both new functionalities and enhanced performance. However, the networking context is affected by so many changes, and to some extent chaotic growth, that any approach based on a structured and complex top-down architecture is unlikely to be applicable. Instead, an approach based on finding out the best match between realistic service requirements and the pragmatic, intelligent use of technical opportunities made available by the product market seems more appropriate. By following this approach, innovations and improvements can be introduced at different times, not necessarily complying with each other according to a coherent overall design. With the aim of pursuing feasible innovations in the different networking aspects, we look at both IP and ATM internetworking in order to investigating a few of the most crucial topics/ issues related to the IP and ATM integration perspective. This research would also address various means of internetworking the Internet Protocol (IP) and Asynchronous Transfer Mode (ATM) with an objective of identifying the best possible means of delivering Quality of Service (QoS) requirements for multi-service applications, exploiting the meritorious features that IP and ATM have to offer. Although IP and ATM often have been viewed as competitors, their complementary strengths and limitations from a natural alliance that combines the best aspects of both the technologies. For instance, one limitation of ATM networks has been the relatively large gap between the speed of the network paths and the control operations needed to configure those data paths to meet changing user needs. IP\u27s greatest strength, on the other hand, is the inherent flexibility and its capacity to adapt rapidly to changing conditions. These complementary strengths and limitations make it natural to combine IP with ATM to obtain the best that each has to offer. Over time many models and architectures have evolved for IP/ATM internetworking and they have impacted the fundamental thinking in internetworking IP and ATM. These technologies, architectures, models and implementations will be reviewed in greater detail in addressing possible issues in integrating these architectures s in a multi-service, enterprise network. The objective being to make recommendations as to the best means of interworking the two in exploiting the salient features of one another to provide a faster, reliable, scalable, robust, QoS aware network in the most economical manner. How IP will be carried over ATM when a commercial worldwide ATM network is deployed is not addressed and the details of such a network still remain in a state of flux to specify anything concrete. Our research findings culminated with a strong recommendation that the best model to adopt, in light of the impending integrated service requirements of future multi-service environments, is an ATM core with IP at the edges to realize the best of both technologies in delivering QoS guarantees in a seamless manner to any node in the enterprise

Netzwerkmanagement und Hochleistungskommunikation. Teil XXII. Seminar SS 2000

Zusammenfassung Der vorliegende interne Bericht enthält die Beiträge zum Seminar "`Netzwerkmanagement und Hochleistungskommunikation"\u27, das im Sommersemester 2000 zum 22. Mal stattgefunden hat. Die Themenauswahl kann grob in folgende drei Blöcke gegliedert werden: enumerate Ein Block ist der Hochgeschwindigkeits-Technologie gewidmet. Im ersten Beitrag wird das Konzepts des Multiprotocol Label Switchings (MPLS) vorgestellt, welches gegenüber herkömmlichem Routing einen Geschwindigkeitsvorteil im Bereich einer Größenordnung mit sich bringt. Der zweite Beitrag beschreibt effiziente Verfahren und Algorithmen zur Klassifikation von IP-Paketen, welche bei ständig zunehmender Geschwindigkeit der Router zunehmend an Bedeutung gewinnen. Der dritte Beitrag behandelt Varianten des Transmission Control Protocols TCP, dessen Mechanismen für höhere Leistung oder mobile Einsatzszenarien erweitert werden müssen. Ein zweiter Block beschäftigt sich mit verschiedenen Themen aus den Bereichen drahtlose Kommunikation, Netzwerkmanagement und Sicherheit. Hier wird zum einen die Protokoll-Architektur des Wireless Application Protocols (WAP) vorgestellt, welches die speziellen Anforderungen mobiler Teilnehmer mit kleinsten drahtlos angebundenen Endgeräten, beispielsweise Mobiltelefonen, in Bezug auf die Internet- bzw. Datenkommunikation berücksichtigt. Zum anderen wird im Beitrag zur automatischen Netzwerk-Konfiguration auf ein im Zeitalter der ständig wachsenden Netze zunehmend wichtiges Netzwerkmanagement-Thema eingegangen. Schließlich werden im dritten Thema Zero-Knowledge-Protokolle, elegante Verfahren zur Authentisierung, vorgestellt, welche etwa im Bereich des elektronischen Zahlungsverkehrs eingesetzt werden können. Der dritte Block umfasst den Themenbereich der Gruppenkommunikation. Hier werden einerseits neuere Ansätze zum Multicast-Routing beschrieben und andererseits eine Auswahl der funktional darüber angeordneten, zahlrei chen Multicast-Transportprotokolle. enumerate Abstract This Technical Report includes student papers produced within a seminar of `Network Management and High Performance Communications\u27. For the 22nd time this seminar has attracted a largenumber of diligent students, proving the broad interest in topics of network management and high performance communications. The topics of this report may be divided into three blocks: enumerate One block is devoted to high speed and high performance technology. At first, the concept of Multiprotocol Label Switchings (MPLS) is described. Subsequently, Efficient Methods and Algorithms for Classification of IP Packets and Variants of TCP are presented. A second block deals with various topics such as wireless communications, network management and security. The first article shows advantages of the Wireless Application Protocol (WAP) to access Internet information in mobile environments. The second article describes Automatic Network Configuration Mechanisms which are of increasing importance. Third, Zero Knowledge Protocols for secure authentication are examined and presented. The third block deals with group communication and shows New Approaches for Multicast Routing as well as an overview of some Multicast Transport Protocols