XMILE:An XML-based approach for programmable networks

In this paper we describe an XML-based platform for dynamic active node policy updates. XML supports the definitionof specific policy languages, their extension to satisfy new needs and the management of deployed policies on differentactive nodes. We show an example of the management of router packet forwarding policies where the XML policiesthat drive the packet routing are updated at run-time on the active nodes depending on the network status. The platformdecouples policy management, which is handled through XML interpretation, from packet forwarding that, forperformance reasons has to be implemented in more efficient languages

A Survey of Active Networks

Active networks represent a significant step in the evolution of packet-switched networks, from traditional packet-forwarding engines to more general functionality supporting dynamic control and modification of network behavior. However, the phrase ^\active network^] means different things to different people. This survey introduces a model and nomenclature for talking about active networks, describes some possible approaches in terms of that nomenclature, and presents various aspects of the architecture being developed in the DARPA-funded active networks program. Also, a snapshot of the current research issues and activities of different institutions is provided. Potential applications of active networks are highlighted, along with some of the challenges that must be overcome to make them reality

Mechanisms and protocols for intermediate processing at routers in the Internet

The Internet consists of a number of interconnected networks supporting communication among host computers using the Internet protocols. One of the most important constituents of the Internet is an IP router or a gateway. A router is connected to two or more networks, appearing to each of these networks as a connected host. If the processing capability of a router is further enhanced to support computation on parts of data contained in a datagram, some of the end host computation can be delegated to the routers that the data passes through. The instructions about how to do the processing itself could be provided by the end. This thesis defines a reliable transport layer protocol, Intermediate Processing Protocol (IPP), which is a set of rules and guidelines for processing within the Internet. The protocol design addresses provision for connection set up handshake, acknowledgement of data received, router reservation policy, intermediate processing, buffering and retransmission of data, flow control, congestion control, ordered delivery of data and security issues

A survey of network virtualization

a b s t r a c t Due to the existence of multiple stakeholders with conflicting goals and policies, alterations to the existing Internet architecture are now limited to simple incremental updates; deployment of any new, radically different technology is next to impossible. To fend off this ossification, network virtualization has been propounded as a diversifying attribute of the future inter-networking paradigm. By introducing a plurality of heterogeneous network architectures cohabiting on a shared physical substrate, network virtualization promotes innovations and diversified applications. In this paper, we survey the existing technologies and a wide array of past and state-of-the-art projects on network virtualization followed by a discussion of major challenges in this area

Network management using active networks

EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Location aware advertisement insertion for mobile network video streams

Mobile phone networks are on the verge of a major breakthrough in terms of the services they offer. At the same time, active networks are being presented as the next step in the evolution of network architecture, with the aim of providing greater functionality within the network but retaining flexibility. At the same time, the 3G revolution seems to be floundering, due to the need to make a financial return on the huge investment tied up in the licences. This thesis seeks to provide a way forward, by investigating the implementation of a novel service that is the provision of video streaming across the mobile network with location dependent advertisement insertion. The work retains flexibility within the network architecture to enable additional services to be evolved and implemented with minimal modification to the nodes. The approach taken is to combine the traditional architecture with active functionality. As a result this thesis describes a novel service, the implementation of a short video service with location dependent advertisement insertion. This enables the provider to generate an income by transporting the service (it is possible for a third party to generate the content instead of the network provider) and by selling the advertisement space. This thesis investigates the implementation issues involved in providing the service and presents a protocol for the operation of it. The impact of this service on other users is also studied with the conclusion being that it does not adversely effect the quality of service of the voice traff ic within the network. In order to investigate the implementation of the protocol, a simulation model was constructed in OPNET [42]. This enabled the operation of the protocol to be tested under artificial conditions using fixed movements, to verify that it operated as specified. Then under more realistic conditions, so as to predict its effect on the other traffic in the network

Identity Management and Resource Allocation in the Network Virtualization Environment

Due to the existence of multiple stakeholders with conflicting goals and policies, alterations to the existing Internet architecture are now limited to simple incremental updates; deployment of any new, radically different technology is next to impossible. To fend off this ossification, network virtualization has been propounded as a diversifying attribute of the future inter-networking paradigm. In this talk, we provide an overview of the network virtualization environment (NVE) and address two basic problems in this emerging field of networking research. The identity management problem is primarily concerned with ensuring interoperability across heterogeneous identifier spaces for locating and identifying end hosts in different virtual networks. We describe the architectural and the functional components of a novel identity management framework (iMark) that enables end-to-end connectivity across heterogeneous virtual networks in the NVE without revoking their autonomy. The virtual network embedding problem deals with the mapping of virtual nodes and links onto physical network resources. We argue that the separation of the node mapping and the link mapping phases in the existing algorithms considerably reduces the solution space and degrades embedding quality. We propose coordinated node and link mapping to devise two algorithms (D-ViNE and R-ViNE) for the online version of the problem under realistic assumptions and compare their performance with the existing heuristics

Architektur vernetzter Systeme. Seminar SS 2001

Der Interne Bericht enthaelt die Beitraege zum Seminar "Architektur vernetzter Systeme" des Instituts für Telematik, welches seit 2000 von Mitarbeitern der Forschungsgruppe "Dezentrale Systeme und Netzdienste" von Prof. Dr. L. Wolf durchgefuehrt wird. Die Themenauswahl kann in drei Bloecke gegliedert werden: 1. Zunaechst ist der Bereich der Aktiven Netze zu nennen, in dem seit einigen Jahren an einem ganz neuen Konzept zur Vernetzung von Systemen gearbeitet wird. In aktiven Netzen werden Funktionen durch gesendete Daten ausgefuehrt, im Extremfall werden sogar ganze Programmteile gesendet. In den Beitraegen zu diesem Themenbereich werden Architektur und Anwendungen dieses Konzeptes vorgestellt. 2. Multimedia-Kommunikationsarchitekturen stellen ein weiteres Themengebiet dar. Hier lassen sich ein Beitrag zur Anwendungsentwicklung im multimedialen Bereich sowie ein Ueberblick über die IP-Telefonie einordnen. 3. Den letzten Block bildet ein Beitrag zum Routing in mobilen Ad-hoc-Netzwerken, welche immer noch eine besondere Herausforderung für die Kommunikation darstellen. This technical report includes student papers produced within a course of "Architecture of Distributed Systems" held by members of the research group "Distributed Systems and Net Services" of Prof. Dr. L. Wolf at the Institute of Telematics. The topics of the course can be divided into three groups: 1. Active networking concepts are still quite new to networking in the sense that active elements are carried through the network and processed there. The contributions within this block present architecture and applications of this concept. 2. The second group of papers deal with communication architectures for multimedia applications, especially application development and IP telephony are considered here. 3. Eventually, the challenges of routing in mobile ad-hoc networks are presented in a contribution to the course. The report is written in German