Netzwerkmanagement und Hochleistungskommunikation. Teil XXIV. Seminar SS 2001

This Technical Report includes student papers produced within a seminar of "Network Management and High Performance Communications". For the 24nd time this seminar has attracted a large number of diligent students, proving the broad interest in topics of network management and high performance ommunications. The topics of this report may be coarsely divided into two blocks: One block is devoted to high speed and high performance technology. At first, the concept of modern High Speed Switches and Routers with quality-of-service support is described. Subsequently, Efficient Methods and Algorithms for Routing Table Lookups as well as Classification of IP Packets and multiprotocol Label Switching (MPLS) are presented. A second block deals with various topics such as wireless communications, network management and security. The first article shows advantages of the Policy-based Networks to manage todays networks. Furthermore, Security Extensions of DNS for secure use of the domain name service are examined and presented. The next article describes how to use mobility profiles in mobile ad-hoc networks. Methods for watermarking of multimedia data are discussed in a subsequent article. Moreover, Technical Challenges and Solutions for IP-telephony are also presented, whereby the Stream Control Transmission Protocol is described separately as an approach to achieve a better transport of signaling messages over the Internet. The last article deals with group communication and shows New Approaches for Multicast Routing as well as an overview of some Multicast transport protocols

A platform for lab exercises in sensor networks

Abstract. Programming of and experiences with sensor network nodes are about to enter the curricula of technical universities. Often however, practical obstacles complicate the implementation of a didactic concept. In this paper we present our approach that uses a Java virtual machine to decouple experiments with algorithm and protocol concepts from the odds of embedded system programming. This concept enables students to load Java classes via an SD-card into a sensor node. An LC display provides detailed information if the program aborts due to bugs.

Using Bluetooth for Informationally Enhanced Environments Abstract

The continued miniaturization in computing and wireless communication is about to make informationally enhanced environments become a reality. Already today, devices like a notebook computer or a personal digital assistent (PDA) can easily connect to the Internet via IEEE 802.11 networks (WaveLAN) or similar technologies provided at so-called hot-spots. In the near future, even smaller devices can join a wireless network to exchange status information or send and receive commands. In this paper, we present sample uses of a generic Bluetooth component that we have developed and that has been successfully integrated into various mininature devices to transmit sensor data or exchange control commands. The use of standard protocols like TCP/IP, Obex, and HTTP simplifies the use of those devices with conventional devices (notebook, PDA, cell-phone) without even requiring special drivers or applications for these devices. While such scenarios have already often been dreamt of, we are able to present a working solution based on small and cost-effective standard elements. We describe two applications that illustrate the power this approach in the broad area of e-commerce, e-learning, and e-government: the BlueWand, a small, pen-like device that can control Bluetooth devices in its vincinity by simple gestures, and a door plate that can display messages that are posted to it e.g. by a Bluetooth PDA. Keywords: Human-Computer Interaction, Ubiquitous Computing, Wireless Communications (Bluetooth)

Hardware support for RSVP capable routing

Todays FPGA technology allows recon gurable hardware to be integrated into standard PC hardware as well as into dedicated router systems. With a hardware like this it is possible to oer support for CPU intense parts of the forwarding process within a router. With upcoming services like RSVP [3] additional demands is put on processing power within routers. This paper presents an implementation of several aspects of RSVP state handling in hardware in order to releaf the router or interface CPU some aspects of RSVP processing. Special focus is on RSVP table maintenance. The RSVP implementation uses the happlet (hardware applet) concept from [6] to interface between the hardware based routines and the system kernel and user-space programs

Network Services for the Support of Very-Low-Resource Devices

Abstract—Visions of future computing scenarios envisage a multitude of very-low-resource devices linked by power-efficient wireless communication means. This paper presents our vision of such a scenario. From this vision requirements are derived for an infrastructure that is able to satisfy the largely differing needs of these devices. The paper also shows how innovative, collaborating applications between distributed sensors and actuators can arise from such an infrastructure. The realization of such innovative applications is illustrated with two examples of straightforward services that have been implemented with the AMnet infrastructure that is currently being developed in the FlexiNet project. Additionally, first performance measurements for one of these services are given. Index terms — Bluetooth, Programmable networks, Sensoractuator network

AMnet: Heterogeneous Multicast Services based on Active Networking

AMnet flexibly provides communication services inside the network. It is based on active networking and on a hardware/software co-design in order to improve efficiency. Group communication is explicitly addressed since it is an important paradigm for existing and emerging networked applications. The goal of the AMnet approach is the provision of scalable quality-based support for heterogeneous group communication. It uses so-called service modules for efficient and flexible service support within intermediate systems. This paper gives an overview of AMnet. The design of an AMnode as an active intermediate system with hardware-supported service capabilities is presented. Furthermore, a simple control and signalling suite for heterogeneous multicast services is proposed. Keywords---Active Multicasting, Heterogeneous Group Communication, Adaptive Error Control I. INTRODUCTION Within the current Internet all systems interact via a handful of well-defined general purpose communication p..

Results on the practical feasibility of programmable network services

Abstract—Active and programmable networks have been subject to intensive and successful research activities during the last couple of years. Many ideas and concepts have been pursued. However, only a few prototype implementations that have been developed so far, can deal with different applications in a larger scale setting. Moreover, detailed performance analyses of such prototypes are greatly missing today. Therefore, this paper does not present yet another architecture for active and programmable networks. In contrast, it rather focuses on the performance evaluation of the so-called AMnet approach that has already been presented previously [1]. As such, the paper demonstrates that an operational high-performance programmable network system with AAA (authentication, authorization, and accounting) security functionality will in fact be feasible in the near future. I