The Globus Toolkit® (GT) is the “de facto standard” for grid computing. Measuring the performance of various components of the GT in a wide area network (WAN) as well as a local area network (LAN) is essential in understanding the performance that is to be expected from the GT in a realistic deployment in a distributed and heterogeneous environment where there might be complex interactions betw...

Practical experiments in a satellite network environment assist in the design and understanding of future global networks. This paper describes the practical experiences gained from TCP/IP on ATM networks over a high speed satellite link and presents performance comparison studies of such networks with the same host/traac conngurations over local area (LAN) and wide area (WAN) networks. These c...

Recently, the Guaranteed Frame Rate (GFR) service category has been proposed to provide bandwidth guarantees with a simpler implementation than ABR in ATM networks. In this paper, we study the performance of TCP in LAN and WAN ATM networks supporting the GFR service category. We present simulations where each TCP connection is carried by one GFR VC with a minimum guaranteed bandwidth. We consid...

The Globus Toolkit® (GT) is the “de facto standard” for grid computing. Measuring the performance of various components of the GT in a wide area network (WAN) as well as a local area network (LAN) is essential in understanding the performance that is to be expected from the GT in a realistic deployment in a distributed and heterogeneous environment where there might be complex interactions betw...

Building an up-do-date information technology (IT) infrastructure is one of the key issues in supporting both the technological and the economical advancement of developing countries. Several concepts promise to meet the special requirements arising, when applying them to the telecommunication infrastructure of these countries. With its ability to be applied to an existing copper-based public s...

H.323 is a relatively new standard for video and voice transmission that specifies using IP packets as the transport. This opens the possibility of adding an inexpensive camera to a modern desktop, and allowing two way video-conferencing between any offices so equipped. While the H.323 specification addresses LAN networks, can H.323 be used in a WAN environment? What characteristics are necessa...

In this paper, we propose a modified TCP-NewReno in LAN/WAN with a lossy link such as wireless network and ATM network, where packet loss occurs because of unreliable data link layer or imperfect physical transport layer. Much research has show that the scheme of TCP-NewReno or the scheme of reducing fast-retransmit threshold can effectively improve the TCP performance in lossy networks. Howeve...

Wide Area Networks have different performance characteristics compared with Local Area Networks. Their throughput is usually lower and there is a greater chance of information being dropped, damaged or delayed. Furthermore software that is developed for dependable applications over wide area networks may frequently be tested in a LAN environment where it is difficult to reproduce the characteri...

ATM has been successfully used in Wide Area Networks (WAN) and Local Area Networks (LAN). A possible next step in this evolution is to use ATM for memory interconnect. This paper discusses how ATM can fulfill the functional and performance requirements in a memory interconnect, and the implications this will have for external ATM communication. We conclude that ATM can be used as a memory inter...

This paper describes the use of a parallel discrete-event network emulator called the Internet Protocol Traffic and Network Emulator (IP-TNE) for Web server benchmarking. The experiments in this paper demonstrate the feasibility of highperformance WAN emulation using parallel discrete-event simulation techniques on a single shared-memory multiprocessor. Our experiments with an Apache Web server...