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The workload of the global Internet is dominated by the Hypertext Transfer Protocol (HTTP), an application protocol used by World Wide Web clients and servers. Simulation studies of IP networks will require a model of the traSJic putterns of the World Wide Web, in order to investigate the effects of this increasingly popular application. We have developed(More)
— Tools such as pathchar, clink, and pchar attempt to measure the capacity of every Layer-3 (L3) hop in a network path. These tools use the same underlying measurement methodology, which we refer to as Variable Packet Size (VPS) probing. The key assumption in VPS is that each L3 hop along a path increases the delay of a packet by a " serialization latency "(More)
Mobile computers using wireless networks, along with multimedia applications, are two emerging trends in computer systems. This new mobile multimedia computing environment presents many challenges, due to the requirements of multimedia applications and the mobile nature of hosts. We present several alternative schemes for maintaining network connections(More)
Many future applications will require guarantees on network performance, such as bounds on throughput, delay, delay jitter, and reliability. To address this need, we have designed, simulated , and implemented a suite of network protocols to support real-time channels (network connections with mathematically provable performance guarantees). The protocols,(More)
In this report, we present measurements of IP multicast traffic taken at the University of California at Berkeley. We note that the volume and distribution of IP multicast traffic is highly variable, and can depend on a small number of active conversations. From examining many-way multimedia conferences, we note the need for some kind of conference control,(More)
Starting from Jacobson's pathchar [1], there has been a significant interest in techniques that can measure the link capacities , a.k.a, link rates, of an IP path. Follow-up research papers and variations ofpathchar are Downey's clink [2], Mah's pchar [3], and Lai's tailgating technique in nettimer [4]. The motivation for such per-hop capacity estimation(More)
A common shortcoming of many network measurement programs is that their metrics are not expressed in terms directly applicable to applications and users. To address this problem, we have developed the IP Benchmark (IPB), a benchmark program that synthetically generates traffic to simulate the network activity of common Internet applications. It measures the(More)