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Nowadays many new technologies are being developed and introduced for Internet, home networks, and sensor networks. The new technologies must be evaluated in detail before deployment. However the above mentioned networks have a large number of nodes and a complicated topology. Therefore it is difficult to analyze such networks using typical network(More)
To sustain a large-scale overlay network, knowledge about network characteristics is indispensable. However, the collection of such information is often a burden on the developers: why should they struggle to obtain the information even though it is not their intended purpose? As one solution to this problem, this paper presents N-TAP, a distributed(More)
Social networks that are built on top of the web, e.g., orkut [9], have been proliferating among online communities. We propose social inter-networks, where essential functions of social networks are implemented on top of peer-to-peer networks. Participants and communities are connected through attribute queries and reputation queries; reputation queries(More)
The Internet is a complex collection of various nodes which run independently. The hardware and software of nodes are quite diverse and these elements make the complexity of the Internet. It is difficult to model these behaviors, so we proposed and implemented StarBED, a large-scale testbed using general PCs and switches. Thus we created an environment for(More)
The importance of large-scale measurement infrastructures for grasping the global state of the Internet is recently strongly emphasized. However , a fundamental analysis of these infrastructures has not yet been conducted. In this paper, we highlight the formation of measurement networks and provide a first look at measurement activities performed on those(More)
The variety of Quality of Service (QoS) requirements from applications is increasing and overlay networks are spreading widely. Because of this, a means of flexibly supporting various applications, including overlay network applications, must be devised. In this paper, we describe an inter-ISP virtual backbone infrastructure designed to flexibly meet(More)
In P2P file sharing, problems can occur due to harmful content distributed by malicious peers and many solutions using reputation management have been proposed. However, none of these solutions are effective in relay-transfer P2P file sharing where a peer automatically relays content and creates content caches. This is because all the existing solutions(More)
The eXplicit Control Protocol (XCP), which explicitly sends feedback information on the current network resource condition to end-hosts to control congestion, is a promising protocol for the network supported congestion control that will be needed in the future Internet. Because of its flexibility, XCP can provide relative bandwidth allocation service that(More)