Abstract. The Internet Engineering Task Force (IETF) is currently working on the development of Differentiated Services (DiffServ). DiffServ seems to be a promising technology for next-generation IP networks supporting Quality-ofServices (QoS). Emerging applications such as IP telephony and time-critical business applications can benefit significantly from the DiffServ approach since the current Internet often can not provide the required QoS. This paper describes an implementation of Differentiated Services for Linux routers and end systems. The implementation is based on the Linux traffic control package and is, therefore, very flexible. It can be used in different network environments as first-hop, boundary or interior router for Differentiated Services. In addition to the implementation architecture, the paper describes performance results demonstrating the usefulness of the DiffServ concept in general and the implementation in particular.
Distributed systems such as peer-to-peer networks and distributed servers can optimize their performance by adapting to the underlying network. End-to-end measurements are an important basis for such adaptivity. Although most applications measure similar properties of the network, the measurements are mostly done in application-specific ways. In this paper we propose a general peer-to-peer measurement service based on clusters of endpoints that show virtually identical QoS properties when observed from outside the cluster. We discuss the clustering concept as well as its use in the measurement service, and we present a measurement-based method for the remote identification of clusters. This method allows for detecting clusters that are not part of the peer-to-peer network. Our evaluation shows that the presented method is able to reliably detect clusters using measurements of round-trip time or of available bandwidth.
The paper describes the concept and the implementation of Differentiated Services over ATM. ATM components are being used in order to implement DiffServ traffic conditioning components such as shaping and policing. The implementation architecture based on a Linux router platform and some initial performance measurement results are presented.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.