01319nas a2200145   4500008004100000245004600041210004500087260001800132300001500150520084000165100002101005700001901026700002201045856010601067       2007                        eng d00aEnhancing ns-2 with DiffServ QoS features0 aEnhancing ns2 with DiffServ QoS features  c25 - 29 March  a 117 - 1243 aIn this paper, we present work that we have carried out in extending the ns-2 simulator in order to study and validate Quality of Service issues and related architectures. In the case of the DiffServ framework, simulation is valuable since an analytical approach of mechanisms and services is infeasible due to the aggregation and multiplexing of flows. This paper covers work in extending ns-2 functionality towards the direction of realistic traffic generation and a series of mechanisms defined by the DiffServ architecture. We have also extended ns-2 with the functionality of Bandwidth Brokers, which are entities for managing the resources and negotiating end to end resource reservations between domains. The Bandwidth Broker ns-2 implementation is useful for studying the related architectures and admission control procedures.1 aBouras, Christos1 aStamos, Kostas1 aPrimpas, Dimitris  uhttp://telematics.upatras.gr/telematics/publications/enhancing-ns-2-diffserv-qos-features?language=en