This paper presents a Xen virtualization-based testbed for wired and wireless networks. Although big test infrastructures have been developed by research groups around the world, smaller testbeds can also be interesting, especially for the first stages of deployment of new systems and protocols. It is a hybrid testbed, as it includes simulation and emulation tools. But there exists a previous offline simulation stage, in order to avoid computer load, which could limit the maximum number of hosts to be included into the scenario. Two uses of the testbed are presented, one for wireless networks which deploys some handover measures with MIPv4, and the first tests of a distributed Call Admission Control (CAC) for an IP Telephony system. The uses show that measurements obtained with our testbed are similar to the ones published by other groups using real machines. 1
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