Studying Global DNS Performance for ENUM Protocol

ENUM (Electronic NUMbering) is a new protocol designed to translate numbers into information by using the DNS (Domain Name System) architecture. Its success will depend on whether the DNS can achieve a performance similar to the database used in the current classical voice s ervices. The paper(1) shows different causes influencing the retrieval time of a World Wide Object. Of all the differen t factors, the DRD (DNS Resolution Delay) is the only one metric that cannot benefit from the lower Round Trip T ime and loss rate in current networks. Another article(2) shows the different factors causing this DRD. In order to study their influences we measure and model each of these parameters. We had to develop tools (active measurement) to measure the performance of a local DNS server and an Internet link. We analyzed and modeled the data sets we obtained. By this process parameters of the mathematical model were calculated. We then created a simulation model which enables us to simulate the global DRD for ENUM in different scenario by varying each parameter one by one. This will lead to recommendations for the new ENUM Protocol to achieve the best performance. First, we will present an overview of the ENUM protocol/technology. Then we will explain why DRD matters for the success of ENUM and the parameters that can decrease the DNS performance. In the third section we will briefly present the methods we used to measure both the local p erformance of a DNS server and the performance of a link. Before concluding, in the fourth section we will ex plain the modules we have developed for the NS-2 simulator in order to study the global performance of the DNS with ENUM.