DNS recursive server health evaluation model

The Domain Name System (DNS) is a critical infrastructure in the Internet. DNS recursive servers, as the name servers which interact with the client directly, the health status of them are directly related to integrity and accuracy of resolved data which the user access to. Therefore, how to evaluate the health status of DNS recursive servers has become an urgent problem to be resolved nowadays. In this paper, a DNS recursive server health evaluation model is proposed. We have proposed the metrics for DNS recursive server health, measured the metrics and computed the DNS recursive server health evaluation value based on the results of measuring metrics. In the end, we have evaluated the health of DNS recursive servers of Jiangsu province of China and concluded that the health status still remains to improve on the whole.