Fault tree method for DNS name resolution fault analyse

The domain name system (DNS) is an important part of the internet with core function being to resolve the domain name. The DNS servers must be stable to ensure the availability of the domain name resolution process and accurate resolution results. A domain name resolution fault analysis method is presented in this paper to resolve name resolution problems. Firstly, a name dependency graph is constructed according to the dependency relationship of the name resolution. Then a fault tree analysis is used to mine the DNS servers that give success for name resolution and the DNS servers that fail to give correct results. A single domain name and the Alex Top 50 000 domain names were analyzed using this method to show that there are unreasonable dependencies in the configurations of individual domain names which lead to some unnecessary resolution procedures and increase the DNS server load.