DNS configuration detection model

The domain name system (DNS) plays a crucial role in the Internet. However, DNS configuration errors seriously affect the performance of DNS recently. In order to know current DNS configuration, we have studied and classified common configuration problems, proposed a DNS configuration detection model and detected the top 500 zones of China. The detection results show that DNS configuration errors are widespread. Percentages of misconfigured NS records in the top 500 zones, SOA records and MX records are all over 25%. And more than 25% of the zones do not allow TCP connection. Moreover, percentages of each configuration error class of the zones, such as delegation inconsistency, lame inconsistency and diminished server redundancy are all over 5%, especially delegation inconsistency, which accounts for 28%. Therefore, the DNS configuration is expected to improve to avoid DNS attack.