DNS Measurements at the .CN TLD Servers

摘要

The Domain Name System (DNS) is a fundamental Internetȁ9;s infrastructure. There have been several studies on DNS measurements such as server workload and deployment characteristics. In this paper, based on the traffic collection spanning a two days period, we present a detailed study of the key characteristics of the . CN Top Level Domain (TLD) name servers which are located at eight different sites. Results demonstrate that properties of these geographically distributed servers vary a lot in terms of traffic load, client population as well as their temporal and spatial patterns. As the Country Code TLD (ccTLD) for China, only 9% of clients are from domestic, which contribute to nearly 50% of all queries received by these servers. Besides, the validity of queries is also evaluated, which turn out to be better than that of the root servers.