Dynamic Extend Domain Name Server Client Subnet IP Address Aggregation Solution Based On Dynamic Network Information

To make deploying Extend Domain Name Server(EDNS) more economical and thus increase its public adoption rate, this paper proposes a dynamic EDNS client subnet IP address aggregation scheme that can accommodate to real-time network routing information. The local domain name server(LDNS) and the global load balancing system(GSLB) of content delivery network(CDN) only need to cache representative EDNS client subnet entries, so it can significantly reduce the number of cache entries and thus reduce device cache resource consumption after enabling EDNS, which in turn reduces LDNS and CDN construction investment. Furthermore, due to dynamic detection of the network changes, the network information can be synchronized quickly and automatically, which reduces the complexity of configuration management, further improves the accuracy of CDN traffic scheduling.

1 Introduction

Domain name server(DNS) is one of the major Internet infrastructures. Content delivery networks (CDNs) rely on the DNS for replica server selection [1]. Internet services based on Global Traffic Management (GTM) solutions, that use the IP address of the local DNS resolver (LDNS) used by a client as a proxy for the true client identity may have suboptimal performance in some cases. Meanwhile, according to some studies, the accuracy of LDNS mapping will directly affect the service quality of CDN [2] [3].