Performance Evaluation of ENUM Name Servers

摘要

ENUM is a protocol designed for mapping E.164 telephone numbers into Internet URIs. This protocol imposes new requirements and challenges on traditional DNS servers. In this sense, this paper presents a performance evaluation of ENUM name servers considering these new scenarios. We selected four name servers implementations (BIND, MyDNS-NG, NSD and PowerDNS) to compare their performance, using a benchmarking testbed. To perform the evaluation, we have defined three performance metrics: query throughput, response time, and CPU usage. These metrics required the development of a new procedure for the evaluation, since DNSPerf presented limitations in the management of CPU resources. Prom results, we classified MyDNS-NG as not suitable for ENUM purposes, due to its quite low query throughput and poor scalability. PowerDNS server performed better than MyDNS-NG, but presented high sensibility to database size. On the other hand, BIND and NSD servers achieved a high query throughput with great scalability features. Since we have used extended scenarios and size of database that were not evaluated before, these results bring to light an interesting insight about ENUM servers.