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Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

In this paper we present a troubleshooting tool designed to identify a number of DNS configuration errors. These errors range from commonly seen misconfigurations that are well known among DNS operators, such as lame delegations, to less known ones, such as cyclic zone dependencies. Left unnoticed, these misconfigurations can seriously affect the availability of the DNS infrastructure. Instead of explicitly enumerating all possible configuration errors, we first identify two essential properties that characterize a correct DNS configuration, and detect misconfigurations as violations of these properties. We also utilize multiple monitoring points to identify configuration errors that are difficult or impossible to pin down with a single vantage point. Furthermore, equipped with a comprehensive graphical user interface, our tool provides network operators with a tangible view of their DNS zones' configuration and the errors that may affect their availability.