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Comprehensive DNS Server Monitoring Tool - dnsmon

dnsmon is an independent and objective tool to monitor DNS servers globally. It provides novel and interactive presentations to help users understand the quality of service offered by servers serving a domain. With measurements from multiple probe locations and real DNS queries, dnsmon offers insightful data for better monitoring. For detailed information, visit http://www.ripe.net/ripe/docs/dnsmon.html.

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Comprehensive DNS Server Monitoring Tool - dnsmon

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  1. dnsmonDNS Server Monitoring Daniel Karrenberg <daniel.karrenberg@ripe.net>

  2. dnsmon • Monitor DNS servers from many places • Independent and Objective • Novel and Interactive Presentation

  3. Why Measure This Way? • There are lots of bad measurements out there! • Ping - what does it measure?? • From single locations … • People (press, regulators) use them! • Better Measurements are Needed • From multiple points • Real DNS traffic

  4. Single Point Measurement

  5. In Context

  6. In Context

  7. How to Read the Graphs • Server View • shows quality of service provided by the server to all probes • Domain View • summarises quality of service provided by all servers serving a domain • (Probe View) • shows quality of service provided by all servers at a particular probe location

  8. dnsmon Probe Locations

  9. dnsmon Probe Locations

  10. What is Measured • Real DNS queries • Poisson distributed, ~60/hour/server/probe • From 60+ probes around the world • Response time • Server instance ID (anycast, load balancing) • SOA version number • Server software version

  11. What is Not Measured • DNS queries used in actual name resolution • Total DNS service quality, e.g. ‘user experience’ • global service quality: 60+ points, RIPE region bias • Effects that last less than about a minute But still very comprehensive measurements!

  12. Some More Examples

  13. Service Description http://www.ripe.net/ ripe/docs/dnsmon.html • Service Description • Information on how to obtain service

  14. http://dnsmon.ripe.net<daniel.karrenberg@ripe.net>

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