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dnsmon DNS Server Monitoring

dnsmon DNS Server Monitoring. Daniel Karrenberg <daniel.karrenberg@ripe.net>. dnsmon. Monitor DNS servers from many places Independent and Objective Novel and Interactive Presentation. Why Measure This Way?. There are lots of bad measurements out there! Ping - what does it measure??

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dnsmon DNS Server Monitoring

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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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