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Measuring DNS services at APNIC A work-in-progress report

Measuring DNS services at APNIC A work-in-progress report. Reverse DNS SIG APRICOT, Bangkok 5 March 2002. Overview. Motivations Methodology Initial outcomes Future work Questions. Motivations. Improve APNIC reporting function EC response to member survey

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Measuring DNS services at APNIC A work-in-progress report

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  1. Measuring DNS services at APNICA work-in-progress report Reverse DNS SIG APRICOT, Bangkok 5 March 2002

  2. Overview • Motivations • Methodology • Initial outcomes • Future work • Questions

  3. Motivations • Improve APNIC reporting function • EC response to member survey • Strategic regional/national relevancy • DNS traffic reflects end-user usage • DNS efficiencies affect global service quality • Improve monitoring of APNIC services • Check load balance between servers, locations • Early warning of problems • Review load balance when network changes, new services added

  4. Methodology • APNIC DNS nameservers sampled every 15 minutes • currently approx 8-10Mb named.run • dumps saved as compressed images for future use # ndc debug;sleep 60; ndc nodebug

  5. Methodology cont. • Analyse sample • Requestors • Source of datagrams • Requested objects • .in-addr.arpa • .ip6.int, etc • Collate using RIR allocation maps • Tag data by ISO CC of nearest allocation boundary • Can sort by volume of requests, CC etc.

  6. RIR Map Issues • Network licenceholders can use the network anywhere • CC of allocation/assignment record • Not authoritative source CC of request. • 80:20 rule on likely location of network? • Many legacy networks list as US but are located worldwide • Too many addresses unknown CC

  7. Initial Outcomes • Example load shares • To Brisbane and Tokyo • CN/TW • ID/HK • NZ/KR • Query rates • 2 week sample • IPv6 query rate • Top 10 requesting CC by server location

  8. CN,TW serve by server location

  9. ID,HK serveby server location

  10. NZ, KR serveby server location

  11. DNS server query rate

  12. IPv6 requests

  13. Top 20 requesting CC by server location Australia Japan

  14. Future Work • Table of CC to requested DNS RR • More computationally expensive • May not be completely accurate • Web ‘select-your-own-CC’ interface • Apply same methodology • Web • Whois • requester,requested-data inline in logfiles, so much simpler to tabulate • Consistent methodology for monitoring APNIC resource usage

  15. Future Work cont. • Account for measurement-induced errors • Additional cost to DNS server to write named.run file • Is named logging ‘cheaper’ ? • Avoid methods which query (www,whois,dns) • Improve methodology • Use DNS logging not debug dumps • Make data available online • APNIC values interpretation of raw data by the wider community

  16. Questions George Michaelson ggm@apnic.net

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