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dnsprobe for probing anycast DNS -- Analysis & Future Work -- Yuji Sekiya WIDE Project <sekiya@wide.ad.jp> What is dnsprobe ? dnsprobe is a tool for probing RTT hostname.bind To DNS Server Set Root DNS Servers

  1. dnsprobe for probing anycast DNS -- Analysis & Future Work -- Yuji Sekiya WIDE Project <sekiya@wide.ad.jp>

  2. What is dnsprobe ?  dnsprobe is a tool for probing  RTT  hostname.bind  To DNS Server Set  Root DNS Servers  ccTLD DNS Servers  Active Measurement  Native probe  Dialup probe

  3. Measurement  Started from May 2002  Anycast Probing Started from Jun 2004  Until Jun 2005, over 10,000,000 probes  Target  Root (13 IP addresses)  ccTLD (638 IP addresses)

  4. Motivation  Short span probe from many locations  Using dialup connection  Probes from location which we can't visit easily  How anycast works  Checking hostname.bind  Which anycast instance is answering ?  Measuring RTT  short span probes (1-2 hour at each location)

  5. Probing Result 1105950738 130.69.251.116 eth1 A: rtt 205 ms: hostname ns3-aroot 1105950763 130.69.251.116 eth1 B: rtt 190 ms: hostname b1.isi.edu 1105950715 130.69.251.116 eth1 C: rtt 213 ms: hostname iad1a.c.root-servers.org 1105950756 130.69.251.116 eth1 D: rtt 193 ms: hostname d-root.net.umd.edu 1105950752 130.69.251.116 eth1 E: rtt 199 ms: hostname e2.arc.nasa.gov ﾀ ^U 1105950744 130.69.251.116 eth1 F: rtt 157 ms: hostname lax1b.f.root-servers.org 1105950748 130.69.251.116 eth1 G: timed out (60sec) 1105950720 130.69.251.116 eth1 H: rtt 201 ms: hostname H2 1105950734 130.69.251.116 eth1 I: rtt 1 ms: hostname s1.tok 1105950768 130.69.251.116 eth1 J: rtt 255 ms: hostname jns3-kgtld.j.root-servers.net.j.root- servers.net 1105950773 130.69.251.116 eth1 K: rtt 274 ms: hostname k2.ams-ix 1105950725 130.69.251.116 eth1 L: rtt 257 ms: hostname l2.l.root-servers.org 1105950730 130.69.251.116 eth1 M: rtt 0 ms: hostname M-d3

  6. Anycast Report - C (1) Start : 2004/12/02 End : 2005/01/04 src : 130.69.251.121 (AS2501) dst : 192.33.4.12 20041210 05:59:42 – 20041210 06:56:28 13468 queries 1: iad1a.c.root-servers.org 2: ord1a.c.root-servers.org

  7. Anycast Report - C (2) Start : 2004/12/02 End : 2004/12/03 src : 192.134.1.9 (AS2486) dst : 192.33.4.12 454 queries 1: jfk1b.c.root-servers.org

  8. Anycast Report - C (3) Start : 2004/12/02 End : 2005/01/15 src : 200.160.7.130 (AS22548) dst : 192.33.4.12 25601 queries 1: iad1b.c.root-servers.org 2: ord1a.c.root-servers.org

  9. Anycast Report - C (3) | 20041204093117 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041205055140 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041209132834 | 200.160.7.130 | 142 | ord1a.c.root-servers.org | | 20041210060141 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210060355 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210060651 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210060843 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210061121 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210061357 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210061625 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210061852 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210062118 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210062312 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210062628 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210062812 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210063132 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210063321 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210063546 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210063900 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210064046 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210064348 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210064557 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210064915 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210065133 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210065312 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20041210065628 | 200.160.7.130 | 149 | ord1a.c.root-servers.org | | 20050107072327 | 200.160.7.130 | 160 | ord1a.c.root-servers.org | | 20050107072558 | 200.160.7.130 | 160 | ord1a.c.root-servers.org | | 20050107072904 | 200.160.7.130 | 160 | ord1a.c.root-servers.org | | 20050107073059 | 200.160.7.130 | 160 | ord1a.c.root-servers.org | | 20050107080846 | 200.160.7.130 | 171 | ord1a.c.root-servers.org |

  10. Anycast Report - C (4) Start : 2004/07/03 End : 2005/08/14 src :203.178.142.219 (AS2500) dst :192.33.4.12 3988 queries 1: lax1b.c.root-servers.org

  11. Anycast Report - F (1) Start : 2004/12/02 End : 2005/01/04 src :130.69.251.121 (AS2501) dst :192.5.5.241 13398 queries 1: pao1c.f.root-servers.org 2: lax1b.f.root-servers.org 3: sel1b.f.root-servers.org

  12. Anycast Report - F (2) Start : 2004/12/02 End : 2004/12/03 src :192.134.1.9 (AS2486) dst :192.5.5.241 454 queries 1: sfo2a.f.root-servers.org

  13. Anycast Report - F (3) Start : 2004/12/02 End : 2005/01/15 src :200.160.7.130 (AS22548) dst :192.5.5.241 25630 queries 1: gru1a.f.root-servers.org

  14. Anycast Report - F (4) Start : 2004/07/31 End : 2004/08/14 src :203.178.142.219 (AS2500) dst :192.5.5.241 4020 queries 1: lax1a.f.root-servers.org

  15. Anycast Report - I (1) Start : 2004/12/02 End : 2005/01/04 src :130.69.251.121 (AS2501) dst :192.36.148.17 11499 queries 1: s1.tok

  16. Anycast Report - I (2) Start : 2004/12/02 End : 2004/12/03 src :192.134.1.9 (AS2486) dst :192.36.148.17 454 queries 1: s1.bnx

  17. Anycast Report - I (3) Start : 2004/12/02 End : 2005/01/15 20050107 07:23:16 – 20050107 08:08:58 src :200.169.7.130 20050103 13:43:26 – 20050103 23:56:34 (AS22548) dst :192.36.148.17 20041205 19:33:33 – 20041207 14:56:26 25530 queries 1: s1.tok 2: s1.mix 3: s1.gen 4: s1.ams

  18. Anycast Report - I (4) Start : 2004/07/31 End : 2004/08/14 src :203.178.142.219 (AS2500) dst :192.36.148.17 4029 queries 1: s1.sth 2: s1.bkx

  19. Anycast Report - J (1) Start : 2004/12/02 End : 2005/01/04 1: jns1-kgtld.j.root- servers.net.j.root-servers.net 2: jns3-kgtld.j.root- servers.net.j.root-servers.net 3: jns4-kgtld.j.root- servers.net.j.root-servers.net 4: jns1-kgtld.j.root- servers.net.j.root-servers.net 5: jns3-jgtld.j.root-servers.net 6: jns1-jgtld.j.root-servers.net 7: jns1-kr.j.root-servers.net 8: jns2-fgtld.j.root-servers.net 9: jns3-fgtld.j.root-servers.net 10: jns2-jgtld.j.root-servers.net 11: jns4-jgtld.j.root-servers.net 12: jns4-kgtld.j.root-servers.net 13481 queries 13: jns3-kgtld.j.root-servers.net 14: jns2-kgtld.j.root-servers.net

  20. Anycast Report - J (2) Start : 2004/12/02 End : 2004/12/03 1: jns5-hgtld.j.root-servers.net 2: jns6-hgtld.j.root-servers.net 3: jns4-hgtld.j.root-servers.net 4: jns1-hgtld.j.root-servers.net 5: jns3-hgtld.j.root-servers.net 6: jns2-hgtld.j.root-servers.net 7: jns2-kgtld.j.root- servers.net.j.root-servers.net 8: jns3-kgtld.j.root- servers.net.j.root-servers.net 9: jns1-kgtld.j.root- servers.net.j.root-servers.net 10: jns4-kgtld.j.root- servers.net.j.root-servers.net 459 queries

  21. Anycast Report - J (3) Start : 2004/12/02 End : 2005/01/15 1: jns2-kr.j.root-servers.net 2: jns1-kr.j.root-servers.net 3: jns1-agtld.j.root-servers.net 4: jns4-agtld.j.root-servers.net 5: jns3-agtld.j.root-servers.net 22534 queries

  22. Anycast Report - J (4) Start : 2004/07/31 End : 2004/08/14 1: jns4-kgtld 2: jns1-kgtld 3: jns2-kgtld 4: jns3-kgtld 5: jns4-kgtld.j.root-servers.net 6: jns3-kgtld.j.root-servers.net 7: jns2-kgtld.j.root-servers.net 8: jns1-kgtld.j.root-servers.net 9: jns3-igtld.j.root-servers.net 10: jns2-igtld.j.root-servers.net 11: jns4-igtld.j.root-servers.net 12: jns1-igtld.j.root-servers.net 4034 queries

  23. Anycast Report - K (1) Start : 2004/12/02 End : 2005/01/04 13465 queries 1: k2.ams-ix 2: k1.linx

  24. Anycast Report - K (2) Start : 2004/12/02 End : 2004/12/03 449 queries 1: k2.linx

  25. Anycast Report - K (3) Start : 2004/12/02 End : 2005/01/15 25611 queries 1: k1.linx 2: k2.ams-ix 3: k1.cern

  26. Anycast Report - K (4) Start : 2004/07/31 End : 2004/08/14 4025 queries 1: k2.linx 2: k1.ams-ix

  27. Anycast Report - M (1) Start : 2004/12/02 End : 2004/12/03 423 queries 1: M-cdg2

  28. Anycast Report - M (2) Start : 2004/12/02 End : 2005/01/15 25524 queries 1: M-d2 2: M-cdg1 3: M-n3

  29. Discussion  Similar works  dnsmon  Randy's anycast probe  However, not same results  From dnsprobe, not so many switches...  Probe Interval ?  If we increase probes, dnsprobe observes switches ?  Probe points ?  How Planet lab. Works ?  Where are servers of Planet lab. ?

  30. Future of anycast analysis  How can we collect “reliable” data ?  For collecting data ...  Need more distributed probe points  Just for anycast probing  Dialup probe is enough  For analysis of anycast stability  Fixed host  Long span probes  How do we proceed ?

  31. How it works ?

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