IPv6 Path MTU in the World and Japan

第6回IPv6オペレーションズフォーラムの発表スライド

Transcript

1. *1W
   1BUI
   .56
   ͷ
   ܏޲ͱରࡦ ࠤݪ ۩޾ <tsahara@iij.ad.jp> גࣜձࣾΠϯλʔωοτΠχγΞςΟϒ ʙ
   .56͕খͯ͘͞Կ͕ѱ͍ʂʁ
   ʙ
2. ೔ຊͷ
   *1W
   1BUI
   .56
   ͷݱঢ়Λௐࠪ͠·ͨ͠
3. ͖͔͚ͬ͸ JANOG33.5
4. ੈքن໛ͷௐࠪͷ݁Ռ
5. ٙ໰ w ͍Ζ͍Ζ՝୊͕ڍ͛ΒΕ͍ͯΔ͕࣮֐͸͋Δͷ͔ʁ ࣗ෼͕ؾ͍͍ͮͯͳ͍͚ͩͳͷ͔ʁ
   w Ϥʔϩούओମͷௐࠪ݁Ռ͕Ψϥύΰε೔ຊʹ΋ ౰ͯ͸·Δͷ͔ʁ
6. ௐ΂ͯΈΑ͏ʂ
7. ௐࠪ݁Ռͷલʹ
8. *1W
   1BUI
   .56
 ʹ͍ͭͯܰ͘
9. .56 1500 Host ϗετ͕ૹग़Ͱ͖Δ
 ύέοτͷ࠷େ௕ (Maximum Transfer Unit)
10. .56஋͸ճઢ࣍ୈ 1500 H Ethernet 1500 H WiFi 1454 H NGN
 PPPoE 1500 H NGN
 IPoE 1280 H 6to4 1436 H IPsec
 VPN 1500 H LTE 1420 H ?
11. 1BUI
    .56 ௨৴૬खͱͷؒͷ
    .56
    ͷ࠷খ஋ R R R 1500 1454 1280 1436 C S S C 1280 1280 1280 1280 R R R
12. 1BUI
    .56
    %JTDPWFSZ 1BUI
    .56
    Λ
 ݟ͚ͭΔಈ࡞ R R R 1500 1454 1280 1436 C S
13. 3way handshake data (size=100) data (size=200) (size=1436) data x data (size=1280) data (size=216) R R R 1500 1454 1280 1436 C S ICMPv6 Packet Too Big $
    ͷ
    1.56
    ͸
    
    Ͷ
14. 1BUI
    .56
    #MBDL
    )PMF 1BUI
    .56
    %JTDPWFSZ
    ʹࣦഊ͠ɺ
    1BUI
    .56
    ΑΓେ͖ͳύέοτΛ
 ૹΔ͜ͱͰύέϩε͕ൃੜ͢Δݱ৅ R R R 1500 ??? ??? 1436 C S ?
15. 5$1
    .44
    $MBNQJOH 5$1
    4:/
    ύέοτͷ
    .44
    Φϓγϣϯ
 ஋Λॻ͖׵͑ɺ҆શͳ௕͞Λ௨஌͢Δٕ R R R 1500 1454 1280 1436 C S 3way handshake Maximum Segment Size .44͸
 Ͱ .44͸
 Ͱ Clamp! $
    ΁͸
 Ͱ
16. ௐࠪํ๏
17. Ͳ͜ͷ
    1BUI
    .56
    Λ
 ௐ΂Δ͔ʁ
18. ճઢछྨ  .56
    ͷࣾ಺
    -"/
     .56
    ͷ
    /55
    ޫωΫετ
    111P&
    ઀ଓ
     .56
    ͷ
    1BUI
    .56
    #MBDL
    )PMF
    ͖ͭ *1*1
    τϯωϧ઀ଓ
19. ௨৴૬ख
20. World IPv6 Launch
21. ੈքͷαΠτ Top 100
22. ೔ຊͷαΠτ 94
23. ͷɺҰ෦ʂ
24. 8PSME +BQBO શମ   """"
    ͕ແ͍   *1W
    ͷ౸ୡੑ͕ͳ͍   ͦͷଞ͍Ζ͍Ζ    
25. ΢ΣϒαΠτӾཡࢼݧ w *1W
    )551 4
    ͰίϯςϯπΛऔಘ͢Δ
    w ίϯςϯπ͸
    ,#
    Ҏ্ͷ΋ͷΛબͿ
    w λΠϜΞ΢τ͸
    
    ඵͱ͢Δ
26. ݁ՌαϚϦ
27. World 72 / 72 .56
    ؀ڥͰ͸
    
    ੒ޭ Japan 72 / 72
28. World Japan 72 / 72 ※ؾʹͳΔ1ͭ͸ϩγΞͷಈըڞ༗αΠτ .56
    ؀ڥͰ΋
    
    ੒ޭ 71 / 72 1
29. World 63 9 յ໓ɻɻɻ Japan 61 11 #MBDL
    )PMF
    ؀ڥͰ͸
    
30. 5$1
    .44
    $MBNQJOH
 ౤ೖʂ
31. World 72 / 72 #MBDL
    )PMF
    ؀ڥ͕
    
    ʹʂ Japan 72 / 72
32. World 72 / 72 .56
    ؀ڥ΋΋ͪΖΜ
     Japan 72 / 72
33. ίϯςϯπऔಘ੒ޭ World Japan MTU1500 72 72 MTU1454 71 72 MTU1454 / TCPMSS 72 72 MTU1400
 PMTU black hole 9 11 MTU1400 / TCPMSS
 PMTU black hole 72 72
34. ৄ͘͠ݟΔ ͦͷ
    5$1
    σʔλ௕
    ϖΠϩʔυ௕
35. 5$1σʔλ௕ͷ෼෍
    .56 Sites 0 25 50 75 100 TCP Segment Size (Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 9+10 PMTU black
 hole ରԠ? ࠷େαΠζ 52+56
36. 5$1σʔλ௕ͷ෼෍
    .56 Sites 0 25 50 75 100 TCP Segment Size (Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 52+56 9+10
37. 5$1σʔλ௕ͷ෼෍
    .56 Sites 0 25 50 75 100 TCP Segment Size (Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 41+52 9+10
38. 5$1σʔλ௕ͷ෼෍
    5$1.44 Sites 0 25 50 75 100 TCP Segment Size (Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 51+57 9+11
39. w 1BUI
    .56
    #MBDL
    )PMF
    ͷ͋Δ؀ڥͰ΋ӾཡͰ͖ͨ αΠτ͸͸͡Ί͔Β
    .56
    ʹ߹Θ͍ͤͯͨ
    w 5$1
    .44
    $MBNQJOH
    ΛೖΕΔͱύέοτ௕͕৳ͼ εϧʔϓοτ͕޲্͢Δ ͜ͱ͕͋Δ 5$1σʔλ௕ͷ෼෍
    ͔ΒΘ͔ͬͨ͜ͱ
40. ৄ͘͠ݟΔ ͦͷ
    5$1ͷ࠶ૹൃੜ
    ͷՄೳੑ
41. 5$1
    ࠶ૹͷ༗ແ ࠶ૹ͋Γ ࠶ૹͳ͠ MTU1500 World 0 72 Japan 2 70 MTU1454 World 25 47 Japan 37 35 MTU1454 TCPMSS World 0 72 Japan 2 70
42. w .56
    ͕
    
    ΑΓখ͍͞ͱ࠶ૹ͕ൃੜ͢ΔՄೳੑ ͕͋Δ
    1BUI
    .56
    %JTDPWFSZ
    ͷͨΊ
    w 5$1
    .44
    $MBNQJOH
    ΛೖΕΔͱ࠶ૹ͕ແ͘ͳΓ
 εϧʔϓοτͷ޲্͕๬ΊΔ 5$1
    ࠶ૹͷ༗ແ
    ͔ΒΘ͔ͬͨ͜ͱ
43. ௐࠪͰಘΒΕͨڭ܇
44. • MTU1500 ͷճઢΛҾ͘ • ICMP6 Packet Too Big ΛϑΟϧλ͠ͳ͍ • ϧʔλʹ TCP MSS Clamping ΛೖΕ͓ͯ͘ ΫϥΠΞϯτ
45. • MTU ͕ 1500 ΑΓখ͞ͳϦϯΫΛ࡞Βͳ͍ • ICMP6 Packet Too Big ΛϑΟϧλ͠ͳ͍ *41
46. • (҆શΛظ͢ͳΒ) MTU Λ 1280 ʹߜ͓ͬͯ͘ • ্ྲྀʹ MTU<1500 ͳϦϯΫ͕͋Δ৔߹͸ MTU Λ ߜΔ͔ TCP MSS Clamping Λ࣮ࢪ͢Δ αʔό
47. Ҏ্Ͱ͢
48. ࣭໰͸͋Γ·ͤΜ͔ ࠤݪ ۩޾ <tsahara@iij.ad.jp> גࣜձࣾΠϯλʔωοτΠχγΞςΟϒ *1W
    1BUI
    .56
    ͷ܏޲ͱରࡦ
    ʙ
    .56͕খͯ͘͞Կ͕ѱ͍ʂʁ
    ʙ https://speakerdeck.com/tsahara/ ipv6-path-mtu-in-the-world-and-japan
49. ͓·͚
50. """""
    ͷ෼෍ 0 30 60 90 120 A / AAAA 0/1 1/1 1/2 1/3 1/4 11/1 2/1 2/2 3/1 3/2 3/3 5/1 World Japan
51. w *1W
    Ͱ΋ΞΫηεͰ͖ͳ͍
    w ϦμΠϨΫτͰඈ͹͞ΕΔ͕ͦͷઌ͕
    *1W
    ඇରԠ
    w ͢΂ͯͷύέοτ͕
    ͭॏෳͯ͠ૹΒΕ͖ͯͨ 
    w ͢΂ͯͷύέοτ͕
    GSBHNFOU
    ͩͬͨ  ௐࠪର৅আ֎ཧ༝