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IPv6 Path MTU in the World and Japan

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

Tomoyuki Sahara

June 16, 2014
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  1. .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 ?
  2. 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 $ͷ1.56 ͸Ͷ
  3. 5$1.44$MBNQJOH 5$14:/ύέοτͷ.44Φϓγϣϯ
 ஋Λॻ͖׵͑ɺ҆શͳ௕͞Λ௨஌͢Δٕ R R R 1500 1454 1280 1436

    C S 3way handshake Maximum Segment Size .44͸
 Ͱ .44͸
 Ͱ Clamp! $΁͸
 Ͱ
  4. 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
  5. 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
  6. 5$1σʔλ௕ͷ෼෍.56 Sites 0 25 50 75 100 TCP Segment Size

    (Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 52+56 9+10
  7. 5$1σʔλ௕ͷ෼෍.56 Sites 0 25 50 75 100 TCP Segment Size

    (Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 41+52 9+10
  8. 5$1σʔλ௕ͷ෼෍5$1.44 Sites 0 25 50 75 100 TCP Segment Size

    (Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 51+57 9+11
  9. 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
  10. • MTU1500 ͷճઢΛҾ͘ • ICMP6 Packet Too Big ΛϑΟϧλ͠ͳ͍ •

    ϧʔλʹ TCP MSS Clamping ΛೖΕ͓ͯ͘ ΫϥΠΞϯτ
  11. """""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