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IPv6 Path MTU in the World and Japan
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Tomoyuki Sahara
June 16, 2014
Technology
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18k
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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Transcript
*1W1BUI.56ͷ ͱରࡦ ࠤݪ ۩ <
[email protected]
> גࣜձࣾΠϯλʔωοτΠχγΞςΟϒ ʙ.56͕খͯ͘͞Կ͕ѱ͍ʂʁʙ
ຊͷ*1W1BUI.56 ͷݱঢ়Λௐࠪ͠·ͨ͠
͖͔͚ͬ JANOG33.5
ੈքنͷௐࠪͷ݁Ռ
ٙ w ͍Ζ͍Ζ՝͕ڍ͛ΒΕ͍ͯΔ͕࣮͋Δͷ͔ʁ ͕ࣗؾ͍͍ͮͯͳ͍͚ͩͳͷ͔ʁ w Ϥʔϩούओମͷௐࠪ݁Ռ͕Ψϥύΰεຊʹ ͯ·Δͷ͔ʁ
ௐͯΈΑ͏ʂ
ௐࠪ݁Ռͷલʹ
*1W1BUI.56 ʹ͍ͭͯܰ͘
.56 1500 Host ϗετ͕ૹग़Ͱ͖Δ ύέοτͷ࠷େ (Maximum Transfer Unit)
.56ճઢ࣍ୈ 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 ?
1BUI.56 ௨৴૬खͱͷؒͷ .56ͷ࠷খ R R R 1500 1454 1280 1436
C S S C 1280 1280 1280 1280 R R R
1BUI.56%JTDPWFSZ 1BUI.56Λ ݟ͚ͭΔಈ࡞ R R R 1500 1454 1280 1436
C S
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
1BUI.56#MBDL)PMF 1BUI.56%JTDPWFSZʹࣦഊ͠ɺ 1BUI.56ΑΓେ͖ͳύέοτΛ ૹΔ͜ͱͰύέϩε͕ൃੜ͢Δݱ R R R 1500 ??? ???
1436 C S ?
5$1.44$MBNQJOH 5$14:/ύέοτͷ.44Φϓγϣϯ Λॻ͖͑ɺ҆શͳ͞Λ௨͢Δٕ R R R 1500 1454 1280 1436
C S 3way handshake Maximum Segment Size .44 Ͱ .44 Ͱ Clamp! $ Ͱ
ௐࠪํ๏
Ͳ͜ͷ1BUI.56Λ ௐΔ͔ʁ
ճઢछྨ .56ͷࣾ-"/ .56ͷ/55ޫωΫετ111P&ଓ .56ͷ1BUI.56#MBDL)PMF͖ͭ *1*1τϯωϧଓ
௨৴૬ख
World IPv6 Launch
ੈքͷαΠτ Top 100
ຊͷαΠτ 94
ͷɺҰ෦ʂ
8PSME +BQBO શମ """"͕ແ͍ *1Wͷ౸ୡੑ͕ͳ͍
ͦͷଞ͍Ζ͍Ζ
ΣϒαΠτӾཡࢼݧ w *1W)551 4 ͰίϯςϯπΛऔಘ͢Δ w ίϯςϯπ,#Ҏ্ͷͷΛબͿ w λΠϜΞτඵͱ͢Δ
݁ՌαϚϦ
World 72 / 72 .56ڥͰޭ Japan 72 / 72
World Japan 72 / 72 ※ؾʹͳΔ1ͭϩγΞͷಈըڞ༗αΠτ .56ڥͰޭ 71 / 72
1
World 63 9 յ໓ɻɻɻ Japan 61 11 #MBDL)PMFڥͰ
5$1.44 $MBNQJOH ೖʂ
World 72 / 72 #MBDL)PMFڥ͕ʹʂ Japan 72 / 72
World 72 / 72 .56ڥͪΖΜ Japan 72 / 72
ίϯςϯπऔಘޭ 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
ৄ͘͠ݟΔ ͦͷ5$1σʔλ ϖΠϩʔυ
5$1σʔλͷ.56 Sites 0 25 50 75 100 TCP Segment Size
(Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 9+10 PMTU black hole ରԠ? ࠷େαΠζ 52+56
5$1σʔλͷ.56 Sites 0 25 50 75 100 TCP Segment Size
(Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 52+56 9+10
5$1σʔλͷ.56 Sites 0 25 50 75 100 TCP Segment Size
(Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 41+52 9+10
5$1σʔλͷ5$1.44 Sites 0 25 50 75 100 TCP Segment Size
(Max) 11721208122012281340134813541360136213681380138213881394140814281440 World Japan 51+57 9+11
w 1BUI.56#MBDL)PMFͷ͋ΔڥͰӾཡͰ͖ͨ αΠτ͡Ί͔Β.56ʹ߹Θ͍ͤͯͨ w 5$1.44$MBNQJOHΛೖΕΔͱύέοτ͕৳ͼ εϧʔϓοτ্͕͢Δ ͜ͱ͕͋Δ 5$1σʔλͷ ͔ΒΘ͔ͬͨ͜ͱ
ৄ͘͠ݟΔ ͦͷ5$1ͷ࠶ૹൃੜ ͷՄೳੑ
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
w .56͕ΑΓখ͍͞ͱ࠶ૹ͕ൃੜ͢ΔՄೳੑ ͕͋Δ 1BUI.56%JTDPWFSZͷͨΊ w 5$1.44$MBNQJOHΛೖΕΔͱ࠶ૹ͕ແ͘ͳΓ εϧʔϓοτͷ্͕ΊΔ 5$1࠶ૹͷ༗ແ ͔ΒΘ͔ͬͨ͜ͱ
ௐࠪͰಘΒΕͨڭ܇
• MTU1500 ͷճઢΛҾ͘ • ICMP6 Packet Too Big ΛϑΟϧλ͠ͳ͍ •
ϧʔλʹ TCP MSS Clamping ΛೖΕ͓ͯ͘ ΫϥΠΞϯτ
• MTU ͕ 1500 ΑΓখ͞ͳϦϯΫΛ࡞Βͳ͍ • ICMP6 Packet Too Big
ΛϑΟϧλ͠ͳ͍ *41
• (҆શΛظ͢ͳΒ) MTU Λ 1280 ʹߜ͓ͬͯ͘ • ্ྲྀʹ MTU<1500 ͳϦϯΫ͕͋Δ߹
MTU Λ ߜΔ͔ TCP MSS Clamping Λ࣮ࢪ͢Δ αʔό
Ҏ্Ͱ͢
࣭͋Γ·ͤΜ͔ ࠤݪ ۩ <
[email protected]
> גࣜձࣾΠϯλʔωοτΠχγΞςΟϒ *1W1BUI.56ͷͱରࡦ ʙ.56͕খͯ͘͞Կ͕ѱ͍ʂʁʙ https://speakerdeck.com/tsahara/ ipv6-path-mtu-in-the-world-and-japan
͓·͚
"""""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
w *1WͰΞΫηεͰ͖ͳ͍ w ϦμΠϨΫτͰඈ͞ΕΔ͕ͦͷઌ͕*1WඇରԠ w ͯ͢ͷύέοτ͕ͭॏෳͯ͠ૹΒΕ͖ͯͨ w ͯ͢ͷύέοτ͕GSBHNFOUͩͬͨ
ௐࠪରআ֎ཧ༝