IPv6 RFC 改版の提案はなぜ議論紛糾したのか？

*1W3'$վ൛ͷఏҊ͸ ͳͥٞ࿦ฆڄͨ͠ͷ͔ʁ 5PNPZVLJ4BIBSBUTBIBSB!JJKBEKQ *OUFSOFU*OJUJBUJWF+BQBO*OD

Կͷ࿩ w ɺ*1Wܥ3'$ͷվగ൛͕·ͱΊͯ *&5'-BTU$BMMʹ͔͚ΒΕͨ w վగ಺༰͸جຊతʹطଘͷ3'$Λ੔ཧ͚ͨͩ͠ w ͔ٞ͠͠࿦ฆڄͯ͠ίϯηϯαε͸ಘΒΕͣʜ w *1Wࡦఆ͔Β೥Ҏ্ɺ΋͏े෼࣮੷ΛੵΜͰ
͍ΔΑ͏ʹݟ͑Δ͕ɺԿ͕໰୊ͩͬͨͷ͔

ٞ࿦ΛݺΜͩ*OUFSOFU%SBGU SGDCJT*1WύέοτϑΥʔϚοτ SGDCJT*1WΞυϨε SGDCJT1BUI.56%JTDPWFSZ

SGDCJTͷ࿦఺ w ओͳ࿦఺͸ *1WύέοτΛసૹ͢Δϧʔλ͸ ֦ுϔομΛ௥Ճͯ͠ྑ͍ͷ͔ʁ

֦ுϔομͷ௥Ճ Host Router Router Host wϗετ͕֦ுϔομ෇͖ύέοτΛ࡞Δͷ͸ࣗ༝ wϧʔλ్͕தͰϔομΛ௥Ճ࡟আ͢Δͷ͸ʜ

໰୊ͷจষ w సૹ࿏ͷϊʔυ ϧʔλ ͸֦ுϔομʹ͞ΘͬͪΌ μϝͱॻ͍ͯ͋ΔΑ͏ʹݟ͑Δ͕ʜ With one exception, extension
headers are not processed by any node along a packet's delivery path, until the packet reaches the node (…) identified in the Destination Address field of the IPv6 header. draft-ietf-6man-rfc2460bis-08 4.

΂ͭʹ௥Ճͯ͠΋ྑ͍͡ΌΜ w ʮ௥ՃʯΛ໌֬ʹېࢭ͢Δจݴ͸ͳ͍ΑͶɻ w ֦ுϔομͰ࣮ݱ͞ΕΔ৽ϓϩτίϧͷESBGU΋ ఏҊ͞Ε͍ͯΔ͠ɻ w ͖ͪΜͱ؅ཧ͞ΕͨυϝΠϯ಺Ͱ͋Ε͹ɺ֦ுϔο μΛ௥Ճͯ͠΋ѱ͍Өڹ͸ͳ͍Ͱ͠ΐ

͍΍ɺͦΕ͸ແཧͩΖ͏ w lQSPDFTTz͠ͳ͍͚Ͳ௥Ճ͢Δͬͯ w 3'$͸ΤϯυϊʔυҎ֎͕֦ுϔομΛ௥Ճ ͢Δ͜ͱΛ૝ఆ͍ͯ͠ͳ͍ɻ w ్தͰ௥Ճ͞ΕͨΒ*1TFD"VUIFOUJDBUJPO )FBEFS΍1BUI.56%JTDPWFSZ͕յΕΔɻ

ٞ࿦͸ଓ͘ʜ w ݱࡏͷεςʔλεNBOXHʹ໭Γܧଓ৹ٞ w ϧʔλʹΑΔ֦ுϔομͷ௥Ճ͸/(ͱ͍͏ ίϯηϯαε͸ಘΒΕͨΑ͏ͩ w ͔͠͠·ͩ·ͩٞ࿦͸ଓ͘ʜ w
௥Ճ/(ͩͱ*1Wͷ֦ுੑʹ೉͕ʜ w ͱ͜ΖͰIPQCZIPQϔομͷنఆ΋ݫ͠ ͗͢ͳ͍

SGDCJTͷ࿦఺ w ओͳ࿦఺͸ *OUFSGBDF*%͕CJU͡Όͳ͖Ό ͍͚ͳ͍ཧ༝͸ແ͍ͷͰ͸ʁ

*OUFSGBDF*% w *OUFSGBDF*%͸ *1WΞυϨεͷҰ෦෼ͷ͜ͱͰɺ ϦϯΫதͰΠϯλϑΣʔεΛಛఆ͢Δࣝผࢠ w ཁ͢Δʹʮ*1WΞυϨεͷԼͷํʯ 2.4.6. Link-Local IPv6
Unicast Addresses (தུ) | 10 | | bits | 54 bits | 64 bits | +----------+-------------------------+----------------------------+ |1111111010| 0 | interface ID | +----------+-------------------------+----------------------------+

໰୊ͷจষ wۃΊͯ໌֬ʹʮϏοτ௕ͩʯͱ ॻ͍ͯ͋Δͷ͕ͩʜ the Interface ID of all unicast addresses,
except those that start with the binary value 000, is required to be 64 bits long. draft-ietf-6man-rfc4291bis-07 2.4.

lzͷࠜڌ͸ʁ w CJUͰͳ͚Ε͹ͳΒͳ͍ཧ༝͸͍·͍ͪෆ໌֬ w 3'$ 4-""$ Ͱ͸*OUFSGBDF*%͕ Ҏ֎ͷ௕͞Ͱ΋ಈ͘Α͏ͳHFOFSJDͳॻ͖ ํʹͳ͍ͬͯΔ͠ɺ w
QPJOUUPQPJOUMJOLͰϓϨϑΟΫε Λ࢖͏3'$΋ग़͍ͯΔΑʁ

Ͱ͸ՄมͰྑ͍ͷ͔ʁ w CJUʹͨ͠ͷ͸ʮઃܭ্ͷ൑அʯͰ͠ΐ͏ w ܾΊ͓ͯ͘͜ͱʹҙ͕ٛ͋Δɻ w Մมʹ͢Δͱ͍͍ͪͪߟ͑ͳ͚Ε͹ͳΒͳ͍ɻ w ͍·͔Βม͑Δͱ৭ΜͳॴΛ௚͞ͳ͍ͱ͍͚ͳ͍ w
࢓༷࣮૷ͱ΋ʹɻ*1WωοτϫʔΫͷߏங ӡ༻ʹ΋ΠϯύΫτ͋Γɻ

SGDCJTͷ࿦఺ w ࿦఺͸͍Ζ͍Ζɻ w ݱ࣮ʹ͸*$.1ͷϑΟϧλϦϯάͰಈ͔ͳ͍ έʔε͕͋Δ͡Όͳ͍͔ɻ w 5$1Ҏ֎ͷ্Ґ૚ 6%1΍*1τϯωϦϯά Ͱ
͏·͘ಈ͔ͳ͍ͧɻ w 1-1.56% -BZFSͱڠྗͯ͠1.56%૬౰ ͷ͜ͱΛ΍Δํ๏ ͷํ͕ے͕ྑ͍ɻ

ͳͥٞ࿦ʹͳΔͷ͔ʁ w 1BUI.56%JTDPWFSZ͕ݱ࣮ੈքͰ ظ଴͢Δ ΄Ͳ ͏·͘ಈ͍͍ͯͳ͍͔ΒͩΖ͏ɻ w *$.1ͷϑΟϧλ w &$.1"OZDBTU
w ͦ΋ͦ΋εέʔϧ͠ͳ͍࢓༷

·ͱΊ w *1W࢓༷ͷΠϯλʔωοτඪ४Խ͸͢ΜͳΓ௨Γ ·ͤΜͰͨ͠ɻ w ৔ॴΛม͑ͯ·ͩ·ͩٞ࿦͕ܧଓ͍ͯ͠·͢ɻ ݸਓతͳײ૝3'$΍3'$ʹ ൺ΂Ε͹ඦഒ·͠ʹॻ͔Ε͍ͯΔͷͰɺඪ४ ʹͪ͠Όͬͯ΋͍͍ͷͰ͸

IPv6 RFC 改版の提案はなぜ議論紛糾したのか？

IPv6 RFC 改版の提案はなぜ議論紛糾したのか？

Tomoyuki Sahara

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1W3'$վ൛ͷఏҊ͸ ͳͥٞ࿦ฆڄͨ͠ͷ͔ʁ 5PNPZVLJ4BIBSBUTBIBSB!JJKBEKQ OUFSOFUOJUJBUJWF+BQBOOD

Կͷ࿩ w ɺ1Wܥ3'$ͷվగ൛͕·ͱΊͯ &5'-BTU$BMMʹ͔͚ΒΕͨ w վగ಺༰͸جຊతʹطଘͷ3'$Λ੔ཧ͚ͨͩ͠ w ͔ٞ͠͠࿦ฆڄͯ͠ίϯηϯαε͸ಘΒΕͣʜ w *1Wࡦఆ͔Β೥Ҏ্ɺ΋͏े෼࣮੷ΛੵΜͰ

ٞ࿦ΛݺΜͩOUFSOFU%SBGU SGDCJT1WύέοτϑΥʔϚοτ SGDCJT*1WΞυϨε SGDCJT1BUI.56%JTDPWFSZ

SGDCJTͷ࿦఺ w ओͳ࿦఺͸ *1WύέοτΛసૹ͢Δϧʔλ͸ ֦ுϔομΛ௥Ճͯ͠ྑ͍ͷ͔ʁ

֦ுϔομͷ௥Ճ Host Router Router Host wϗετ͕֦ுϔομ෇͖ύέοτΛ࡞Δͷ͸ࣗ༝ wϧʔλ్͕தͰϔομΛ௥Ճ࡟আ͢Δͷ͸ʜ

໰୊ͷจষ w సૹ࿏ͷϊʔυ ϧʔλ ͸֦ுϔομʹ͞ΘͬͪΌ μϝͱॻ͍ͯ͋ΔΑ͏ʹݟ͑Δ͕ʜ With one exception, extension

΂ͭʹ௥Ճͯ͠΋ྑ͍͡ΌΜ w ʮ௥ՃʯΛ໌֬ʹېࢭ͢Δจݴ͸ͳ͍ΑͶɻ w ֦ுϔομͰ࣮ݱ͞ΕΔ৽ϓϩτίϧͷESBGU΋ ఏҊ͞Ε͍ͯΔ͠ɻ w ͖ͪΜͱ؅ཧ͞ΕͨυϝΠϯ಺Ͱ͋Ε͹ɺ֦ுϔο μΛ௥Ճͯ͠΋ѱ͍Өڹ͸ͳ͍Ͱ͠ΐ

͍΍ɺͦΕ͸ແཧͩΖ͏ w lQSPDFTTz͠ͳ͍͚Ͳ௥Ճ͢Δͬͯ w 3'$͸ΤϯυϊʔυҎ֎͕֦ுϔομΛ௥Ճ ͢Δ͜ͱΛ૝ఆ͍ͯ͠ͳ͍ɻ w ్தͰ௥Ճ͞ΕͨΒ*1TFD"VUIFOUJDBUJPO )FBEFS΍1BUI.56%JTDPWFSZ͕յΕΔɻ

ٞ࿦͸ଓ͘ʜ w ݱࡏͷεςʔλεNBOXHʹ໭Γܧଓ৹ٞ w ϧʔλʹΑΔ֦ுϔομͷ௥Ճ͸/(ͱ͍͏ ίϯηϯαε͸ಘΒΕͨΑ͏ͩ w ͔͠͠·ͩ·ͩٞ࿦͸ଓ͘ʜ w

SGDCJTͷ࿦఺ w ओͳ࿦఺͸ OUFSGBDF%͕CJU͡Όͳ͖Ό ͍͚ͳ͍ཧ༝͸ແ͍ͷͰ͸ʁ

OUFSGBDF% w OUFSGBDF%͸ 1WΞυϨεͷҰ෦෼ͷ͜ͱͰɺ ϦϯΫதͰΠϯλϑΣʔεΛಛఆ͢Δࣝผࢠ w ཁ͢Δʹʮ1WΞυϨεͷԼͷํʯ 2.4.6. Link-Local IPv6

໰୊ͷจষ wۃΊͯ໌֬ʹʮϏοτ௕ͩʯͱ ॻ͍ͯ͋Δͷ͕ͩʜ the Interface ID of all unicast addresses,

lzͷࠜڌ͸ʁ w CJUͰͳ͚Ε͹ͳΒͳ͍ཧ༝͸͍·͍ͪෆ໌֬ w 3'$ 4-""$ Ͱ͸OUFSGBDF%͕ Ҏ֎ͷ௕͞Ͱ΋ಈ͘Α͏ͳHFOFSJDͳॻ͖ ํʹͳ͍ͬͯΔ͠ɺ w

Ͱ͸ՄมͰྑ͍ͷ͔ʁ w CJUʹͨ͠ͷ͸ʮઃܭ্ͷ൑அʯͰ͠ΐ͏ w ܾΊ͓ͯ͘͜ͱʹҙ͕ٛ͋Δɻ w Մมʹ͢Δͱ͍͍ͪͪߟ͑ͳ͚Ε͹ͳΒͳ͍ɻ w ͍·͔Βม͑Δͱ৭ΜͳॴΛ௚͞ͳ͍ͱ͍͚ͳ͍ w

SGDCJTͷ࿦఺ w ࿦఺͸͍Ζ͍Ζɻ w ݱ࣮ʹ͸$.1ͷϑΟϧλϦϯάͰಈ͔ͳ͍ έʔε͕͋Δ͡Όͳ͍͔ɻ w 5$1Ҏ֎ͷ্Ґ૚ 6%1΍1τϯωϦϯά Ͱ

ͳͥٞ࿦ʹͳΔͷ͔ʁ w 1BUI.56%JTDPWFSZ͕ݱ࣮ੈքͰ ظ଴͢Δ ΄Ͳ ͏·͘ಈ͍͍ͯͳ͍͔ΒͩΖ͏ɻ w *$.1ͷϑΟϧλ w &$.1"OZDBTU

·ͱΊ w *1W࢓༷ͷΠϯλʔωοτඪ४Խ͸͢ΜͳΓ௨Γ ·ͤΜͰͨ͠ɻ w ৔ॴΛม͑ͯ·ͩ·ͩٞ࿦͕ܧଓ͍ͯ͠·͢ɻ ݸਓతͳײ૝3'$΍3'$ʹ ൺ΂Ε͹ඦഒ·͠ʹॻ͔Ε͍ͯΔͷͰɺඪ४ ʹͪ͠Όͬͯ΋͍͍ͷͰ͸