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basics_of_dns_that_phper_should_know
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mamy1326
April 25, 2018
Programming
2
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basics_of_dns_that_phper_should_know
第125回 PHP勉強会@東京 で発表したスライドです。
mamy1326
April 25, 2018
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Transcript
1)1FS͕Δ͖ %/4ͷ͖΄Μ ·Έͳ͓͖ !NBNZ "QSୈճ1)1ษڧձˏ౦ژ
ࣗݾհ Name ɿ·Έͳ͓͖ ॴଐɹ ɿInnovator Japan Inc. Twitterɿ@mamy1326 - ීஈPHPॻ͍ͯ·͢
- 20183݄ʹDNSͷษڧΛ࢝ΊΔ - ࠓ1ωοτϫʔΫ͕ςʔϚ
ຊ ࣋ͪؼͬͯ ͍ͨͩ͘͜ͱ
%/4ා͘ͳ͍ʂ Λ͍͑ͨ
งғؾͰ υϝΠϯ໊ %/4ΛͬͯΔਓ͕
͜Μͳ͜ͱͯ͠ΔΑ ͱݴ͏جຊͷҰ෦Λ Δ͜ͱͰ
υϝΠϯ໊ͱ *1ΞυϨεΛ લΑΓ্ख͘ѻ͑ͯ
ࠓΑΓͬͱ ָ͘͠ͳΔ͖͔͚ͬ ʹ͍ͨ͠
ɹɹେܴ
͓͢Δ͜ͱ ▶︎ υϝΠϯ໊ͷੜཱ͍ͪ ▶︎ ໊લղܾ ▶︎ ߏͱκʔϯ ▶︎ ϦιʔεϨίʔυ ▶︎
ίϯςϯπαʔό ▶︎ ελϒϦκϧό ͱϑϧαʔϏεϦκϧό ▶︎ DNS·ͱΊ
͓͢Δ͜ͱ ▶︎ υϝΠϯ໊ͷੜཱ͍ͪ ▶︎ ໊લղܾ ▶︎ ߏͱκʔϯ ▶︎ ϦιʔεϨίʔυ ▶︎
ίϯςϯπαʔό ▶︎ ελϒϦκϧό ͱϑϧαʔϏεϦκϧό ▶︎ DNS·ͱΊ
8FCαʔό*1ΞυϨεͰܨ͕Δ
8FCαΠτΛ ݟ͍ͨͳ Πϯλʔωοπ ॅॴͱͯ͠*1ΞυϨεࢦఆ͠ ɹɹίϯςϯπΛϦΫΤετ⾣ ⾢ॅॴͱͯ͠*1ΞυϨεࢦఆ͠ ɹɹίϯςϯπΛฦ͢ ίϯςϯπΛ ฦ͢Α ΫϥΠΞϯτ
8FCαʔό 8FCαʔό*1ΞυϨεͰܨ͕Δ
Πϯλʔωοπ ॅॴͱͯ͠*1ΞυϨεࢦఆ͠ ɹɹίϯςϯπΛϦΫΤετ⾣ ⾢ॅॴͱͯ͠*1ΞυϨεࢦఆ͠ ɹɹίϯςϯπΛฦ͢ 8FCαʔό ΫϥΠΞϯτ 8FCαʔό*1ΞυϨεͰܨ͕Δ
Πϯλʔωοπ 8FCαʔό ΫϥΠΞϯτ 5$1*1 8FCαʔό*1ΞυϨεͰܨ͕Δ
%/4͕ͳ͍߹
⾣8FCαΠτΛݟ͍ͨ %/4͕ͳ͍߹
⾣8FCαΠτΛݟ͍ͨ XXXIPOOPKJOPIFOKQ Πϯλʔωοπ ϒϥβ 8FCαʔό %/4͕ͳ͍߹
⾣8FCαΠτΛݟ͍ͨ XXXIPOOPKJOPIFOKQ Πϯλʔωοπ υϝΠϯ໊ࢦఆ͠ ɹɹίϯςϯπΛϦΫΤετ⾣ ϒϥβ 8FCαʔό %/4͕ͳ͍߹
⾣8FCαΠτΛݟ͍ͨ XXXIPOOPKJOPIFOKQ Πϯλʔωοπ υϝΠϯ໊ࢦఆ͠ ɹɹίϯςϯπΛϦΫΤετ⾣ ࠓɺຊೳࣉ͕ ͍ ϒϥβ 8FCαʔό %/4͕ͳ͍߹
⾣8FCαΠτΛݟ͍ͨ XXXIPOOPKJOPIFOKQ Πϯλʔωοπ υϝΠϯ໊ࢦఆ͠ ɹɹίϯςϯπΛϦΫΤετ⾣ ϦΫΤετ͕ಧ͔ͳ͍ͷͰ ͞Λ͑ΒΕͳ͍ ࠓɺຊೳࣉ͕ ͍ ϒϥβ
8FCαʔό %/4͕ͳ͍߹
ຊདྷ *1ΞυϨεΛ ࢦఆ͖͢
͔͠͠ ਓؒ ࣈ͕ۤख
⾣υϝΠϯ໊Λ͏ཧ༝ ɾਓ֮ؒ͑ΒΕͳ͍ ɹˠͱ͔ࣈͷཏྻ ɾ*1ΞυϨεͰҙຯΛදݱͰ͖ͳ͍ ͦ͜ͰυϝΠϯ໊ͷొ 8FCϝʔϧυϝΠϯ໊ࢦఆ
⾣υϝΠϯ໊ͷϝϦοτ ɾ͍֮͑͢ʂ ɹˠXXXIPOOPKJOPIFOKQͳΔ΄Ͳຊೳࣉ ɾαʔϏεʹ߹໊ͬͨલΛબ *1ΞυϨεͷΘΓʹ ѼઌࢦఆͷจࣈྻʹυϝΠϯ໊ 8FCϝʔϧυϝΠϯ໊ࢦఆ
υϝΠϯ໊ͱ *1ΞυϨεΛ ؔ࿈͚ͮΔඞཁ͕͋Δ
͓͢Δ͜ͱ ▶︎ υϝΠϯ໊ͷੜཱ͍ͪ ▶︎ ໊લղܾ ▶︎ ߏͱκʔϯ ▶︎ ϦιʔεϨίʔυ ▶︎
ίϯςϯπαʔό ▶︎ ελϒϦκϧό ͱϑϧαʔϏεϦκϧό ▶︎ DNS·ͱΊ
%PNBJO/BNF4ZTUFN ⾣υϝΠϯ໊ͱ*1ΞυϨεΛඥ͚ ɾॅॴͰ͋Δ*1ΞυϨε͕Θ͔Βͳ͍ ɹɹˠαʔϏεड͚ΒΕͳ͍ ɾυϝΠϯ໊Λ߹ͤ ɹɹˠ*1ΞυϨεΛԠ %/4Ͱ໊લղܾ
໊લղܾ ⾣ͬ͘͟Γͱͨ͠Έ ɾυϝΠϯ໊ͷ*1ΞυϨεΛղܾ͢ΔΈ ɹɹˠͦΕҎ֎ͷׂࠓճ͠·ͤΜ ɾͷʮ%/4ݖҖαʔόʯʴଟͷηΧϯμϦ ɹɹˠ%/4ίϯςϯπαʔό ɾϒϥβ͕04ͷιϑτΣΞ໊લղܾΛґཔ ɹɹˠґཔ͞ΕΔͷελϒϦκϧό ɾ%/4αʔόʹ߹໊ͤͯલղܾ ɹɹˠϑϧαʔϏεϦκϧό
ελϒϦκϧό ϩʔΧϧͷ %/4αʔό ࠶ؼݕࡧ ᶃXXXNBNZKQΛϒϥβͰ࣮ߦ %/4Ωϟογϡαʔό ʢϑϧαʔϏεϦκϧόʣ ϧʔτ %/4αʔό KQ
%/4αʔό NBNZKQ %/4αʔό NBNZKQͷ8FCαʔό *1 ᶅXXXNBNZKQͷ*1ΞυϨεڭ͑ͯʂ⾣ ⾢ᶆKQ͔ͩΒɺKQͷ%/4αʔόʹฉ͍ͯʂ KQͷ%/4αʔόͷ /4Ϩίʔυͱ"ϨίʔυΛฦ͢ ᶇXXXNBNZKQͷ*1ΞυϨεڭ͑ͯʂ⾣ ⾢ᶈNBNZͷ%/4αʔόʹฉ͍ͯʂ NBNZͷ%/4αʔόͷ /4Ϩίʔυͱ"ϨίʔυΛฦ͢ ᶉXXXNBNZKQͷ*1ΞυϨεڭ͑ͯʂ⾣ ⾢ᶊXXXNBNZKQ XXXNBNZKQͷ "ϨίʔυΛฦ͢ ෮ ݕ ࡧ ˛ᶋXXXNBNZKQͷ ɹ*1ΞυϨε ᶌ8FCϒϥβ͕ʹΞΫηε⾣ ᶄXXXNBNZKQ ɹͷ*1ΞυϨεʁ˝ %/4ίϯςϯπαʔό ໊લղܾͷྲྀΕ
%/4ॏཁͳΠϯϑϥ Ϣʔβ αʔό Πϯλʔωοτ Πϯλʔωοτ্ͷ αʔϏεΛड͚͍ͨ Ѽઌͷࢦఆ ⾣Ѽઌͷࢦఆ
%/4ॏཁͳΠϯϑϥ ⾣ѼઌυϝΠϯ໊ ɹ̴̬̱αʔϏεʜʜʜIUUQTXXXNBNZDPN ɹిࢠϝʔϧʜʜʜʜʜJOGP!NBNZDPN ɹϑΝΠϧసૹʜʜʜʜGUQGUQNBNZDPN υϝΠϯ໊͕͋Δ͔ΒαʔϏε͕ड͚ΒΕΔ ʹ %/4ΠϯλʔωοτͷΠϯϑϥ
υϝΠϯ໊ Ͳ͏ཧ͞ΕΔͷ͔
͓͢Δ͜ͱ ▶︎ υϝΠϯ໊ͷੜཱ͍ͪ ▶︎ ໊લղܾ ▶︎ ߏͱκʔϯ ▶︎ ϦιʔεϨίʔυ ▶︎
ίϯςϯπαʔό ▶︎ ελϒϦκϧό ͱϑϧαʔϏεϦκϧό ▶︎ DNS·ͱΊ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ϧʔτ EOT HBNF υϝΠϯ໊ߏ
υϝΠϯ໊ߏ KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL
DPN ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ υϝΠϯ໊ߏ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ υϝΠϯ໊ߏ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ υϝΠϯ໊ߏ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ߏΛ ෮߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ υϝΠϯ໊ߏ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ߏΛ ෮߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ 5PQ-FWFM%PNBJO Λཧ τοϓϨϕϧυϝΠϯ υϝΠϯ໊ߏ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ߏΛ ෮߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ KQυϝΠϯ Λཧ υϝΠϯ໊ߏ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ߏΛ ෮߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ DPKQυϝΠϯ Λཧ υϝΠϯ໊ߏ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ߏΛ ෮߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ NBNZDPKQ υϝΠϯΛཧ υϝΠϯ໊ߏ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ߏΛ ෮߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ TUVEZNBNZDPKQ υϝΠϯΛཧ υϝΠϯ໊ߏ
KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ϧʔτ EOT HBNF ໊લۭؒ υϝΠϯ໊ߏ
ߏͱκʔϯ KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL
DPN ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ
ߏͱκʔϯ KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL
DPN ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ ϧʔτͷ ωʔϜαʔό ͷκʔϯ
ߏͱκʔϯ KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL
DPN ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ KQͷ ωʔϜαʔόͷκʔϯ
ߏͱκʔϯ KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL
DPN DPKQͷ ωʔϜαʔόͷκʔϯ ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ
ߏͱκʔϯ KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL
DPN NBNZDPKQͷ ωʔϜαʔόͷκʔϯ ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ
ߏͱκʔϯ ⾣υϝΠϯ໊ิ ɾυϝΠϯ໊ӈ͔Βղऍ ɹˠτοϓ ˠKQˠDPˠNBNZˠʜ ɾKQυϝΠϯ+134 +B1BO3FHJTUSZ4FSWJDFT ɹˠKQυϝΠϯͷ૯ݩకΊ
ɾඇӦརஂମ*$"// *OUFSOFU$PSQPSBUJPOGPS"TTJHOFE/BNFTBOE/VNCFST ɹˠυϝΠϯͱ*1ΞυϨεͷ૯ݩకΊ
ߏͱκʔϯ ⾣κʔϯิ ɾυϝΠϯͷ͕κʔϯ ɹˠ53*$,ʹग़ͯ͘Δ୯ޠͰͳ͍ ɾκʔϯʹ%/4ίϯςϯπαʔό͕͋Δ ɹˠ෮ݕࡧͰͭͳ͍Ͱߦ͘ ɾجຊతʹࣗͷκʔϯ͚ͩΛཧ ɹˠκʔϯϑΝΠϧͷهड़ʹΑͬͯෳཧ
κʔϯϑΝΠϧͷ தͷ
͓͢Δ͜ͱ ▶︎ υϝΠϯ໊ͷੜཱ͍ͪ ▶︎ ໊લղܾ ▶︎ ߏͱκʔϯ ▶︎ ϦιʔεϨίʔυ ▶︎
ίϯςϯπαʔό ▶︎ ελϒϦκϧό ͱϑϧαʔϏεϦκϧό ▶︎ DNS·ͱΊ
໊લղܾͷԠ ⾣Ԡ͢Δใ͕ඞཁ ɾ໊લղܾͷԠ༻ϨίʔυΛ࣋ͭ ɹɹˠ֤%/4ίϯςϯπαʔόͰσʔλϕʔεԽ ɾυϝΠϯ໊ͷ߹ͤʹԠ͢Δ ɹɹˠ໊લղܾͰ͖Δ Ԡ͢ΔϨίʔυΛ ϦιʔεϨίʔυͱݺͿ
ϦιʔεϨίʔυ ⾣%/4ίϯςϯπαʔό͕ཧ ɾσʔλϕʔεԽ͞ΕͨκʔϯϑΝΠϧͷத ɹˠཧԼͷϗετʢαʔόʣͳͲͷใ ɾܾ·ͬͨϑΥʔϚοτ͕͋Δ ɹˠυϝΠϯ໊ɺϗετ໊ɺछྨɺઃఆ ɾ༻్ʹԠ༷ͯ͡ʑͳछྨ͕͋Δ ɹˠ/4ɺ"ɺ$/".&ɺ.9ɺ40"ɺͳͲͳͲ ɹɹ"84ͩͱ3PVUFʹొ͢Δ
දతͳ ϦιʔεϨίʔυ ʢ/4ɺ"ʣ
/4 /BNF4FSWFS Ϩίʔυ ⾣υϝΠϯ໊ͷ͍߹ΘͤઌΛද͢ ɾཧ͍ͯ͠Δ%/4ίϯςϯπαʔόͷҕୗઌ ɹˠυϝΠϯ໊NBNZKQ͜ͷ%/4αʔόʹฉ͍ͯ͘Ε ɾ/4ϨίʔυΛυϝΠϯ໊ʹؔ࿈͚ͮΔ ɹˠυϝΠϯ໊Λऔಘͨ͠ͱ͜Ζʹ໊લղܾઌΛొ ɾྫɿ໊͓લͷυϝΠϯ໊ͷ%/4Λ"84Ͱཧ͍ͨ͠ ɹˠᶃ3PVUFʹ)PTUFE[POF
ཧ͍ͨ͠υϝΠϯ໊ Λొ ɹɹᶄ/4Ϩίʔυ͕ҰఆͷϧʔϧͰ࡞ΒΕɺ%/4αʔόׂΓͯ ɹɹᶅ%/4αʔό໊Λ໊͓લͷ֘υϝΠϯ໊ʹొ
⾣ओͳϑΥʔϚοτ ໊લ λΠϓ 55- σʔλ 3%"5" NBNZKQ /4 OTBXTEOTDPN
/4 /BNF4FSWFS Ϩίʔυ ɾ໊લ ɹɹˠϦιʔεϨίʔυͷ໊લɻ/4ͷ߹υϝΠϯ໊ͱͳΔ ɾλΠϓ ɹɹˠϦιʔεϨίʔυΛࣝผ͢ΔλΠϓɻ/4ωʔϜαʔόʔΛද͢ ɾ55- ɹɹˠϦιʔεϨίʔυΛΩϟογϡ͢Δ࣌ؒ ඵ ɾσʔλ ɹɹˠλΠϓʹґଘ͢Δσʔλɻ/4ͷ߹%/4ίϯςϯπαʔό໊
⾣EJHίϚϯυͰݟΔ /4 /BNF4FSWFS Ϩίʔυ EJH"/:ZPVSTHNPKQ ʢதུʣ 26&45*0/4&$5*0/ ZPVSTHNPKQ
*/ "/: "/48&34&$5*0/ ZPVSTHNPKQ */ " "65)03*5:4&$5*0/ HNPKQ */ /4 OTHNPJOUFSOFUKQ HNPKQ */ /4 OTHNPJOUFSOFUKQ HNPKQ */ /4 OTHNPJOUFSOFUDPN "%%*5*0/"-4&$5*0/ OTHNPJOUFSOFUDPN */ " OTHNPJOUFSOFUKQ */ " OTHNPJOUFSOFUDPN */ """" OTHNPJOUFSOFUKQ */ """" %/4ίϯςϯπαʔό໊
⾣EJHίϚϯυͰݟΔ /4 /BNF4FSWFS Ϩίʔυ EJH"/:ZPVSTHNPKQ ʢதུʣ 26&45*0/4&$5*0/ ZPVSTHNPKQ
*/ "/: "/48&34&$5*0/ ZPVSTHNPKQ */ " "65)03*5:4&$5*0/ HNPKQ */ /4 OTHNPJOUFSOFUKQ HNPKQ */ /4 OTHNPJOUFSOFUKQ HNPKQ */ /4 OTHNPJOUFSOFUDPN "%%*5*0/"-4&$5*0/ OTHNPJOUFSOFUDPN */ " OTHNPJOUFSOFUKQ */ " OTHNPJOUFSOFUDPN */ """" OTHNPJOUFSOFUKQ */ """" %/4ίϯςϯπαʔόͷ ࣮ࡍͷ*1ΞυϨε
" "EESFTT Ϩίʔυ ⾣υϝΠϯ໊ʹରԠ͢Δ*1ΞυϨε ɾ*1Wͷ*1ΞυϨεΛॻ͘ ɹˠ*1Wͷ߹ɺ""""Ϩίʔυʹॻ͘ ɾαʔϏε͍ͯ͠Δαʔόͷ*1ΞυϨε ɹˠ8FCαʔόͩͬͨΓɺϩʔυόϥϯαʔͩͬͨΓ ɾਖ਼Ҿ͖༻ͷϨίʔυ ɹˠυϝΠϯ໊͔Β*1ΞυϨεΛಘΔ͜ͱΛਖ਼Ҿ͖ͱ͍͏
⾣ओͳϑΥʔϚοτ ໊લ λΠϓ 55- σʔλ 3%"5" NBNZKQ "
ɾ໊લ ɹɹˠϦιʔεϨίʔυͷ໊લɻ"ͷ߹υϝΠϯ໊ͱͳΔ ɾλΠϓ ɹɹˠϦιʔεϨίʔυΛࣝผ͢ΔλΠϓɻ"*1ΞυϨεΛද͢ ɾ55- ɹɹˠϦιʔεϨίʔυΛΩϟογϡ͢Δ࣌ؒ ඵ ɾσʔλ ɹɹˠλΠϓʹґଘ͢Δσʔλɻ"ͷ߹αʔόͷ*1ΞυϨε " "EESFTT Ϩίʔυ
⾣EJHίϚϯυͰݟΔ EJH"/:ZPVSTHNPKQ ʢதུʣ 26&45*0/4&$5*0/ ZPVSTHNPKQ */ "/: "/48&34&$5*0/
ZPVSTHNPKQ */ " "65)03*5:4&$5*0/ HNPKQ */ /4 OTHNPJOUFSOFUKQ HNPKQ */ /4 OTHNPJOUFSOFUKQ HNPKQ */ /4 OTHNPJOUFSOFUDPN "%%*5*0/"-4&$5*0/ OTHNPJOUFSOFUDPN */ " OTHNPJOUFSOFUKQ */ " OTHNPJOUFSOFUDPN */ """" OTHNPJOUFSOFUKQ */ """" υϝΠϯ໊ʹରԠ͢Δ *1ΞυϨε " "EESFTT Ϩίʔυ
ϦιʔεϨίʔυ·ͱΊ ⾣/4Ϩίʔυ͕ͳ͍ͱʁ ɾ%/4ίϯςϯπαʔό͕Θ͔Βͳ͍ ɹˠυϝΠϯ໊ཧͷҕୗઌ͕ෆ໌ʹ໊લղܾͰ͖ͳ͍ ⾣"Ϩίʔυ͕ͳ͍ͱʁ ɾαʔϏε͍ͯ͠Δαʔό͕Θ͔Βͳ͍ ɹˠ*1ΞυϨεΛԠͰ͖ͳ͍ʹαʔϏεͰ͖ͳ͍
Ͱʁ %/4ίϯςϯπαʔό ͬͯԿʁ
͓͢Δ͜ͱ ▶︎ υϝΠϯ໊ͷੜཱ͍ͪ ▶︎ ໊લղܾ ▶︎ ߏͱκʔϯ ▶︎ ϦιʔεϨίʔυ ▶︎
ίϯςϯπαʔό ▶︎ ελϒϦκϧό ͱϑϧαʔϏεϦκϧό ▶︎ DNS·ͱΊ
ίϯςϯπαʔόͱ ⾣ׂ ɾΫϥΠΞϯτͷ߹ͤʹϦιʔεϨίʔυԠ ɹɹˠݖҖαʔόͱɺͦͷηΧϯμϦαʔό ɾϦιʔεϨίʔυΛఏڙ͢Δଆ ɹɹˠϧʔτɺKQ 5-% ɺDP 4-% ɺNBNZɺFUD
ɾκʔϯϑΝΠϧͰϦιʔεϨίʔυཧ ɹɹˠࣗͷͷκʔϯʹؔ͢ΔใΛσʔλϕʔεԽ ɾΘ͔Βͳ͍߹ʮΘ͔ΒΜʯͱ͑Δ ɹɹˠυϝΠϯ͕·ͩऔಘ͞Εͯͳ͍ɺ/4Ϩίʔυ͕ͳ͍߹ͳͲ
ݖҖαʔό ⾣ϧʔταʔόੈքʹ ɹˠ6%1ͷ࠷େύέοταΠζʮCZUFʯʹऩ·Δݶք ⾣ϧʔτ͔ΒݖݶҕৡͰߏͰ໊લۭؒ ɹˠυϝΠϯͷͷαʔόͰࢄཧ ⾣໊લۭؒͷ%/4 ίϯςϯπ αʔό͕ݖҖαʔό ɹˠԠ͢Δଆ͕ͯ͢ݖҖαʔό ⾣Θ͔Βͳ͍߹ʮΘ͔ΒΜʯͱ͑Δ
ɹˠυϝΠϯ͕औಘ͞Εͯͳ͍ɺ/4Ϩίʔυ͕ͳ͍߹ͳͲ
ηΧϯμϦαʔό ⾣υϝΠϯʹରͭͩ͠ͱऑ͍ ϓϥΠϚϦ ɹˠෛՙ͔͔Δ͠ɺো͕ى͖Δͱ໊લղܾͰ͖ͳ͍ ⾣ηΧϯμϦαʔόͰߏ ɹˠϓϥΠϚϦͷκʔϯ ϑΝΠϧ ใΛҰఆظؒͰίϐʔ ⾣ηΧϯμϦͰཧԠ
ɹˠϓϥΠϚϦ͕ԠͰ͖ͳ͍߹
ϒϥβ͔Β Ͳ͏ͳͬͯΔ ΜͩͬͯΑ
͓͢Δ͜ͱ ▶︎ υϝΠϯ໊ͷੜཱ͍ͪ ▶︎ ໊લղܾ ▶︎ ߏͱκʔϯ ▶︎ ϦιʔεϨίʔυ ▶︎
ίϯςϯπαʔό ▶︎ ελϒϦκϧό ͱϑϧαʔϏεϦκϧό ▶︎ DNS·ͱΊ
ελϒϦκϧόͱ ⾣ΞϓϦέʔγϣϯ͔Β໊લղܾͷґཔΛड͚Δ ɹˠʢ1$ʣʹ࣮͞Ε͍ͯΔʢϒϥβͳͲ͔ΒݺΕΔʣ ⾣04໊͕࣋ͭલղܾͷιϑτΣΞ ɹˠΞϓϦέʔγϣϯͱϑϧαʔϏεϦκϧόͷڮ͠ தܧ ⾣࠶ؼ߹ͤ ɹˠ*1ΞυϨεΛಘΔ͔ɺυϝΠϯ͕ଘࡏ͠ͳ͍͔ΛಘΔ
ελϒϦκϧόͷಈ࡞ ΫϥΠΞϯτ Ϣʔβ ΞϓϦέʔγϣϯ ελϒϦκϧό %/4Ωϟογϡαʔό ϑϧαʔϏεϦκϧό
ελϒϦκϧόͷಈ࡞ ΫϥΠΞϯτ Ϣʔβ ΞϓϦέʔγϣϯ ελϒϦκϧό ᶃXXXNBNZKQʹ ɹ͋Δ8FCαΠτΛݟ͍ͨͳ %/4Ωϟογϡαʔό ϑϧαʔϏεϦκϧό
ελϒϦκϧόͷಈ࡞ ΫϥΠΞϯτ Ϣʔβ ΞϓϦέʔγϣϯ ελϒϦκϧό ᶃXXXNBNZKQʹ ɹ͋Δ8FCαΠτΛݟ͍ͨͳ ᶄXXXNBNZKQ ɹͰΘ͔Βͳ͍͔Β ɹ໊લղܾ͓ئ͍Ͷ
%/4Ωϟογϡαʔό ϑϧαʔϏεϦκϧό
ελϒϦκϧόͷಈ࡞ ΫϥΠΞϯτ Ϣʔβ ΞϓϦέʔγϣϯ ελϒϦκϧό ᶃXXXNBNZKQʹ ɹ͋Δ8FCαΠτΛݟ͍ͨͳ ᶄXXXNBNZKQ ɹͰΘ͔Βͳ͍͔Β ɹ໊લղܾ͓ئ͍Ͷ
ᶅXXXNBNZKQ ɹΛωʔϜαʔόʹ ɹ͍߹ΘͤΔΑ %/4Ωϟογϡαʔό ϑϧαʔϏεϦκϧό ͍߹Θͤ
ελϒϦκϧόͷಈ࡞ ΫϥΠΞϯτ Ϣʔβ ΞϓϦέʔγϣϯ ελϒϦκϧό ᶃXXXNBNZKQʹ ɹ͋Δ8FCαΠτΛݟ͍ͨͳ ᶄXXXNBNZKQ ɹͰΘ͔Βͳ͍͔Β ɹ໊લղܾ͓ئ͍Ͷ
ᶅXXXNBNZKQ ɹΛωʔϜαʔόʹ ɹ͍߹ΘͤΔΑ %/4Ωϟογϡαʔό ϑϧαʔϏεϦκϧό ͍߹Θͤ Ԡ ᶆԠΛड͚औͬͨͷͰ ɹ݁ՌΛ͢Α
ϑϧαʔϏεϦκϧόͱ ⾣ελϒϦκϧό͔Β໊લղܾͷґཔΛड͚Δ ɹˠҰൠతʹ*41ʢϓϩόΠμʣʹ͋Δʢͱࢥͬͱ͍ͯʣ ⾣෮߹ͤΛߦ͍*1ΞυϨεͷରԠ͚ͮ ɹˠϧʔτˠKQˠDPˠNBNZˠ*1ΞυϨεήοτ ɹɹ୯ಠͰɺ࠷ޙ·Ͱશʹ໊લղܾΛߦ͏ ⾣Ωϟογϡ͢Δ ɹˠ55-ͷ͚࣌ؒͩΩϟογϡΛ࣋ͭɻΏ͑ʹผ໊Ωϟογϡαʔό ⾣κʔϯใཧ͠ͳ͍ ɹˠ͋͘·Ͱ%/4ίϯςϯπαʔόʹ߹ͤ͢Δଆ
ͭ·Γ ·ͱΊΔͱʁ
͓͢Δ͜ͱ ▶︎ υϝΠϯ໊ͷੜཱ͍ͪ ▶︎ ໊લղܾ ▶︎ ߏͱκʔϯ ▶︎ ϦιʔεϨίʔυ ▶︎
ίϯςϯπαʔό ▶︎ ελϒϦκϧό ͱϑϧαʔϏεϦκϧό ▶︎ DNS·ͱΊ
%/4·ͱΊ ⾣Զ໊ͨͪલղܾͰੜ͔͞Ε͍ͯΔ ɹˠυϝΠϯ໊ͱ*1ΞυϨεɺߏɺκʔϯ ⾣໊લղܾʹϦιʔεϨίʔυ͕ඞཁ ɹˠ%/4 ίϯςϯπ αʔό͕ͷκʔϯΛཧ͍ͯ͠Δ ɹɹ/4ɺ"ɺ40"ɺ.9ɺ$/".&ɺͳͲ͕͋Δ ⾣ׂ͕͔Ε͍ͯΔ
ɹˠΞϓϦέʔγϣϯʢϒϥβͳͲʣɺελϒϦκϧόɺ ɹɹϑϧαʔϏεϦκϧόɺ%/4ίϯςϯπαʔόʢݖҖʣ
%/4·ͱΊ ⾣౷Ұ༷Ͱ࣮͞Εɺ࣮ݱ͞Ε͍ͯΔ ɹˠ*$"//ɺ+134 ϨδετϦ ɺ໊͓લ Ϩδετϥ ⾣ෛՙࢄোରࡦͰߏ ɹˠϓϥΠϚϦͱηΧϯμϦ
⾣ΩϟογϡΛϑϧ׆༻ ɹˠϑϧαʔϏεϦκϧόʢ%/4Ωϟογϡαʔόʣ ɹɹ͚ͩͰͳ͘ɺ༷ʑͳॴʹΩϟογϡʢ55-ʣ
%/4ා͘ͳ͍Αʂ
ʮΘ͔Βͳ͍ʯʹ دΓఴ͍͍ͨ %/4Λ͡ΊΑ͏ɹͷ ஶऀ͞Μ͔ΒҾ༻
͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ
ࢀߟจݙ ɾٕज़ॻయͰߪೖ ɾ#005)Ͱ1%'ൢചˏ= ɹɹIUUQTCPPUIQNKBJUFNT ɾʮ͔Βͳ͍ؾ࣋ͪʯʹدΓఴ͏ஶऀ ɾࣗવʹεοͱೖͬͯ͘Δ༰ ɾBNB[POͰߪೖ ɾ5$1*1ͷجૅ͔Β%/4ɺ'51ͳͲཏੑߴ͍ ɾݩʮؒωοτϫʔΩϯάʯ
ɹɹIUUQXXXFCJHMPCFOFKQBKJNJO ɾௐͳ͕Βਂ۷Γ͢Δຊ