basics_of_dns_that_phper_should_know

1)1FS͕஌Δ΂͖ %/4ͷ͖΄Μ ·Έ΍ͳ͓͖ !NBNZ "QSୈճ1)1ษڧձˏ౦ژ

ࣗݾ঺հ Name ɿ·Έ΍ͳ͓͖ ॴଐɹ ɿInnovator Japan Inc. Twitterɿ@mamy1326 - ීஈ͸PHPॻ͍ͯ·͢
- 2018೥3݄ʹDNSͷษڧΛ࢝ΊΔ - ࠓ೥1೥ωοτϫʔΫ͕ςʔϚ

ຊ೔ ࣋ͪؼͬͯ ͍ͨͩ͘͜ͱ

%/4ා͘ͳ͍ʂ Λ఻͍͑ͨ

งғؾͰ υϝΠϯ໊΍ %/4Λ΍ͬͯΔਓ͕

͜Μͳ͜ͱͯ͠ΔΑ ͱݴ͏جຊͷҰ෦Λ ஌Δ͜ͱͰ

υϝΠϯ໊ͱ *1ΞυϨεΛ લΑΓ্ख͘ѻ͑ͯ

ࠓΑΓ΋ͬͱ ָ͘͠ͳΔ͖͔͚ͬ ʹ͍ͨ͠

ɹɹେ׻ܴ

͓࿩͢Δ͜ͱ ▶︎ υϝΠϯ໊ͷੜཱ͍ͪ ▶︎ ໊લղܾ ▶︎ ໦ߏ଄ͱκʔϯ ▶︎ 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 ϒϥ΢β 8FCαʔό %/4͕ͳ͍৔߹

⾣8FCαΠτΛݟ͍ͨ XXXIPOOPKJOPIFOKQ Πϯλʔωοπ υϝΠϯ໊ࢦఆ͠ ɹɹίϯςϯπΛϦΫΤετ⾣ ϒϥ΢β 8FCαʔό %/4͕ͳ͍৔߹

⾣8FCαΠτΛݟ͍ͨ XXXIPOOPKJOPIFOKQ Πϯλʔωοπ υϝΠϯ໊ࢦఆ͠ ɹɹίϯςϯπΛϦΫΤετ⾣ ࠓɺຊೳࣉ͕ ೤͍ ϒϥ΢β 8FCαʔό %/4͕ͳ͍৔߹

⾣8FCαΠτΛݟ͍ͨ XXXIPOOPKJOPIFOKQ Πϯλʔωοπ υϝΠϯ໊ࢦఆ͠ ɹɹίϯςϯπΛϦΫΤετ⾣ ϦΫΤετ͕ಧ͔ͳ͍ͷͰ ೤͞Λ఻͑ΒΕͳ͍ ࠓɺຊೳࣉ͕ ೤͍ ϒϥ΢β
8FCαʔό %/4͕ͳ͍৔߹

ຊདྷ *1ΞυϨεΛ ࢦఆ͢΂͖

͔͠͠ ਓؒ͸ ਺ࣈ͕ۤख

⾣υϝΠϯ໊Λ࢖͏ཧ༝ ɾਓؒ͸֮͑ΒΕͳ͍ ɹˠͱ͔਺ࣈͷཏྻ ɾ*1ΞυϨεͰ͸ҙຯΛදݱͰ͖ͳ͍ ͦ͜ͰυϝΠϯ໊ͷొ৔ 8FC΋ϝʔϧ΋υϝΠϯ໊ࢦఆ

⾣υϝΠϯ໊ͷϝϦοτ ɾ֮͑΍͍͢ʂ ɹˠXXXIPOOPKJOPIFOKQͳΔ΄Ͳຊೳࣉ ɾαʔϏεʹ߹໊ͬͨલΛબ୒ *1ΞυϨεͷ୅ΘΓʹ ѼઌࢦఆͷจࣈྻʹυϝΠϯ໊ 8FC΋ϝʔϧ΋υϝΠϯ໊ࢦఆ

υϝΠϯ໊ͱ *1ΞυϨεΛ ؔ࿈͚ͮΔඞཁ͕͋Δ

%PNBJO/BNF4ZTUFN ⾣υϝΠϯ໊ͱ*1ΞυϨεΛඥ෇͚ ɾॅॴͰ͋Δ*1ΞυϨε͕Θ͔Βͳ͍ ɹɹˠαʔϏεड͚ΒΕͳ͍ ɾυϝΠϯ໊Λ໰߹ͤ ɹɹˠ*1ΞυϨεΛԠ౴ %/4Ͱ໊લղܾ

໊લղܾ ⾣ͬ͘͟Γͱͨ͠࢓૊Έ ɾυϝΠϯ໊ͷ*1ΞυϨεΛղܾ͢Δ࢓૊Έ ɹɹˠͦΕҎ֎ͷ໾ׂ͸ࠓճ͸࿩͠·ͤΜ ɾ୆ͷʮ%/4ݖҖαʔόʯʴଟ਺ͷηΧϯμϦ ɹɹˠ%/4ίϯςϯπαʔό ɾϒϥ΢β͕04ͷιϑτ΢ΣΞ΁໊લղܾΛґཔ ɹɹˠґཔ͞ΕΔͷ͸ελϒϦκϧό ɾ%/4αʔόʹ໰߹໊ͤͯલղܾ ɹɹˠϑϧαʔϏεϦκϧό

ελϒϦκϧό ϩʔΧϧͷ %/4αʔό ࠶ؼݕࡧ ᶃXXXNBNZKQΛϒϥ΢βͰ࣮ߦ %/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͸ ᶌ8FCϒϥ΢β͕ʹΞΫηε⾣ ᶄXXXNBNZKQ ɹͷ*1ΞυϨε͸ʁ˝ %/4ίϯςϯπαʔό ໊લղܾͷྲྀΕ

%/4͸ॏཁͳΠϯϑϥ Ϣʔβ αʔό Πϯλʔωοτ Πϯλʔωοτ্ͷ αʔϏεΛड͚͍ͨ Ѽઌͷࢦఆ ⾣Ѽઌͷࢦఆ

%/4͸ॏཁͳΠϯϑϥ ⾣Ѽઌ͸υϝΠϯ໊ ɹ̴̬̱αʔϏεʜʜʜIUUQTXXXNBNZDPN ɹిࢠϝʔϧʜʜʜʜʜJOGP!NBNZDPN ɹϑΝΠϧసૹʜʜʜʜGUQGUQNBNZDPN υϝΠϯ໊͕͋Δ͔ΒαʔϏε͕ड͚ΒΕΔ ʹ %/4͸ΠϯλʔωοτͷΠϯϑϥ

υϝΠϯ໊͸ Ͳ͏؅ཧ͞ΕΔͷ͔

KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL DPN
ϧʔτ EOT HBNF υϝΠϯ໊͸໦ߏ଄

υϝΠϯ໊͸໦ߏ଄ KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL
DPN ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ

ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ υϝΠϯ໊͸໦ߏ଄

ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ υϝΠϯ໊͸໦ߏ଄

ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ໦ߏ଄Λ ൓෮໰߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ υϝΠϯ໊͸໦ߏ଄

ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ໦ߏ଄Λ ൓෮໰߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ 5PQ-FWFM%PNBJO Λ؅ཧ τοϓϨϕϧυϝΠϯ υϝΠϯ໊͸໦ߏ଄

ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ໦ߏ଄Λ ൓෮໰߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ KQυϝΠϯ Λ؅ཧ υϝΠϯ໊͸໦ߏ଄

ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ໦ߏ଄Λ ൓෮໰߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ DPKQυϝΠϯ Λ؅ཧ υϝΠϯ໊͸໦ߏ଄

ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ໦ߏ଄Λ ൓෮໰߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ NBNZDPKQ υϝΠϯΛ؅ཧ υϝΠϯ໊͸໦ߏ଄

ʜ%/4 ɹίϯςϯπαʔό ϧʔτ EOT HBNF ໦ߏ଄Λ ൓෮໰߹ͤͰḷΔ 8FCαʔό EOTTUVEZNBNZDPKQ TUVEZNBNZDPKQ υϝΠϯΛ؅ཧ υϝΠϯ໊͸໦ߏ଄

ϧʔτ EOT HBNF ໊લۭؒ υϝΠϯ໊͸໦ߏ଄

໦ߏ଄ͱκʔϯ KQ OFU DP BD NBNZ NBNZ TUVEZ IPCCZ VL
DPN ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ

DPN ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ ϧʔτͷ ωʔϜαʔό ͷκʔϯ

DPN ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ KQͷ ωʔϜαʔόͷκʔϯ

DPN DPKQͷ ωʔϜαʔόͷκʔϯ ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ

DPN NBNZDPKQͷ ωʔϜαʔόͷκʔϯ ϧʔτ EOT HBNF 8FCαʔό EOTTUVEZNBNZDPKQ

໦ߏ଄ͱκʔϯ ⾣υϝΠϯ໊ิ଍ ɾυϝΠϯ໊͸ӈ͔Βղऍ ɹˠτοϓ ˠKQˠDPˠNBNZˠʜ ɾKQυϝΠϯ͸+134؅׋ +B1BO3FHJTUSZ4FSWJDFT ɹˠKQυϝΠϯͷ૯ݩకΊ
ɾඇӦརஂମ*$"// *OUFSOFU$PSQPSBUJPOGPS"TTJHOFE/BNFTBOE/VNCFST ɹˠυϝΠϯͱ*1ΞυϨεͷ૯ݩకΊ

໦ߏ଄ͱκʔϯ ⾣κʔϯิ଍ ɾ؅׋υϝΠϯͷ૚͕κʔϯ ɹˠ53*$,ʹग़ͯ͘Δ୯ޠͰ͸ͳ͍ ɾκʔϯʹ͸%/4ίϯςϯπαʔό͕͋Δ ɹˠ൓෮ݕࡧͰͭͳ͍Ͱߦ͘ ɾجຊతʹࣗ෼ͷκʔϯ͚ͩΛ؅ཧ ɹˠκʔϯϑΝΠϧͷهड़ʹΑͬͯ͸ෳ਺؅ཧ

κʔϯϑΝΠϧͷ த਎ͷ࿩

໊લղܾͷԠ౴ ⾣Ԡ౴͢Δ৘ใ͕ඞཁ ɾ໊લղܾͷԠ౴༻ϨίʔυΛ࣋ͭ ɹɹˠ֤%/4ίϯςϯπαʔόͰσʔλϕʔεԽ ɾυϝΠϯ໊ͷ໰߹ͤʹԠ౴͢Δ ɹɹˠ໊લղܾͰ͖Δ Ԡ౴͢ΔϨίʔυΛ ϦιʔεϨίʔυͱݺͿ

ϦιʔεϨίʔυ ⾣%/4ίϯςϯπαʔό͕؅ཧ ɾσʔλϕʔεԽ͞ΕͨκʔϯϑΝΠϧͷத਎ ɹˠ؅ཧԼͷϗετʢαʔόʣͳͲͷ৘ใ ɾܾ·ͬͨϑΥʔϚοτ͕͋Δ ɹˠυϝΠϯ໊ɺϗετ໊ɺछྨɺઃఆ஋ ɾ༻్ʹԠ༷ͯ͡ʑͳछྨ͕͋Δ ɹˠ/4ɺ"ɺ$/".&ɺ.9ɺ40"ɺͳͲͳͲ ɹɹ"84ͩͱ3PVUFʹొ࿥͢Δ

୅දతͳ ϦιʔεϨίʔυ ʢ/4ɺ"ʣ

/4 /BNF4FSWFS Ϩίʔυ ⾣υϝΠϯ໊ͷ໰͍߹ΘͤઌΛද͢ ɾ؅ཧ͍ͯ͠Δ%/4ίϯςϯπαʔόͷҕୗઌ ɹˠυϝΠϯ໊NBNZKQ͸͜ͷ%/4αʔόʹฉ͍ͯ͘Ε ɾ/4ϨίʔυΛυϝΠϯ໊ʹؔ࿈͚ͮΔ ɹˠυϝΠϯ໊Λऔಘͨ͠ͱ͜Ζʹ໊લղܾઌΛొ࿥ ɾྫɿ໊͓લͷυϝΠϯ໊ͷ%/4Λ"84Ͱ؅ཧ͍ͨ͠ ɹˠᶃ3PVUFʹ)PTUFE[POF
؅ཧ͍ͨ͠υϝΠϯ໊ Λొ࿥ ɹɹᶄ/4Ϩίʔυ͕ҰఆͷϧʔϧͰ࡞ΒΕɺ%/4αʔόׂΓ౰ͯ ɹɹᶅ%/4αʔό໊Λ໊͓લͷ֘౰υϝΠϯ໊ʹొ࿥

⾣ओͳϑΥʔϚοτ ໊લ λΠϓ 55- σʔλ 3%"5" NBNZKQ /4 OTBXTEOTDPN
/4 /BNF4FSWFS Ϩίʔυ ɾ໊લ ɹɹˠϦιʔεϨίʔυͷ໊લɻ/4ͷ৔߹͸υϝΠϯ໊ͱͳΔ ɾλΠϓ ɹɹˠϦιʔεϨίʔυΛࣝผ͢ΔλΠϓɻ/4͸ωʔϜαʔόʔΛද͢ 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 ɹˠυϝΠϯ໊؅ཧͷҕୗઌ͕ෆ໌ʹ໊લղܾͰ͖ͳ͍ ⾣"Ϩίʔυ͕ͳ͍ͱʁ ɾαʔϏε͍ͯ͠Δαʔό͕Θ͔Βͳ͍ ɹˠ*1ΞυϨεΛԠ౴Ͱ͖ͳ͍ʹαʔϏεͰ͖ͳ͍

Ͱʁ %/4ίϯςϯπαʔό ͬͯԿʁ

ίϯςϯπαʔόͱ͸ ⾣໾ׂ ɾΫϥΠΞϯτͷ໰߹ͤʹϦιʔεϨίʔυԠ౴ ɹɹˠݖҖαʔόͱɺͦͷηΧϯμϦαʔό ɾϦιʔεϨίʔυΛఏڙ͢Δଆ ɹɹˠϧʔτɺKQ 5-% ɺDP 4-% ɺNBNZɺFUD
ɾκʔϯϑΝΠϧͰϦιʔεϨίʔυ؅ཧ ɹɹˠࣗ෼ͷ؅׋ͷκʔϯʹؔ͢Δ৘ใΛσʔλϕʔεԽ ɾΘ͔Βͳ͍৔߹͸ʮΘ͔ΒΜʯͱ౴͑Δ ɹɹˠυϝΠϯ͕·ͩऔಘ͞Εͯͳ͍ɺ/4Ϩίʔυ͕ͳ͍৔߹ͳͲ

ݖҖαʔό ⾣ϧʔταʔό͸ੈքʹ୆ ɹˠ6%1ͷ࠷େύέοταΠζʮCZUFʯʹऩ·Δݶք ⾣ϧʔτ͔ΒݖݶҕৡͰ໦ߏ଄Ͱ໊લۭؒ ɹˠυϝΠϯͷ਺ͷαʔόͰ෼ࢄ؅ཧ ⾣໊લۭؒͷ%/4 ίϯςϯπ αʔό͕ݖҖαʔό ɹˠԠ౴͢Δଆ͢΂͕ͯݖҖαʔό ⾣Θ͔Βͳ͍৔߹͸ʮΘ͔ΒΜʯͱ౴͑Δ
ɹˠυϝΠϯ͕औಘ͞Εͯͳ͍ɺ/4Ϩίʔυ͕ͳ͍৔߹ͳͲ

ηΧϯμϦαʔό ⾣υϝΠϯʹରͭͩ͠ͱऑ͍ ϓϥΠϚϦ ɹˠෛՙ΋͔͔Δ͠ɺো֐͕ى͖Δͱ໊લղܾͰ͖ͳ͍ ⾣ηΧϯμϦαʔόͰ৑௕ߏ੒ ɹˠϓϥΠϚϦͷκʔϯ ϑΝΠϧ ৘ใΛҰఆظؒͰίϐʔ ⾣ηΧϯμϦͰ୅ཧԠ౴
ɹˠϓϥΠϚϦ͕Ԡ౴Ͱ͖ͳ͍৔߹

ϒϥ΢β͔Β͸ Ͳ͏ͳͬͯΔ Μͩͬͯ͹Α

ελϒϦκϧόͱ͸ ⾣ΞϓϦέʔγϣϯ͔Β໊લղܾͷґཔΛड͚Δ ɹˠ୺຤ʢ1$ʣʹ࣮૷͞Ε͍ͯΔʢϒϥ΢βͳͲ͔Βݺ͹ΕΔʣ ⾣04໊͕࣋ͭલղܾͷιϑτ΢ΣΞ ɹˠΞϓϦέʔγϣϯͱϑϧαʔϏεϦκϧόͷڮ౉͠ 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 ɹͰ͸Θ͔Βͳ͍͔Β ɹ໊લղܾ͓ئ͍Ͷ
%/4Ωϟογϡαʔό ϑϧαʔϏεϦκϧό

ᶅXXXNBNZKQ ɹΛωʔϜαʔόʹ ɹ໰͍߹ΘͤΔΑ %/4Ωϟογϡαʔό ϑϧαʔϏεϦκϧό ໰͍߹Θͤ

ᶅXXXNBNZKQ ɹΛωʔϜαʔόʹ ɹ໰͍߹ΘͤΔΑ %/4Ωϟογϡαʔό ϑϧαʔϏεϦκϧό ໰͍߹Θͤ Ԡ౴ ᶆԠ౴Λड͚औͬͨͷͰ ɹ݁ՌΛ౉͢Α

ϑϧαʔϏεϦκϧόͱ͸ ⾣ελϒϦκϧό͔Β໊લղܾͷґཔΛड͚Δ ɹˠҰൠతʹ*41ʢϓϩόΠμʣʹ͋Δʢͱࢥͬͱ͍ͯʣ ⾣൓෮໰߹ͤΛߦ͍*1ΞυϨεͷରԠ͚ͮ ɹˠϧʔτˠKQˠDPˠNBNZˠ*1ΞυϨεήοτ ɹɹ୯ಠͰɺ࠷ޙ·Ͱ׬શʹ໊લղܾΛߦ͏ ⾣Ωϟογϡ͢Δ ɹˠ55-ͷ͚࣌ؒͩΩϟογϡΛ࣋ͭɻΏ͑ʹผ໊Ωϟογϡαʔό ⾣κʔϯ৘ใ͸؅ཧ͠ͳ͍ ɹˠ͋͘·Ͱ΋%/4ίϯςϯπαʔόʹ໰߹ͤ͢Δଆ

ͭ·Γ ·ͱΊΔͱʁ

%/4·ͱΊ ⾣Զͨͪ͸໊લղܾͰੜ͔͞Ε͍ͯΔ ɹˠυϝΠϯ໊ͱ*1ΞυϨεɺ໦ߏ଄ɺκʔϯ ⾣໊લղܾʹ͸ϦιʔεϨίʔυ͕ඞཁ ɹˠ%/4 ίϯςϯπ αʔό͕؅׋ͷκʔϯΛ؅ཧ͍ͯ͠Δ ɹɹ/4ɺ"ɺ40"ɺ.9ɺ$/".&ɺͳͲ͕͋Δ ⾣໾ׂ͕෼͔Ε͍ͯΔ
ɹˠΞϓϦέʔγϣϯʢϒϥ΢βͳͲʣɺελϒϦκϧόɺ ɹɹϑϧαʔϏεϦκϧόɺ%/4ίϯςϯπαʔόʢݖҖʣ

%/4·ͱΊ ⾣౷Ұ࢓༷Ͱ࣮૷͞Εɺ࣮ݱ͞Ε͍ͯΔ ɹˠ*$"//ɺ+134 ϨδετϦ ɺ໊͓લ Ϩδετϥ ⾣ෛՙ෼ࢄ΍ো֐ରࡦͰ৑௕ߏ੒ ɹˠϓϥΠϚϦͱηΧϯμϦ
⾣ΩϟογϡΛϑϧ׆༻ ɹˠϑϧαʔϏεϦκϧόʢ%/4Ωϟογϡαʔόʣ ɹɹ͚ͩͰͳ͘ɺ༷ʑͳ৔ॴʹΩϟογϡʢ55-ʣ

%/4͸ා͘ͳ͍Αʂ

ʮΘ͔Βͳ͍ʯʹ دΓఴ͍͍ͨ %/4Λ͸͡ΊΑ͏ɹͷ ஶऀ͞Μ͔ΒҾ༻

͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ

ࢀߟจݙ ɾٕज़ॻయͰߪೖ ɾ#005)Ͱ΋1%'ൢചˏ= ɹɹIUUQTCPPUIQNKBJUFNT ɾʮ෼͔Βͳ͍ؾ࣋ͪʯʹدΓఴ͏ஶऀ ɾࣗવʹεοͱೖͬͯ͘Δ಺༰ ɾBNB[POͰߪೖ ɾ5$1*1ͷجૅ͔Β%/4ɺ'51ͳͲ໢ཏੑߴ͍ ɾݩ͸ʮ෼ؒωοτϫʔΩϯάʯ
ɹɹIUUQXXXFCJHMPCFOFKQBKJNJO ɾௐ΂ͳ͕Βਂ۷Γ͢Δຊ

basics_of_dns_that_phper_should_know

basics_of_dns_that_phper_should_know

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