{"id":54351,"date":"2019-12-24T00:00:00","date_gmt":"2019-12-23T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/istoriya-sistemy-domennyh-imen-pervye-dns-servery"},"modified":"2020-02-18T14:02:21","modified_gmt":"2020-02-18T11:02:21","slug":"istoriya-sistemy-domennyh-imen-pervye-dns-servery","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/administrirovanie\/istoriya-sistemy-domennyh-imen-pervye-dns-servery","title":{"rendered":"Historien om dom\u00e4nnamnssystemet: de f\u00f6rsta DNS-servrarna","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Senaste g\u00e5ngen b\u00f6rjade vi <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/479452\/\">ber\u00e4tta historien om DNS<\/a><\/noindex> \u2014 vi \u00e5terkallade hur projektet startade och vilka problem det var avsett att l\u00f6sa i ARPANET. Idag ska vi prata om den f\u00f6rsta DNS-servern BIND.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/480514\/\"><img decoding=\"async\" alt=\"Historien om dom\u00e4nnamnssystemet: de f\u00f6rsta DNS-servrarna\" src=\"\/wp-content\/uploads\/2019\/12\/c1e95bf16c7a3b9481ca75d102ac3edc.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>Foto \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flickr.com\/photos\/nhoj\/8856003234\">John Markos O&#8217;Neill<\/a><\/noindex> \u2014 CC BY-SA<\/i><\/p>\n<h2>De f\u00f6rsta DNS-servrarna<\/h2>\n<p>\nEfter att Paul Mockapetris och Jon Postel 1983\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc882\">f\u00f6reslog konceptet<\/a><\/noindex>\u00a0med dom\u00e4nnamn f\u00f6r ARPANET, fick det snabbt godk\u00e4nnande fr\u00e5n IT-gemenskapen. Bland de f\u00f6rsta som implementerade det i praktiken var ingenj\u00f6rer fr\u00e5n universitetet i Berkeley. \u00c5r 1984 presenterade fyra studenter den f\u00f6rsta DNS-servern \u2014 Berkeley Internet Name Domain (BIND). De arbetade p\u00e5 ett projekt som finansierades av det amerikanska f\u00f6rsvarsdepartementets avdelning f\u00f6r avancerade forskningsprojekt (DARPA).<\/p>\n<p>Systemet som utvecklades av universitetsstudenterna konverterade automatiskt DNS-namn till IP-adresser och vice versa. Intressant nog, n\u00e4r dess kod laddades upp till <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/BSD\">BSD<\/a><\/noindex> (programvarudistributionssystemet), hade de f\u00f6rsta k\u00e4llkoderna redan versionsnummer 4.3. Under en tid anv\u00e4ndes DNS-servern av anst\u00e4llda p\u00e5 universitetets laboratorier. Fram till version 4.8.3 var det forskargruppen vid universitetet i Berkeley \u2014 Computer Systems Research Group (CSRG) \u2014 som ansvarade f\u00f6r BINDs utveckling, men under andra halvan av 1980-talet br\u00f6t sig DNS-servern ut ur universitetet \u2014 den \u00f6verl\u00e4mnades till Paul Vixie fr\u00e5n f\u00f6retaget\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Digital_Equipment_Corporation\">DEC<\/a><\/noindex>. Paul sl\u00e4ppte uppdateringar 4.9 och 4.9.1, och grundade sedan Internet Software Consortium (ISC), som sedan dess ansvarar f\u00f6r supporten av BIND. Enligt Paul baserades alla tidigare versioner p\u00e5 koden fr\u00e5n studenterna i Berkeley, och under de senaste femton \u00e5ren har den helt utt\u00f6mt sina m\u00f6jligheter att moderniseras. D\u00e4rf\u00f6r skrev man om BIND fr\u00e5n grunden \u00e5r 2000.<\/p>\n<blockquote><p>BIND-servern inkluderar flera bibliotek och komponenter som implementerar DNS:s 'klient-server'-arkitektur och ansvarar f\u00f6r konfigurationen av DNS-serverns funktioner. BIND \u00e4r allm\u00e4nt spridd, s\u00e4rskilt p\u00e5 Linux, och f\u00f6rblir en popul\u00e4r implementation av DNS-servrar. Det <noindex><a rel=\"nofollow\" href=\"https:\/\/www.isc.org\/download\/\">beslutet<\/a><\/noindex> \u00e4r installerat p\u00e5 servrar som tillhandah\u00e5ller st\u00f6d f\u00f6r <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9A%D0%BE%D1%80%D0%BD%D0%B5%D0%B2%D1%8B%D0%B5_%D1%81%D0%B5%D1%80%D0%B2%D0%B5%D1%80%D1%8B_DNS\">rotszonen<\/a><\/noindex>.<\/p><\/blockquote>\n<p>\nDet finns alternativ till BIND. Till exempel, PowerDNS, som ing\u00e5r i Linux-distributioner. Den \u00e4r skriven av Bert Hubert fr\u00e5n det holl\u00e4ndska f\u00f6retaget PowerDNS.COM och st\u00f6ds av \u00f6ppen k\u00e4llkod gemenskap. \u00c5r 2005 implementerades PowerDNS p\u00e5 servrarna f\u00f6r Wikimedia Foundation. L\u00f6sningen anv\u00e4nds ocks\u00e5 av stora molnleverant\u00f6rer, europeiska telekommunikationsf\u00f6retag och organisationer p\u00e5 Fortune 500-listan.<\/p>\n<p>BIND och PowerDNS \u00e4r n\u00e5gra av de mest spridda, men inte de enda DNS-servrarna. Det \u00e4r ocks\u00e5 v\u00e4rt att n\u00e4mna\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/NLnetLabs\/unbound\">Unbound<\/a><\/noindex>,\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Djbdns\">djbdns<\/a><\/noindex> och\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Dnsmasq\">Dnsmasq<\/a><\/noindex>.<\/p>\n<h2>Utvecklingen av dom\u00e4nnamnssystemet<\/h2>\n<p>\nUnder hela historien av DNS har dess specifikation genomg\u00e5tt m\u00e5nga f\u00f6r\u00e4ndringar. Som en av de f\u00f6rsta och stora uppdateringarna\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc1996\">lagt till<\/a><\/noindex>\u00a0inf\u00f6rdes mekanismerna NOTIFY och IXFR \u00e5r 1996. De f\u00f6renklade replikeringen av dom\u00e4nnamnsdatabaser mellan prim\u00e4ra och sekund\u00e4ra servrar. Den nya l\u00f6sningen m\u00f6jliggjorde inst\u00e4llning av notifieringar om \u00e4ndringar av DNS-poster. Detta tillv\u00e4gag\u00e5ngss\u00e4tt garanterade identitet mellan den sekund\u00e4ra och prim\u00e4ra DNS-zonen plus sparade trafik \u2014 synkroniseringen skedde endast vid behov, och inte genom fasta intervall.<\/p>\n<p><img decoding=\"async\" alt=\"Historien om dom\u00e4nnamnssystemet: de f\u00f6rsta DNS-servrarna\" src=\"\/wp-content\/uploads\/2019\/12\/f9c27f2dfe738274503bdd95ca32bce5.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Foto \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flickr.com\/photos\/bike\/266453254\">Richard Masoner<\/a><\/noindex> \u2014 CC BY-SA<\/i><\/p>\n<p>Fr\u00e5n b\u00f6rjan var DNS-n\u00e4tverket inte tillg\u00e4ngligt f\u00f6r allm\u00e4nheten och potentiella problem med informationss\u00e4kerhet var inte en prioritet vid systemets utveckling, men detta tillv\u00e4gag\u00e5ngss\u00e4tt visade sig senare. Med internetutvecklingen b\u00f6rjade s\u00e5rbarheterna utnyttjas \u2014 exempelvis uppkom attacker som DNS-spoofing. I detta fall fylls DNS-servrarnas cache med data utan auktoritativ k\u00e4lla och omdirigerar f\u00f6rfr\u00e5gningar till angriparnas servrar.<\/p>\n<p>F\u00f6r att l\u00f6sa problemet introducerades i DNS\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/www.icann.org\/resources\/pages\/dnssec-what-is-it-why-important-2019-03-05-en\">integration med Mastodon, vilket orsakade blandade reaktioner fr\u00e5n anv\u00e4ndarna. Lyckligtvis \u00e4r det, precis som det b\u00f6r vara i \u00f6ppen k\u00e4llkod, valfritt och hanteras p\u00e5 serveradministrat\u00f6rens sida.<\/a><\/noindex>\u00a0kryptografiska signaturer f\u00f6r DNS-svar (DNSSEC) \u2014 en mekanism som m\u00f6jligg\u00f6r skapandet av en kedja av tillit f\u00f6r dom\u00e4nen fr\u00e5n rotzonen. Det b\u00f6r noteras att en liknande mekanism lades till f\u00f6r autentisering av v\u00e4rdar vid \u00f6verf\u00f6ring av DNS-zonen \u2014 den fick namnet TSIG.<\/p>\n<p>Modifieringar som f\u00f6renklar replikeringen av dom\u00e4ner och \u00e5tg\u00e4rdar s\u00e4kerhetsproblem v\u00e4lkomnades av IT-gemenskapen. Men det fanns \u00e4ven f\u00f6r\u00e4ndringar som gemenskapen uppfattade negativt. Specifikt \u00f6verg\u00e5ngen fr\u00e5n gratis till betalda dom\u00e4nnamn. Och detta \u00e4r bara ett exempel p\u00e5 en av \"krigen\" i DNS:s historia. Mer om detta kommer vi att diskutera i n\u00e4sta artikel.<\/p>\n<p><img decoding=\"async\" alt=\"Historien om dom\u00e4nnamnssystemet: de f\u00f6rsta DNS-servrarna\" src=\"\/wp-content\/uploads\/2019\/12\/1f42acb7d2b0e01063a51c01ecc08be6.jpg\" style=\"display:block;margin: 0 auto;\" \/>Vi p\u00e5 1cloud erbjuder tj\u00e4nsten \"<noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/services\/vps-vds?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=dns2&amp;utm_content=site\">Virtuell server<\/a><\/noindex>\", som g\u00f6r det m\u00f6jligt att hyra och konfigurera en fj\u00e4rr VDS\/VPS-server p\u00e5 bara ett par minuter.<br \/>\n<img decoding=\"async\" alt=\"Historien om dom\u00e4nnamnssystemet: de f\u00f6rsta DNS-servrarna\" src=\"\/wp-content\/uploads\/2019\/12\/83e0fdbcbe67addee00c0938949e6f7e.jpg\" style=\"display:block;margin: 0 auto;\" \/>Det finns ocks\u00e5 <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/conditions\/referral?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=dns2&amp;utm_content=site\">partnerskapsprogrammet<\/a><\/noindex> f\u00f6r alla anv\u00e4ndare. Placera referensl\u00e4nkar till v\u00e5r tj\u00e4nst och f\u00e5 bel\u00f6ningar f\u00f6r kunder du h\u00e4nvisar.<\/p>\n<p>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/480514\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u0440\u043e\u0448\u043b\u044b\u0439 \u0440\u0430\u0437 \u043c\u044b \u043d\u0430\u0447\u0430\u043b\u0438 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0442\u044c \u0438\u0441\u0442\u043e\u0440\u0438\u044e DNS \u2014 \u0432\u0441\u043f\u043e\u043c\u043d\u0438\u043b\u0438, \u0441 \u0447\u0435\u0433\u043e \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u0430\u043b \u043f\u0440\u043e\u0435\u043a\u0442, \u0438 \u043a\u0430\u043a\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0431\u044b\u043b \u043f\u0440\u0438\u0437\u0432\u0430\u043d \u0440\u0435\u0448\u0438\u0442\u044c \u0432 \u0441\u0435\u0442\u0438 ARPANET. \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u043f\u043e\u0433\u043e\u0432\u043e\u0440\u0438\u043c \u043e \u043f\u0435\u0440\u0432\u043e\u043c DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0435 BIND. \u0424\u043e\u0442\u043e \u2014 John Markos O&#8217;Neill \u2014 CC BY-SA \u041f\u0435\u0440\u0432\u044b\u0435 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u044b \u041f\u043e\u0441\u043b\u0435 \u0442\u043e\u0433\u043e \u043a\u0430\u043a \u0432 1983 \u0433\u043e\u0434\u0443 \u041f\u043e\u043b \u041c\u043e\u043a\u0430\u043f\u0435\u0442\u0440\u0438\u0441 (Paul Mockapetris) \u0438 \u0414\u0436\u043e\u043d \u041f\u043e\u0441\u0442\u0435\u043b (Jon Postel)\u00a0\u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b\u0438 \u043a\u043e\u043d\u0446\u0435\u043f\u0446\u0438\u044e\u00a0\u0434\u043e\u043c\u0435\u043d\u043d\u044b\u0445 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-54351","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u0440\u043e\u0448\u043b\u044b\u0439 \u0440\u0430\u0437 \u043c\u044b \u043d\u0430\u0447\u0430\u043b\u0438 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0442\u044c \u0438\u0441\u0442\u043e\u0440\u0438\u044e DNS \u2014 \u0432\u0441\u043f\u043e\u043c\u043d\u0438\u043b\u0438, \u0441 \u0447\u0435\u0433\u043e \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u0430\u043b \u043f\u0440\u043e\u0435\u043a\u0442, \u0438 \u043a\u0430\u043a\u0438\u0435 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