{"id":36854,"date":"2019-10-31T22:14:15","date_gmt":"2019-10-31T19:14:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/retrospektiva-kak-istoshhalis-adresa-ipv4\/"},"modified":"2019-10-31T22:14:15","modified_gmt":"2019-10-31T19:14:15","slug":"retrospektiva-kak-istoshhalis-adresa-ipv4","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/administrirovanie\/retrospektiva-kak-istoshhalis-adresa-ipv4","title":{"rendered":"Tilbageblik: hvordan IPv4-adresser blev udt\u00f8mt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Geoff Huston, Chief Research Engineer hos internetregistratoren APNIC, foruds\u00e5, at IPv4-adresser ville v\u00e6re udt\u00f8mt i 2020. I en ny cyklus af materialer vil vi opdatere informationen om, hvordan adresserne blev udt\u00f8mt, hvem der stadig har dem, og hvorfor det skete.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/462435\/\"><img decoding=\"async\" alt=\"Tilbageblik: hvordan IPv4-adresser blev udt\u00f8mt\" src=\"\/wp-content\/uploads\/2019\/08\/b1bf313f07dff7552813a1e71d4f8bfe.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>\/ Unsplash \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/unsplash.com\/photos\/EKnd0HcEyCM\">Lo\u00efc Mermilliod<\/a><\/noindex><\/i><\/p>\n<h2>Hvorfor adresserne slipper op<\/h2>\n<p>\nF\u00f8r vi g\u00e5r videre til historien om, hvordan IPv4-poolen blev 't\u00f8rret', lad os tale lidt om \u00e5rsagerne. I 1983, da TCP\/IP blev implementeret, blev der anvendt 32-bit adressering. Dengang <noindex><a rel=\"nofollow\" href=\"https:\/\/blogs.igalia.com\/dpino\/2017\/05\/25\/ipv4-exhaustion\/\">syntes<\/a><\/noindex>, at 4,3 milliarder adresser til 4,5 milliarder mennesker var mere end tilstr\u00e6kkeligt. Men p\u00e5 det tidspunkt tog udviklerne ikke h\u00f8jde for, at verdens befolkning ville fordobles, og at internettet ville blive bredt udbredt.<\/p>\n<p>I 80'erne fik mange organisationer flere adresser, end de reelt havde brug for. Nogle virksomheder anvender stadig offentlige adresser til servere, der kun fungerer i lokale netv\u00e6rk. Udbredelsen af mobile teknologier, internettet af tingene og virtualisering har yderligere forv\u00e6rret situationen. Fejl i vurderingen af antallet af v\u00e6rter i det globale netv\u00e6rk og ineffektiv adressefordeling blev \u00e5rsagen til IPv4-manglen.<\/p>\n<h2>Hvordan adresserne blev udt\u00f8mte<\/h2>\n<p>\nI starten af 00'erne udtalte Paul Wilson, direkt\u00f8r for APNIC, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.cnet.com\/news\/exec-no-shortage-of-net-addresses\/\">at IPv4-adresser ville l\u00f8be t\u00f8r inden for de n\u00e6ste ti \u00e5r. Generelt viste hans forudsigelse sig at v\u00e6re ret pr\u00e6cis.<\/a><\/noindex>2011:<\/p>\n<p><b>Som forudsagt af Wilson, havde internetregistratoren APNIC (der d\u00e6kker Asien-Stillehavsomr\u00e5det) den sidste<\/b> blok \/8. <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Beskclasset_adressering\">Organisationen indf\u00f8rte en ny regel \u2014 \u00e9n blok p\u00e5 1024 adresser \u2018per person\u2019. Analytikere siger, at uden denne begr\u00e6nsning ville blok \/8 v\u00e6re udt\u00f8mt p\u00e5 en m\u00e5ned. Nu er der kun et lille antal adresser tilbage hos APNIC.<\/a><\/noindex>2012:<\/p>\n<p><b>Den europ\u00e6iske internetregistrator RIPE erkl\u00e6rede ogs\u00e5, at puljen var udt\u00f8mt. De begyndte ogs\u00e5 at distribuere den sidste blok \/8. Organisationen fulgte APNICs eksempel og indf\u00f8rte strenge begr\u00e6nsninger p\u00e5 udlevering af IPv4. I 2015 havde RIPE kun 16 millioner ledige adresser tilbage. I dag er dette tal betydeligt reduceret \u2014<\/b> til 3,5 millioner. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ripe.net\/publications\/ipv6-info-centre\/about-ipv6\/ipv4-exhaustion\/ipv4-available-pool\">Det skal bem\u00e6rkes, at i 2012<\/a><\/noindex>skete den globale lancering af IPv6. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.worldipv6launch.org\/\">den verdensomsp\u00e6ndende lancering af IPv6 fandt sted<\/a><\/noindex>. Verdens teleoperat\u00f8rer har aktiveret en ny protokol for en del af deres kunder. Blandt de f\u00f8rste var AT&amp;T, Comcast, Free Telecom, Internode, XS4ALL osv. Samtidig har Cisco og D-Link aktiveret IPv6 som standard i indstillingerne for deres routere.<\/p>\n<blockquote><p><b>Et par friske indl\u00e6g fra vores blog p\u00e5 Habr:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/461431\/\">\u201eElsker og elsker ikke\u201c: DNS over HTTPS<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/461443\/\">Post-analyse: Hvad vides der om det seneste angreb p\u00e5 netv\u00e6rket af krypton\u00f8gler SKS Keyserver<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/457106\/\">Kampen mod robo-opkald i USA \u2013 hvem vinder, og hvorfor<\/a><\/noindex><\/li>\n<\/ul>\n<\/blockquote>\n<p>\n<b>2013:<\/b> Jeff Haston fra APNIC i bloggen <noindex><a rel=\"nofollow\" href=\"http:\/\/www.circleid.com\/posts\/20130724_exactly_when_is_arin_going_to_run_out_of_ipv4_addresses\/\">fortalte<\/a><\/noindex>, at IPv4-adresserne hos den amerikanske registrator ARIN ville v\u00e6re udsolgt i anden halvdel af 2014. Omtrent p\u00e5 samme tid meddelte repr\u00e6sentanter fra ARIN <noindex><a rel=\"nofollow\" href=\"https:\/\/www.arin.net\/vault\/announcements\/2013\/20130801.html\">at de kun havde to blokke tilbage \/8.<\/a><\/noindex>, som de kun havde tilbage.<\/p>\n<p><b>2015:<\/b> ARIN <noindex><a rel=\"nofollow\" href=\"https:\/\/www.theregister.co.uk\/2015\/09\/24\/arin_ipv4_interview_ipv6\/\">blev<\/a><\/noindex> den f\u00f8rste registrator, der helt havde udt\u00f8mt puljen af ledige IPv4-adresser. Alle virksomheder i denne region st\u00e5r nu i k\u00f8 og venter p\u00e5, at nogen frigiver ubenyttede IP-adresser.<\/p>\n<p><b>2017:<\/b> Om stoppet af udstedelsen af adresser\u00a0<noindex><a rel=\"nofollow\" href=\"http:\/\/www.potaroo.net\/ispcol\/2015-08\/last8.html\">udtalt<\/a><\/noindex>\u00a0ved registratoren LACNIC, der d\u00e6kker lande i Latinamerika. Nu <noindex><a rel=\"nofollow\" href=\"http:\/\/www.lacnic.net\/web\/lacnic\/agotamiento-ipv4\">kan kun de virksomheder, der aldrig tidligere har modtaget dem, erhverve en blok. I AFRINIC \u2014 der d\u00e6kker den afrikanske region \u2014 er der ogs\u00e5 indf\u00f8rt begr\u00e6nsninger for udstedelse af adresser. Deres anvendelse vurderes strengt, og der er gr\u00e6nser for det maksimale antal adresser i \u00e9n h\u00e5nd.<\/a><\/noindex> 2019:<\/p>\n<p><b>I dag har alle registratorer relativt f\u00e5 adresser tilbage. Puljerne opretholdes ved, at ubenyttede adresser periodisk returneres til cirkulation. For eksempel fandt MIT<\/b> 14 millioner IP-adresser. Mere end halvdelen af dem besluttede at videres\u00e6lge til de virksomheder, der har brug for dem. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.techspot.com\/news\/69055-mit-unload-8-million-ipv4-addresses-fund-ipv6.html\">Hvad nu<\/a><\/noindex> Der er en opfattelse af, at IPv4-adresserne<\/p>\n<h2>vil v\u00e6re udsolgt<\/h2>\n<p>\ni februar 2020. Herefter st\u00e5r internetudbydere, producenter af netv\u00e6rksudstyr og andre virksomheder <noindex><a rel=\"nofollow\" href=\"https:\/\/ipv4.potaroo.net\/\">over for valget<\/a><\/noindex> \u2014 at migrere til IPv6 eller arbejde med <noindex><a rel=\"nofollow\" href=\"https:\/\/arstechnica.com\/tech-policy\/2011\/04\/no-more-addresses-asia-pacific-region-ipv4-well-runs-dry\/\">NAT-mekanismer<\/a><\/noindex> Netv\u00e6rksadresseovers\u00e6tning (NAT) g\u00f8r det muligt at konvertere flere lokale adresser til \u00e9n ekstern. Det maksimale antal porte udg\u00f8r 65 tusinde. Teoretisk kan et tilsvarende antal lokale adresser mappes til \u00e9n offentlig adresse (hvis man ser bort fra visse begr\u00e6nsninger i specifikke implementeringer af NAT). <noindex><a rel=\"nofollow\" href=\"http:\/\/blog.vasexperts.ru\/?p=120\">Jordan Whitt<\/a><\/noindex>.<\/p>\n<p>Jordan Whitt<\/p>\n<p><img decoding=\"async\" alt=\"Tilbageblik: hvordan IPv4-adresser blev udt\u00f8mt\" src=\"\/wp-content\/uploads\/2019\/08\/18505c575eee7ff32fdfcaf989d710bd.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>\/ Unsplash \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/unsplash.com\/photos\/X5c3f2QZGXQ\">Jordan Whitt<\/a><\/noindex><\/i><\/p>\n<p>Internetudbydere kan henvende sig til specialiserede l\u00f8sninger \u2014 Carrier Grade NAT. De muligg\u00f8r centraliseret styring af abonnenternes lokale og eksterne adresser og begr\u00e6nser antallet af TCP- og UDP-porte, der er tilg\u00e6ngelige for kunderne. P\u00e5 denne m\u00e5de fordeles portene mellem brugerne mere effektivt, plus der er en beskyttelse mod DDoS-angreb.<\/p>\n<p>Blandt ulemperne ved NAT kan man fremh\u00e6ve potentielle problemer med firewalls. Alle brugersessioner g\u00e5r p\u00e5 nettet med \u00e9n offentlig IP-adresse. Det betyder, at kun \u00e9n kunde ad gangen kan arbejde med websteder, der giver adgang til tjenester via IP. Desuden kan ressourcen tro, at den bliver udsat for et DoS-angreb, og lukke adgangen for alle kunder.<\/p>\n<p>Et alternativ til NAT er overgangen til IPv6. Disse adresser vil v\u00e6re tilstr\u00e6kkelige i meget lang tid, plus det har en r\u00e6kke fordele. For eksempel har det en indbygget komponent IPSec, der krypterer enkelte datapakker.<\/p>\n<p>Indtil videre anvendes\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/w3techs.com\/technologies\/details\/ce-ipv6\/all\/all\">kun 14,3% af webstederne i hele verden.<\/a><\/noindex>\u00a0Flere faktorer relateret til migrationsomkostninger, mangel p\u00e5 bagudkompatibilitet og tekniske udfordringer ved implementering hindrer udbredelsen af protokollen.<\/p>\n<p>Dette vil vi fort\u00e6lle om n\u00e6ste gang.<\/p>\n<blockquote><p><b>Hvad vi skriver om i VAS Experts virksomhedens blog:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/seti\/vnedrenie-ipv6-faq-dlya-internet-provajderov\/\">Implementering af IPv6 \u2014 FAQ for internetudbydere<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/telekom\/protokol-ipv6-ot-teorii-k-praktike\/\">Protokollen IPv6 \u2014 fra teori til praksis<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/telekom\/ekonomiya-na-spichkax-i-neskolko-sposobov-vystrelit-sebe-v-nogu-kriticheskie-oshibki-v-stroitelstve-setej-operatorov-svyazi\/\">\u00abSkud i foden\u00bb: kritiske fejl i opbygningen af telekommunikationsnetv\u00e6rk<\/a><\/noindex><\/li>\n<\/ul>\n<\/blockquote>\n<p>Kilde: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/462435\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u0436\u0435\u0444\u0444 \u0425\u0430\u0441\u0442\u043e\u043d (Geoff Huston), \u0433\u043b\u0430\u0432\u043d\u044b\u0439 \u0438\u043d\u0436\u0435\u043d\u0435\u0440-\u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442-\u0440\u0435\u0433\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u0430 APNIC, \u0441\u043f\u0440\u043e\u0433\u043d\u043e\u0437\u0438\u0440\u043e\u0432\u0430\u043b, \u0447\u0442\u043e \u0430\u0434\u0440\u0435\u0441\u0430 IPv4 \u0437\u0430\u043a\u043e\u043d\u0447\u0430\u0442\u0441\u044f \u0432 2020 \u0433\u043e\u0434\u0443. \u0412 \u043d\u043e\u0432\u043e\u043c \u0446\u0438\u043a\u043b\u0435 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u043e\u0432 \u043c\u044b \u043e\u0441\u0432\u0435\u0436\u0438\u043c \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e \u0442\u043e\u043c, \u043a\u0430\u043a \u0438\u0441\u0442\u043e\u0449\u0430\u043b\u0438\u0441\u044c \u0430\u0434\u0440\u0435\u0441\u0430, \u0443 \u043a\u043e\u0433\u043e \u043e\u043d\u0438 \u0435\u0449\u0435 \u043e\u0441\u0442\u0430\u043b\u0438\u0441\u044c \u0438 \u043f\u043e\u0447\u0435\u043c\u0443 \u0442\u0430\u043a \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u043e\u0441\u044c. \/ Unsplash \/ Lo\u00efc Mermilliod \u041f\u043e\u0447\u0435\u043c\u0443 \u043a\u043e\u043d\u0447\u0430\u044e\u0442\u0441\u044f \u0430\u0434\u0440\u0435\u0441\u0430 \u041f\u0440\u0435\u0436\u0434\u0435 \u0447\u0435\u043c \u043f\u0435\u0440\u0435\u0439\u0442\u0438 \u043a \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0443 \u043e \u0442\u043e\u043c, \u043a\u0430\u043a \u00ab\u0432\u044b\u0441\u044b\u0445\u0430\u043b\u00bb \u043f\u0443\u043b [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27613,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-36854","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u0436\u0435\u0444\u0444 \u0425\u0430\u0441\u0442\u043e\u043d (Geoff Huston), 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