{"id":32934,"date":"2026-03-13T17:14:14","date_gmt":"2026-03-13T17:14:14","guid":{"rendered":"https:\/\/blog.lacnic.net\/?p=32934"},"modified":"2026-03-16T18:32:25","modified_gmt":"2026-03-16T18:32:25","slug":"fragmentacao-ipv6","status":"publish","type":"post","link":"https:\/\/blog.lacnic.net\/pt-br\/fragmentacao-ipv6\/","title":{"rendered":"Como evitar a fragmenta\u00e7\u00e3o do espa\u00e7o de nomes em ambientes IPv4\/IPv6"},"content":{"rendered":"\n<p>Escrito por <a href=\"https:\/\/blog.lacnic.net\/pt-br\/autor\/hugo-salgado\/\">Hugo Salgado<\/a> e <a href=\"https:\/\/blog.lacnic.net\/pt-br\/autor\/alejandro-acosta\/\">Alejandro Acosta<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introdu\u00e7\u00e3o<\/h2>\n\n\n\n<p>Apesar de o protocolo IPv6 existir h\u00e1 d\u00e9cadas, a Internet ainda \u00e9 um ecossistema h\u00edbrido em que coexistem redes s\u00f3 IPv4, s\u00f3 IPv6 e pilha dupla (dual-stack). Essa coexist\u00eancia deu origem a um fen\u00f4meno cr\u00edtico, por\u00e9m frequentemente ignorado: a fragmenta\u00e7\u00e3o do espa\u00e7o de nomes (Name Space Fragmentation), uma barreira t\u00e9cnica que pode tornar partes da rede invis\u00edveis para determinados usu\u00e1rios.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">O que \u00e9 a fragmenta\u00e7\u00e3o DNS (Name Space Fragmentation)?<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"562\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig1-evitando-la-fragmentacion-resolucion-dns-pt-1024x562.png\" alt=\"\" class=\"wp-image-32980\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig1-evitando-la-fragmentacion-resolucion-dns-pt-1024x562.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig1-evitando-la-fragmentacion-resolucion-dns-pt-300x165.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig1-evitando-la-fragmentacion-resolucion-dns-pt-601x330.png 601w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig1-evitando-la-fragmentacion-resolucion-dns-pt-768x421.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig1-evitando-la-fragmentacion-resolucion-dns-pt.png 1316w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>A fragmenta\u00e7\u00e3o do espa\u00e7o de nomes (Name Space Fragmentation) acontece quando um resolvedor de DNS n\u00e3o consegue concluir o processo de resolu\u00e7\u00e3o porque os servidores autoritativos de uma zona s\u00f3 podem ser acessados \u200b\u200bpor meio de uma fam\u00edlia de endere\u00e7os IP (IPv4 ou IPv6) que o resolvedor n\u00e3o suporta.<\/p>\n\n\n\n<p style=\"\n    padding: 0;\n    margin: 0;\n\"> <\/p><p style=\"\n    padding: 0;\n    margin: 0;\n\"> <\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Motivos principais da fragmenta\u00e7\u00e3o<\/strong><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Erros de configura\u00e7\u00e3o (Misconfigurations): alguns erros t\u00e9cnicos podem interromper a cadeia de delega\u00e7\u00e3o para uma fam\u00edlia de endere\u00e7os espec\u00edfica. Alguns exemplos incluem a falta de registros A ou AAAA para os nomes dos servidores (NS), ou a aus\u00eancia de registros <em>glue<\/em> necess\u00e1rios na zona do pai quando o servidor NS est\u00e1 dentro do mesmo dom\u00ednio.<\/li>\n\n\n\n<li>Condi\u00e7\u00f5es da rede: determinados problemas de rede, como a perda de pacotes que excedem a MTU do caminho (PMTU) ou falhas na fragmenta\u00e7\u00e3o de pacotes IP (especialmente em grandes respostas de DNSSEC), podem impedir que o resolvedor receba a informa\u00e7\u00e3o, contribuindo para a fragmenta\u00e7\u00e3o do espa\u00e7o de nomes.<\/li>\n\n\n\n<li>Fragmenta\u00e7\u00e3o intencional: isso acontece quando um operador decide conscientemente n\u00e3o implementar IPv4 ou IPv6 em uma parte da cadeia de resolu\u00e7\u00e3o. Por exemplo, embora a ado\u00e7\u00e3o do IPv6 esteja crescendo, ainda existem muitas \u00e1reas que dependem exclusivamente do IPv4.<\/li>\n\n\n\n<li>N\u00e3o dar suporte TCP: conforme estabelecido no RFC9210, um servidor autoritativo <strong>deve<\/strong> dar suporte usando o protocolo TCP, al\u00e9m do UDP comum. Isso permite que qualquer interrup\u00e7\u00e3o causada por uma resposta muito grande que provoca interrup\u00e7\u00f5es de MTU seja atendida usando TCP.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Como evit\u00e1-la<\/strong><\/h2>\n\n\n\n<p>Para manter a continuidade do espa\u00e7o de nomes, as fontes recomendam o uso de pol\u00edticas administrativas que garantam que cada zona seja atendida por pelo menos <strong>dois<\/strong> servidores autoritativos acess\u00edveis por IPv4 e tamb\u00e9m por pelo menos <strong>dois<\/strong> por IPv6. Recomenda-se tamb\u00e9m que os resolvedores recursivos sejam preferencialmente de pilha dupla para garantir que possam consultar qualquer servidor, independentemente do seu protocolo.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"506\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig2-evitando-la-fragmentacion-resolucion-dns-pt-1024x506.png\" alt=\"\" class=\"wp-image-32983\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig2-evitando-la-fragmentacion-resolucion-dns-pt-1024x506.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig2-evitando-la-fragmentacion-resolucion-dns-pt-300x148.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig2-evitando-la-fragmentacion-resolucion-dns-pt-668x330.png 668w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig2-evitando-la-fragmentacion-resolucion-dns-pt-768x379.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig2-evitando-la-fragmentacion-resolucion-dns-pt.png 1502w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Resumo de mudan\u00e7as<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"505\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig3-evitando-la-fragmentacion-resolucion-dns-pt-1024x505.jpg\" alt=\"\" class=\"wp-image-32986\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig3-evitando-la-fragmentacion-resolucion-dns-pt-1024x505.jpg 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig3-evitando-la-fragmentacion-resolucion-dns-pt-300x148.jpg 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig3-evitando-la-fragmentacion-resolucion-dns-pt-669x330.jpg 669w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig3-evitando-la-fragmentacion-resolucion-dns-pt-768x379.jpg 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig3-evitando-la-fragmentacion-resolucion-dns-pt.jpg 1330w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1402\" height=\"748\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig4-evitando-la-fragmentacion-resolucion-dns-pt.png\" alt=\"\" class=\"wp-image-32989\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig4-evitando-la-fragmentacion-resolucion-dns-pt.png 1402w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig4-evitando-la-fragmentacion-resolucion-dns-pt-300x160.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig4-evitando-la-fragmentacion-resolucion-dns-pt-1024x546.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig4-evitando-la-fragmentacion-resolucion-dns-pt-619x330.png 619w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/03\/fig4-evitando-la-fragmentacion-resolucion-dns-pt-768x410.png 768w\" sizes=\"(max-width: 1402px) 100vw, 1402px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Conclus\u00f5es<\/h2>\n\n\n\n<p>A fragmenta\u00e7\u00e3o do espa\u00e7o de nomes \u00e9 um sintoma de uma transi\u00e7\u00e3o incompleta para o IPv6. A solu\u00e7\u00e3o mais robusta e flex\u00edvel n\u00e3o \u00e9 depender de tradutores intermedi\u00e1rios, mas garantir que os dados do DNS sejam nativamente acess\u00edveis em ambos os protocolos. Somente por meio de uma configura\u00e7\u00e3o rigorosa de pilha dupla e uma valida\u00e7\u00e3o cuidadosa das zonas podemos garantir que o Sistema de Nomes de Dom\u00ednio (DNS) continue sendo a espinha dorsal unificada da Internet.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Refer\u00eancias:<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.ietf.org\/archive\/id\/draft-ietf-dnsop-3901bis-17.txt\">https:\/\/www.ietf.org\/archive\/id\/draft-ietf-dnsop-3901bis-17.txt<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Escrito por Hugo Salgado e Alejandro Acosta Introdu\u00e7\u00e3o Apesar de o protocolo IPv6 existir h\u00e1 d\u00e9cadas, a Internet ainda \u00e9 um ecossistema h\u00edbrido em que coexistem redes s\u00f3 IPv4, s\u00f3 IPv6 e pilha dupla (dual-stack). Essa coexist\u00eancia deu origem a um fen\u00f4meno cr\u00edtico, por\u00e9m frequentemente ignorado: a fragmenta\u00e7\u00e3o do espa\u00e7o de nomes (Name Space Fragmentation), [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":32929,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[532],"tags":[1305],"archivo":[1346,1452],"taxonomy-authors":[1247,1238],"tipo_autor":[],"class_list":["post-32934","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ipv6","tag-ipv6","archivo-edicoes-anteriores","archivo-destaques-2023","taxonomy-authors-alejandro-acosta-pt-br","taxonomy-authors-hugo-salgado-pt-br"],"acf":{"author":"","related_notes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LACNIC Blog | Como evitar a fragmenta\u00e7\u00e3o do espa\u00e7o de nomes em ambientes IPv4\/IPv6<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.lacnic.net\/pt-br\/fragmentacao-ipv6\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LACNIC Blog | Como evitar a fragmenta\u00e7\u00e3o do espa\u00e7o de nomes em ambientes IPv4\/IPv6\" \/>\n<meta property=\"og:description\" content=\"Escrito por Hugo Salgado e Alejandro Acosta Introdu\u00e7\u00e3o Apesar de o protocolo IPv6 existir h\u00e1 d\u00e9cadas, a Internet ainda \u00e9 um ecossistema h\u00edbrido em que coexistem redes s\u00f3 IPv4, s\u00f3 IPv6 e pilha dupla (dual-stack). 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