{"id":92230,"date":"2020-08-24T19:42:19","date_gmt":"2020-08-24T17:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/pochti-polovina-trafika-na-kornevye-dns-servery-vyzvana-aktivnostyu-chromium"},"modified":"2020-08-24T19:42:19","modified_gmt":"2020-08-24T17:42:19","slug":"pochti-polovina-trafika-na-kornevye-dns-servery-vyzvana-aktivnostyu-chromium","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/pochti-polovina-trafika-na-kornevye-dns-servery-vyzvana-aktivnostyu-chromium","title":{"rendered":"Quase metade do tr\u00e1fego nos servidores DNS raiz \u00e9 causada pela atividade do Chromium","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

O registrador APNIC, respons\u00e1vel pela distribui\u00e7\u00e3o de endere\u00e7os IP na regi\u00e3o da \u00c1sia-Pac\u00edfico, publicou<\/a><\/noindex> resultados da an\u00e1lise da distribui\u00e7\u00e3o de tr\u00e1fego em um dos servidores DNS raiz a.root-servers.net. 45,80% das consultas ao servidor raiz estavam relacionadas a verifica\u00e7\u00f5es realizadas por navegadores baseados no motor Chromium. Assim, quase metade dos recursos dos servidores DNS raiz \u00e9 gasta na execu\u00e7\u00e3o de verifica\u00e7\u00f5es diagn\u00f3sticas do Chromium, em vez de processar solicita\u00e7\u00f5es de servidores DNS ao determinar zonas raiz. Considerando que o Chrome det\u00e9m 70% do mercado de navegadores web, essa atividade diagn\u00f3stica resulta no envio de cerca de 60 bilh\u00f5es de solicita\u00e7\u00f5es aos servidores raiz por dia.<\/p>\n

As verifica\u00e7\u00f5es de diagn\u00f3stico s\u00e3o utilizadas no Chromium para identificar a aplica\u00e7\u00e3o por provedores de servi\u00e7os que redirecionam solicita\u00e7\u00f5es para nomes inexistentes em seus manipuladores. Sistemas semelhantes s\u00e3o implementados por alguns provedores para direcionar tr\u00e1fego para si a nomes de dom\u00ednio digitados incorretamente \u2014 geralmente, p\u00e1ginas de erro s\u00e3o exibidas para dom\u00ednios inexistentes, acompanhadas de avisos, sugest\u00f5es de nomes possivelmente corretos e publicidade. Tal atividade destr\u00f3i completamente a l\u00f3gica de identifica\u00e7\u00e3o de hosts intranet no navegador.<\/p>\n

Ao processar uma consulta de pesquisa digitada na barra de endere\u00e7os, se \u00e9 inserida apenas uma palavra sem pontos, o navegador inicialmente tenta<\/a><\/noindex> determinar esta palavra no DNS, assumindo que o usu\u00e1rio pode estar tentando acessar um site intranet em uma rede interna, em vez de enviar uma solicita\u00e7\u00e3o para um motor de busca. Se o provedor redireciona as solicita\u00e7\u00f5es para nomes de dom\u00ednio inexistentes, os usu\u00e1rios enfrentam um problema \u2014 quaisquer buscas de uma palavra, digitadas na barra de endere\u00e7os, come\u00e7am a ser redirecionadas para p\u00e1ginas do provedor, em vez de serem encaminhadas para o motor de busca.<\/p>\n

Para resolver o problema surgido, os desenvolvedores do Chromium adicionaram ao navegador verifica\u00e7\u00f5es adicionais<\/a><\/noindex>, que, ao detectar redirecionamentos, alteram a l\u00f3gica de processamento de solicita\u00e7\u00f5es na barra de endere\u00e7os.
\nA cada rein\u00edcio, altera\u00e7\u00e3o nas configura\u00e7\u00f5es de DNS ou troca de endere\u00e7o IP, o navegador envia tr\u00eas consultas DNS com nomes de dom\u00ednio de primeiro n\u00edvel aleat\u00f3rios, que provavelmente n\u00e3o existem. Os nomes incluem entre 7 e 15 letras latinas (sem pontos) e s\u00e3o utilizados para identificar o redirecionamento de nomes de dom\u00ednio inexistentes pelo provedor para seu pr\u00f3prio host. Se, durante o processamento das tr\u00eas solicita\u00e7\u00f5es HTTP com nomes aleat\u00f3rios, duas resultarem em redirecionamento para a mesma p\u00e1gina, o Chromium considera que o usu\u00e1rio foi redirecionado para uma p\u00e1gina externa.<\/p>\n

Para destacar a atividade do Chromium do fluxo geral de solicita\u00e7\u00f5es no servidor DNS raiz, foram utilizados tamanhos n\u00e3o t\u00edpicos de dom\u00ednio de primeiro n\u00edvel (de 7 a 15 letras) e o fator de repeti\u00e7\u00e3o das solicita\u00e7\u00f5es (os nomes eram gerados aleatoriamente a cada vez e n\u00e3o se repetiam).
\nNo registro, inicialmente foram filtradas as solicita\u00e7\u00f5es de dom\u00ednios inexistentes (78,09%), depois foram selecionadas as solicita\u00e7\u00f5es que se repetiram no m\u00e1ximo tr\u00eas vezes (51,41%), e em seguida filtrados os dom\u00ednios que inclu\u00edam entre 7 e 15 letras (45,80%). Curiosamente, apenas 21,91% das solicita\u00e7\u00f5es aos servidores raiz estavam relacionadas \u00e0 determina\u00e7\u00e3o de dom\u00ednios existentes.<\/p>\n

\"Quase<\/a><\/noindex><\/center><\/p>\n

Durante a pesquisa, tamb\u00e9m foi analisada a rela\u00e7\u00e3o entre o aumento da carga nos servidores raiz a.root-servers.net e j.root-servers.net e o crescimento da popularidade do Chrome.<\/p>\n

\"Quase<\/a><\/noindex><\/center><\/p>\n

No Firefox, as verifica\u00e7\u00f5es de redirecionamento atrav\u00e9s do DNS s\u00e3o limitadas<\/a><\/noindex> \u00e0 determina\u00e7\u00e3o de redirecionamento para p\u00e1ginas de autentica\u00e7\u00e3o (captive portal) e implementados<\/a><\/noindex> com ao uso<\/a><\/noindex> subdom\u00ednio fixo \"detectportal.firefox.com\", sem solicitar nomes de dom\u00ednio de n\u00edvel superior. Esse comportamento n\u00e3o cria carga adicional nos servidores DNS raiz, mas potencialmente pode ser considerado<\/a><\/noindex> resultar em vazamento de dados confidenciais sobre o endere\u00e7o IP do usu\u00e1rio (a cada inicializa\u00e7\u00e3o, a p\u00e1gina \"detectportal.firefox.com\/success.txt\" \u00e9 solicitada). Para desativar a verifica\u00e7\u00e3o no Firefox, existe uma configura\u00e7\u00e3o \"network.captive-portal-service.enabled\", que pode ser alterada na p\u00e1gina \"about:config\".<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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