{"id":35641,"date":"2019-10-31T22:05:29","date_gmt":"2019-10-31T19:05:29","guid":{"rendered":"https:\/\/prohoster.info\/blog\/utechka-bgp-marshrutov-privela-k-massovomu-narusheniyu-svyaznosti-v-internete\/"},"modified":"2019-10-31T22:05:29","modified_gmt":"2019-10-31T19:05:29","slug":"utechka-bgp-marshrutov-privela-k-massovomu-narusheniyu-svyaznosti-v-internete","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/utechka-bgp-marshrutov-privela-k-massovomu-narusheniyu-svyaznosti-v-internete","title":{"rendered":"Wycieki tras BGP doprowadzi\u0142y do masowych zak\u0142\u00f3ce\u0144 w \u0142\u0105czno\u015bci w internecie","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Firma Cloudflare <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.cloudflare.com\/how-verizon-and-a-bgp-optimizer-knocked-large-parts-of-the-internet-offline-today\/\">opublikowa\u0142a<\/a><\/noindex> raport z wczorajszego incydentu, w wyniku kt\u00f3rego przez <noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/bgpmon\/status\/1143149817473847296\">trzy godziny<\/a><\/noindex> od 13:34 do 16:26 (MSK) wyst\u0119powa\u0142y problemy z dost\u0119pem do wielu zasob\u00f3w w globalnej sieci, w tym infrastruktury Cloudflare, Facebooka, Akamai, Apple, Linode i Amazon AWS. Problemy w infrastrukturze Cloudflare, kt\u00f3ra dostarcza CDN dla 16 mln stron, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.cloudflarestatus.com\/incidents\/46z55mdhg0t5\">odnotowano<\/a><\/noindex> od 14:02 do 16:02 (MSK). Wed\u0142ug szacunk\u00f3w Cloudflare w trakcie awarii zanotowano utrat\u0119 oko\u0142o 15% globalnego ruchu. <\/p>\n<p>Problem wyst\u0119powa\u0142 <noindex><a rel=\"nofollow\" href=\"https:\/\/mailman.nanog.org\/pipermail\/nanog\/2019-June\/101590.html\">jest spowodowany<\/a><\/noindex> wyciekiem tras przez BGP, w wyniku kt\u00f3rego oko\u0142o 20 tys. prefiks\u00f3w dla 2400 sieci zosta\u0142o nieprawid\u0142owo przekierowanych. \u0179r\u00f3d\u0142em wycieku by\u0142 dostawca DQE Communications, kt\u00f3ry u\u017cywa\u0142 oprogramowania <noindex><a rel=\"nofollow\" href=\"https:\/\/www.noction.com\/intelligent_routing_platform\/traffic-routing-optimization\">BGP Optimizer<\/a><\/noindex> do optymalizacji routingu. BGP Optimizer dzieli prefiksy IP na mniejsze, na przyk\u0142ad dzieli 104.20.0.0\/20 na 104.20.0.0\/21 i 104.20.8.0\/21, a w konsekwencji DQE Communications posiada\u0142 po swojej stronie du\u017c\u0105 liczb\u0119 specyficznych tras, kt\u00f3re nadpisywa\u0142y bardziej og\u00f3lne trasy (tzn. zamiast og\u00f3lnych tras do Cloudflare u\u017cywano bardziej szczeg\u00f3\u0142owych tras do konkretnych podsieci Cloudflare).<\/p>\n<p>Te konkretne trasy zosta\u0142y og\u0142oszone jednemu z klient\u00f3w (Allegheny Technologies, AS396531), kt\u00f3ry r\u00f3wnie\u017c by\u0142 pod\u0142\u0105czony przez innego dostawc\u0119. Allegheny Technologies transmitowa\u0142 otrzymane trasy innemu dostawcy tranzytowemu (Verizon, AS701). Z powodu braku odpowiedniego filtrowania og\u0142osze\u0144 BGP i ograniczenia liczby prefiks\u00f3w, Verizon przyj\u0105\u0142 to og\u0142oszenie i transmitowa\u0142 otrzymane 20 tys. prefiks\u00f3w dla reszty internetu. Nieprawid\u0142owe prefiksy z powodu swojej granularity zosta\u0142y uznane za bardziej priorytetowe, poniewa\u017c konkretny ruch ma wy\u017cszy priorytet ni\u017c og\u00f3lny. <\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/blog.cloudflare.com\/content\/images\/2019\/06\/leak2-2.png\"><img decoding=\"async\" alt=\"Wycieki tras BGP doprowadzi\u0142y do masowych zak\u0142\u00f3ce\u0144 w \u0142\u0105czno\u015bci w internecie\" src=\"\/wp-content\/uploads\/2019\/06\/7b91b949afde7526f989c00666f7fee0.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>W rezultacie ruch dla wielu du\u017cych sieci zacz\u0105\u0142 by\u0107 kierowany przez Verizon do ma\u0142ego dostawcy DQE Communications, kt\u00f3ry nie by\u0142 w stanie obs\u0142u\u017cy\u0107 nap\u0142ywaj\u0105cego strumienia, co doprowadzi\u0142o do kolapsu (efekt por\u00f3wnywalny do sytuacji, gdy cz\u0119\u015b\u0107 obci\u0105\u017conej autostrady zast\u0105piono drog\u0105 gruntow\u0105).  <\/p>\n<p>Aby zapobiec wyst\u0105pieniu podobnych incydent\u00f3w w przysz\u0142o\u015bci,<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/mailman.nanog.org\/pipermail\/nanog\/2019-June\/101589.html\">zaleca<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> U\u017cy\u0107 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=47303\">weryfikacj\u0119<\/a><\/noindex> og\u0142osze\u0144 na podstawie RPKI (BGP Origin Validation, pozwala na przyj\u0119cie og\u0142osze\u0144 tylko od w\u0142a\u015bcicieli sieci);\n<li class=\"l\"> Ograniczy\u0107 maksymaln\u0105 liczb\u0119 przyjmowanych prefiks\u00f3w dla wszystkich sesji EBGP (ustawienie maximum-prefix pomog\u0142oby odrzuci\u0107 transmisj\u0119 20 tys. prefiks\u00f3w w ramach jednej sesji);\n<li class=\"l\"> Stosowa\u0107 filtry oparte na rejestrze IRR (Internet Routing Registry, okre\u015bla AS, przez kt\u00f3re dozwolone jest trasowanie okre\u015blonych prefiks\u00f3w);\n<li class=\"l\"> U\u017cyj zalecanych ustawie\u0144 z RFC 8212 dla router\u00f3w, aby domy\u015blnie blokowa\u0107 ('default deny');\n<li class=\"l\"> Zaprzesta\u0107 nieprzemy\u015blanego u\u017cywania optymalizator\u00f3w BGP.\n<\/ul>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/blog.cloudflare.com\/content\/images\/2019\/06\/leak3-2.png\"><img decoding=\"async\" alt=\"Wycieki tras BGP doprowadzi\u0142y do masowych zak\u0142\u00f3ce\u0144 w \u0142\u0105czno\u015bci w internecie\" src=\"\/wp-content\/uploads\/2019\/06\/2b2bb1fe713ee9e87987f57920116943.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50955\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Cloudflare \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u043e\u0442\u0447\u0451\u0442 \u043e \u0432\u0447\u0435\u0440\u0430\u0448\u043d\u0435\u043c \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0435, \u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u043d\u0430 \u043f\u0440\u043e\u0442\u044f\u0436\u0435\u043d\u0438\u0438 \u0442\u0440\u0451\u0445 \u0447\u0430\u0441\u043e\u0432 \u0441 13:34 \u0434\u043e 16:26 (MSK) \u043d\u0430\u0431\u043b\u044e\u0434\u0430\u043b\u0438\u0441\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0441 \u0434\u043e\u0441\u0442\u0443\u043f\u043e\u043c \u043a\u043e \u043c\u043d\u043e\u0433\u0438\u043c \u0440\u0435\u0441\u0443\u0440\u0441\u0430\u043c \u0432 \u0433\u043b\u043e\u0431\u0430\u043b\u044c\u043d\u043e\u0439 \u0441\u0435\u0442\u0438, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u0438\u043d\u0444\u0440\u0430\u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 Cloudflare, Facebook, Akamai, Apple, Linode \u0438 Amazon AWS. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u0438\u043d\u0444\u0440\u0430\u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0435 Cloudflare, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 CDN \u0434\u043b\u044f 16 \u043c\u043b\u043d \u0441\u0430\u0439\u0442\u043e\u0432, \u043d\u0430\u0431\u043b\u044e\u0434\u0430\u043b\u0438\u0441\u044c \u0441 14:02 \u0434\u043e 16:02 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":26701,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-35641","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Cloudflare \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u043e\u0442\u0447\u0451\u0442 \u043e \u0432\u0447\u0435\u0440\u0430\u0448\u043d\u0435\u043c.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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