{"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\/sk\/blog\/news\/pochti-polovina-trafika-na-kornevye-dns-servery-vyzvana-aktivnostyu-chromium","title":{"rendered":"Takmer polovica prev\u00e1dzky na hlavn\u00fdch DNS serveroch je sp\u00f4soben\u00e1 \u010dinnos\u0165ou Chromium","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Registr\u00e1tor APNIC, zodpovedn\u00fd za distrib\u00faciu IP adries v \u00c1zio-Tichomorskej oblasti, publikoval<\/a><\/noindex> v\u00fdsledky anal\u00fdzy distrib\u00facie prev\u00e1dzky na jednom z hlavn\u00fdch DNS serverov a.root-servers.net. 45,80 % po\u017eiadaviek na hlavn\u00fd server sa uk\u00e1zalo ako s\u00favisiace s kontrolami vykonan\u00fdmi prehliada\u010dmi na b\u00e1ze motora Chromium. Takmer polovica zdrojov hlavn\u00fdch DNS serverov sa preto spotrebuje na vykon\u00e1vanie diagnostick\u00fdch kontrol Chromium, a nie na spracovanie po\u017eiadaviek od DNS serverov pri ur\u010dovan\u00ed hlavn\u00fdch z\u00f3n. S oh\u013eadom na to, \u017ee Chrome zaber\u00e1 70 % trhu webov\u00fdch prehliada\u010dov, t\u00e1to diagnostick\u00e1 aktivita vedie k odoslaniu pribli\u017ene 60 mili\u00e1rd po\u017eiadaviek na hlavn\u00e9 servery denne.<\/p>\n

Diagnostick\u00e9 kontroly sa v Chromiu pou\u017e\u00edvaj\u00fa na ur\u010denie, ako poskytovatelia slu\u017eieb presmerov\u00e1vaj\u00fa \u017eiadosti na neexistuj\u00face n\u00e1zvy na svoje spracovate\u013esk\u00e9 n\u00e1stroje. Tak\u00e9to syst\u00e9my zav\u00e1dzaj\u00fa niektor\u00ed poskytovatelia na smerovanie trafikov\u00e9ho toku na seba k dom\u00e9nam, ktor\u00e9 boli zad\u00e1van\u00e9 s chybou \u2014 zvy\u010dajne sa na neexistuj\u00face dom\u00e9ny zobrazuj\u00fa str\u00e1nky s varovan\u00edm o chybe, s ponukou zoznamu pravdepodobne spr\u00e1vnych n\u00e1zvov a s reklamou. T\u00fdmto sp\u00f4sobom sa v\u0161ak \u00faplne naru\u0161uje logika ur\u010dovania intranetov\u00fdch hostite\u013eov v prehliada\u010di.<\/p>\n

Pri spracovan\u00ed vyh\u013ead\u00e1vacieho dopytu zadan\u00e9ho do adresn\u00e9ho riadku, ak je zadan\u00e9 len jedno slovo bez bodiek, prehliada\u010d najprv sna\u017e\u00ed<\/a><\/noindex> ur\u010di\u0165 toto slovo v DNS, pri\u010dom predpoklad\u00e1me, \u017ee pou\u017e\u00edvate\u013e m\u00f4\u017ee ma\u0165 z\u00e1ujem o pr\u00edstup k intranetov\u00e9mu webu vo vn\u00fatornej sieti, a nie o odoslanie dopytu do vyh\u013ead\u00e1va\u010da. Ak poskytovate\u013e presmerov\u00e1va na seba dopyty na neexistuj\u00face dom\u00e9nov\u00e9 n\u00e1zvy, pou\u017e\u00edvate\u013eom vznik\u00e1 probl\u00e9m \u2014 ak\u00e9ko\u013evek vyh\u013ead\u00e1vacie dopyty z jedn\u00e9ho slova zadan\u00e9 do adresn\u00e9ho riadku sa za\u010dn\u00fa presmer\u00fava\u0165 na str\u00e1nky poskytovate\u013ea, a nie na vyh\u013ead\u00e1va\u010d.<\/p>\n

Na vyrie\u0161enie vzniknutej situ\u00e1cie v\u00fdvoj\u00e1ri Chromium pridali do prehliada\u010da \u010fal\u0161ie kontroly<\/a><\/noindex>, ktor\u00e9 v pr\u00edpade zistenia presmerovania menia logiku spracovania po\u017eiadaviek v adresnom riadku.
\nPri ka\u017edom spusten\u00ed, zmene nastaven\u00ed DNS alebo zmene IP adresy prehliada\u010d odo\u0161le tri DNS dopyty s n\u00e1hodn\u00fdmi n\u00e1zvami dom\u00e9n prvej \u00farovne, ktor\u00e9 s vysokou pravdepodobnos\u0165ou neexistuj\u00fa. N\u00e1zvy obsahuj\u00fa od 7 do 15 latinsk\u00fdch p\u00edsmen (bez bodiek) a pou\u017e\u00edvaj\u00fa sa na zistenie presmerovania neexistuj\u00facich dom\u00e9nov\u00fdch mien poskytovate\u013eom na svoj hostite\u013e. Ak bude pri spracovan\u00ed troch HTTP dopytov s n\u00e1hodn\u00fdmi n\u00e1zvami pre dve z nich z\u00edskan\u00fd presmerovanie na t\u00fa ist\u00fa str\u00e1nku, Chromium to pova\u017euje za to, \u017ee pou\u017e\u00edvate\u013e bol presmerovan\u00fd na extern\u00fa str\u00e1nku.<\/p>\n

Ako znaky na zv\u00fdraznenie aktivity Chromium z celkov\u00e9ho pr\u00fadu dopytov na kore\u0148ovom DNS serveri boli pou\u017eit\u00e9 netypick\u00e9 ve\u013ekosti dom\u00e9n prvej \u00farovne (od 7 do 15 p\u00edsmen) a faktor opakovania dopytov (men\u00e1 sa zaka\u017ed\u00fdm generovali n\u00e1hodne a neopakovali sa).
\nV logu boli najprv filtrovan\u00e9 dopyty neexistuj\u00facich dom\u00e9n (78.09 %), potom boli zv\u00fdraznen\u00e9 dopyty, ktor\u00e9 sa opakovali maxim\u00e1lne trikr\u00e1t (51.41 %), a potom boli filtrovan\u00e9 dom\u00e9ny, ktor\u00e9 obsahovali od 7 do 15 p\u00edsmen (45.80 %). Zauj\u00edmav\u00e9 je, \u017ee len 21.91 % dopytov na kore\u0148ov\u00e9 servery bolo spojen\u00fdch s identifik\u00e1ciou existuj\u00facich dom\u00e9n.<\/p>\n

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

Po\u010das v\u00fdskumu bola taktie\u017e presk\u00faman\u00e1 z\u00e1vislos\u0165 rastu za\u0165a\u017eenia na kore\u0148ov\u00fdch serveroch a.root-servers.net a j.root-servers.net od rast\u00facej popularity Chrome.<\/p>\n

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

Vo Firefoxe s\u00fa kontroly presmerovania cez DNS obmedzen\u00e9<\/a><\/noindex> ur\u010den\u00edm presmerovania na autentifika\u010dn\u00e9 str\u00e1nky (captain portal) a boli implementovan\u00e9<\/a><\/noindex> s pou\u017e\u00edvan\u00edm<\/a><\/noindex> pevn\u00e9ho subdom\u00e9ny \u201edetectportal.firefox.com\u201c, bez dopytu po dom\u00e9nach najvy\u0161\u0161ej \u00farovne. Tak\u00e9to spr\u00e1vanie nevytv\u00e1ra dodato\u010dn\u00e9 za\u0165a\u017eenie na kore\u0148ov\u00fdch DNS serveroch, ale potenci\u00e1lne m\u00f4\u017ee by\u0165 pova\u017eovan\u00fd<\/a><\/noindex> ako \u00fanik citliv\u00fdch \u00fadajov o IP adrese pou\u017e\u00edvate\u013ea (pri ka\u017edom spusten\u00ed sa za\u017eiada o str\u00e1nku \u201edetectportal.firefox.com\/success.txt\u201c). Na vypnutie kontroly v prehliada\u010di Firefox je k dispoz\u00edcii nastavenie \u201enetwork.captive-portal-service.enabled\u201c, ktor\u00e9 mo\u017eno zmeni\u0165 na str\u00e1nke \u201eabout:config\u201c.<\/p>\n

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

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

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\u043a\u043e\u0440\u043d\u0435\u0432\u043e\u043c\u0443 \u0441\u0435\u0440\u0432\u0435\u0440\u0443 \u043e\u043a\u0430\u0437\u0430\u043b\u0438\u0441\u044c \u0441\u0432\u044f\u0437\u0430\u043d\u044b \u0441 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430\u043c\u0438, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u043c\u0438 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430\u043c\u0438 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0434\u0432\u0438\u0436\u043a\u0430 Chromium. \u0422\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, \u043f\u043e\u0447\u0442\u0438 \u043f\u043e\u043b\u043e\u0432\u0438\u043d\u0430 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u043a\u043e\u0440\u043d\u0435\u0432\u044b\u0445 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0443\u0445\u043e\u0434\u0438\u0442 \u043d\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0434\u0438\u0430\u0433\u043d\u043e\u0441\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0432\u0435\u0440\u043e\u043a Chromium, \u0430 \u043d\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0443 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043e\u0442 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u043f\u0440\u0438 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":92231,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-92230","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Takmer polovica prev\u00e1dzky na 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